| digi01 |
zen headamp info,you can download my protel99se ddb file.
The boards size is 91X64(mm).The price is $4 USD per board.One amp need two piece of PCB. Use CHINA POST(ship) costs is $5 USD.
you need to email me directly to place an order. Instructions on this will be posted to this thread.
Boards, Total = 30 pieces.
My e-mail : zanghb@bjtzh dot gov dot cn |
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| digi01 |
One AMP boards,PART LIST:
------------------------------------------------------------------------
R1\R2\R3\R8=1K,1/4W
R5\R6=220 ohm,1/4W
R7=33K,1/4W
R9=220K*,1/4W
R10\R11\R12=2.2 ohm,1W
R13=100K*,1/4W
R14=180K*,1/4W
R15=470 ohm,1/4W
R18=5.6 ohm ,3W
trim R16=100K,R17=1K
C1\C3=100uf/35V,ELNA CERAFINE
C2=4.7uf/63V,ERO
C4\C5=1000uf/63v ,ELNA FOR AUDIO
C6=2200uf/50v, ELNA Standard Audio Grade
connecter, 2 pin(3 pieces)
I can offer the resistance and capacity KIT package.Including all resistance and capacity the board need.The total cost $18,shiping by CHINA POST.
Q1\Q2=IRF610,
Q3=2sc1815 |
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| thomas997 |
So how much for the board and components? 22$?
Thanks |
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| digi01 |
yes,the board and components is $22 USD.Make a stereo headamp,you need two sets of these.
NOTICE: the components is not include the transistor Q1/Q2/Q3. |
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| bzo |
| what kind of resistors are they? |
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| digi01 |
OHH,I have written a mistake.it should be the 'resistors' :dead:
There are two kinds of resistors.the small 1/4W resistors is standard metal film,the big resistors R10\R11\R12 and R18 are DALE type.
If some of your components are bigger there is enough room for modifications.
This is a experimental version,I use some different components inside.
--digi01 |
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| tortello |
All the project's details and PCB layouts of the original version can be found in the Headwize site:
link
Marcello |
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| digi01 |
Hi Marcello,Thanks for a very fine contribution.ZEN headamp is my first project of your design.Do you hope that zen is as one kit? I wish this amp can be more diyers make,just like PPA ,gilmore and such these.I do not have experience in this action, your view?
Regards-digi01 |
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| tortello |
Hello digi01, for me there is no problem at all.
If somebody will ask me again the project's PCBs, I will redirect them to this page.
Cheers
Marcello |
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| roibm |
I am interested :smash: :hot:
Anyone else from Germany interested? |
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| Lucas_G |
Hi Digi,
I have just emailed you on this address: zanghb@bjtzh.gov.cn
I would like to order 4 boards.
Maybe there are more people interested in the Netherlands?
I hope we can pay you thruogh PAYPAL.
Do you have an account there?
With kindest regards,
Lucas |
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| needtubes |
| I am considering purchasing two boards.... but am at school right now and cannot send email. Just wanted to express my interest (though I am not certain whether I can buy or not). Do you have any schematics drawn out to match your board layout? I noticed that the parts names are a little different and was wondering which ones compared to the original ones in the article. Thanks |
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| digi01 |
Thank you tortello,thanks all:)
This is my sch,I use protel's auto-route function, through sch turn into pcb file automatically.according to the actual conditions, I have revised some components(D1/D2 with 1N4148,Q3 with 2sc1815)I
Indeed,you can use my pcb make tortello's original version,do not any revise.
regards,
digi01 |
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| Lil_JV |
What software did you use to make the layout? I would like a program that has the feature of putting in the schematic and it automatically makes a layout.
Thanks,
JV. |
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| digi01 |
I use protel for that.
In fact, the circuit of AUDIO is very simple, it is not essential to use the large-scale software such as protel.Eagle or expressPCB are good choices.
Just because the pcb factory of Beijing makes PCBs only accept the file of protel form. |
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| digi01 |
| :Pawprint: Supplement ,one board partlist R4=20K |
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| digi01 |
For those who participated in the group order for the mini ZEN headphone amp kits/pcbs.I will send out the last batches of oeders this noon.Any question please have been at mail or in this order threads to get in touch me. Thank the appreciating of everybody.
-digi |
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| bzo |
| Anyone get their boards yet? |
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| Lucas_G |
| quote: | Originally posted by bzo
Anyone get their boards yet? |
Yes, I got them a couple of days ago.
They took a long time to get here from china, but they arrived in good shape.
Very well made pcb's!
Thanks Digi!
Lucas |
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| digi01 |
china post may take 2-6 weeks for goods to arrive,but in extreme cases,2 months.
Lucas_G,wish your MINI zen born soon ;)
kind regards
-digi |
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| bzo |
Just got mine today, it took 6-7 weeks.
I agree with Lucas_G, the boards are very well made.
Thanks Digi01! |
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| digi01 |
I get on to the surface shipping so slow,but it is cheap and so safe.if we use fast air post,it may take 1~2weeks to arrive.the cost is 10USD for 2PCB boards shipping.
BTW:a Hongkong diyer have finished the boards,and send me some pic show his workshop.
cheers
-digi |
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| SuppersReady |
Hi digi01,
Arrived on the 28th. Nice boards! Everything arrived intact.
Thanks for your efforts.
Best regards
Paul |
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| digi01 |
congratulations:)
hearty cheers
-digi |
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| leo van doorn |
Digi,
Is there any change that you will do another round of your boards/kits. I missed this round and as everybody is so possitive about your work I would like to buy (and build) them very much.
I would order 4 kits,
Leo |
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| rabstg |
Hi digi-
I would also like to order a set if you offer this kit again.
Thanks in advance,
Troy |
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| Guiness |
| Just name the time and place... |
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| digi01 |
thank you for your appreciation:)lately,I have received some e-mails ask for my boards.I may do another round orders.
dual mono zen headamp boards,total=60 PCBs (30 sets)
R/C kit,total=10 sets (maybe add,basis on order quantitys)
if you have other ideas,please add comment.
btw:I am considering append power supply caps and bridge diodes in R/C kits.I have find some good components.
such as ELNA standard or Nippon chemi-com 6800u50v caps.
pic view: |
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| digi01 |
The boards is available now.
dual-mono PCB boards, Total = 60 pieces(30 sets)
The price is $3.6 USD per board.building one amp need 2PCBs boards($7.2).the boards including partlist.
surface shipping costs is $5 USD.take 2-6 weeks arrive.
by air ,cost is $10 USD.2 weeks arrive.
R/C kit,total = 10 sets.
each kit can fit 2 dual-mono boards and mono power supply used.
part list-
main boards:
standard film resistors,
R1\R2\R3\R8=1K,1/4W
R4=20K
R5\R6=220 ohm,1/4W
R7=33K,1/4W
R9=220K*,1/4W
R13=100K*,1/4W
R14=180K*,1/4W
R15=470 ohm,1/4W
dale resistors,
R10\R11\R12=1 ohm,1W
R18=5.6 ohm ,3W
C1\C3=100uf/35V ,ELNA CERAFINE
C2=4.7u100vBP (For audio)
C4\C5=1000uf/63v ,ELNA FOR AUDIO
C6=2200uf/50v , ELNA Standard Audio Grade
socket,2 pins output/psu
small socket,input
power supply partlist,(for dual-mono building)
ELNA standard 6800u50v cap*4
1n4001 diode*8
25x40 holes bread board*2
pre R/C kit,the total cost is $40 USD.
surface shipping cost is $5.
by air it is $15.
you need to email me directly to place an order.
My e-mail : vcgft@yahoo dot com dot cn |
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| metalman |
Digi01,
As you know, I built a Zen headamp recently using perfboard and point to point wiring, but I was well into building it when you made the pcb/kit offering, so I decided against buying some of your boards. I have had my amp completed for a few months now, and I have been slowly tweaking it into better performance, including following a couple of your suggestions. This circuit definitely benefits from some carefully considered tweaks.
Of course, now I can't help but wonder how much benefit is achieved by using a good pcb instead of perfboard, and now that you are offereing pcb's again it has become a factor my curiosity won't let me ignore. You mentioned to me once that my amp circuit looked similar to the first version you built. So ... does the circuit on a PCB sound significantly better than with point to point wiring?:cannotbe:
For the record, the changes that I found made the biggest difference in sound quality:
1) Replace the potentiometers with fixed value resistors once you know what exact values you want.
2) Add a film bypass cap to the output electrolytics.
3) A separate P/S voltage regulator circuit for each channel made a whopping difference.
4) More bias (I'm running mine at 0.3A):devilr:
If you think the PCB's will make a noticeable difference, then sign me up for a set. Looking forward to your thoughts. |
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| Brian Donaldson |
| I may need a a pair to compair to my CCS miniA HP amp. |
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| digi01 |
Please notice:
the R/C kit not including dual-mono main amp PCB boards,only 2 bread boards for power supply parts building.
so,the all parts kit (amp boards+R/C kit) cost is $47.2 USD.
and in psu parts,it has a couple of ELNA standard 6800u50v caps for dual mono psu building,but not 4 caps.sorry for my mistakes.
for Brian Donaldson
I am very interest in compare ZEN & alpha.in fact,I am making a minia headamp now:)waiting your test result.
-digi |
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| digi01 |
for metalman
thanks for you share your circuit debug course on forums,it is cool ;)I agree with you point,the circuit definitely performances from tweaks.P2P or PCB mounting mode,can all adjust to very good performance.
supplement some improve sound quality modification idaes:
1,match R10 and R12,obtain stability DC work point.
2,use dual mono building, separate common ground.
3,choose top grade components.such as use 100uf/35v BP cap for C3.
4,adjust amp gain setting, you can check out this thread for some detail:http://www.diyaudio.com/forums/show...light=headphone
5,use battery power.or improve psu voltage,my ZEN run at 35V pre channel 200ma bias.
as Pellerano mentiond,the amplifier is quite sensitive to component quality. Q1 and Q2 are critical.IR or Motorola brand IRF610 is good.2sk214 is another choice,but need testify.
btw,you setting the bias at 0.3A.what headphone are you useing?
regards
-digi |
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| metalman |
Digi01,
I am using Grado Labs SR-225 headphones, which have a 32 ohm impedance. I am running 30V and 0.3A bias to optimize the amp power output into my headphones, 1.44W into 32ohms. This works out to 138dB max volume, which means that I should never hear it start clipping.
Thanks for the link on setting the gain. I may have to play around to see how different gain settings affect the sound.
Metalman |
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| ftjandra |
Digi01,
Have you or anyone else compared this amp to a PPA? I have a PPA right now, but am very interested in trying this one out if it is very competitive. Also, do you still have some kits left? Thanks.
--Ferdi |
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| digi01 |
| quote: | Originally posted by ftjandra
Digi01,
Have you or anyone else compared this amp to a PPA? I have a PPA right now, but am very interested in trying this one out if it is very competitive. Also, do you still have some kits left? Thanks.
--Ferdi |
the sound of ZEN is very nature,especially in grado series headphone load.I like use it enjoy the vocal and jazz music,only beautiful;)
I have 6 kit left now,you may give me a mail order it.
-digi |
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| digi01 |
| quote: | Originally posted by Brian Donaldson
I may need a a pair to compair to my CCS miniA HP amp. |
Hi Brian,your e-mail host maybe have some problem.please give me a mail:smash: |
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| digi01 |
| Brian,I still can't send you a mail.mail delivery failed:hot: |
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| Kram |
Hello,
I have just started testing my circuit after soldering all the components to Digi01s PCB.
I was aiming for a bias current of 300mA but all i seem to be able to achieve is 192mA (0.58V/3).
Here are some measurements that i took
24.8V supply
V R18 = 1.1
V r2 = 3.5
Q3 (ZTX450) B= 12.1, C = 16.8, E = 11.6
Vbe = 0.54
Q2, G = 5.2, D = 11.6, S = 0.58
Q1, G = 16.7, D = 24.1, S = 12.1
can anyone see if anything is wrong from these values?
Also I tried to set the Id(Q1)/Id(Q2) ratio the way tortello suggests on the Headwize site but cant seem to do it correctly.
Tortello's tutorial says to measure the AC contribution across R10 and R12 whilst applying a 1kHz input.
If i connect my scope probe across R10 with the probe ground at one side of R10 and probe at the other end I dont get a proper reading. If i connect the probe between Q1 source and R10 with the probe ground at ground i get a nice sine wave.
When i connect the probe across R12 I dont get any signal no matter how much i adjust R17.
Is this normal or is there something wrong.
Thanks for any help
Mark |
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| metalman |
Mark,
Lets tackle the bias issue first. Could you measure and post the voltages across R4, R16, R3 and R10. R4 and R16 will have the biggest affect on the bias current here. It may not be possible to get 300mA bias with them in the circuit. At first glance, your other numbers seem OK, but I'll check a little closer.
In my amp I had to remove them to get the bias up to 300mA, but in that case you have to add an extra capacitor in the bias circuit to maintain stability.
Start by measuring and posting those values and we'll go from there. Just so you know, I've benn pretty busy lately, so I may be a little sluggish in replying promptly.
Terry |
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| tschrama |
Any pcb boards left to buy?
greetZ,
Thijs |
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| Kram |
thanks for replying metalman
Firstly I realised that i forgot to mention in my 1st post that i am using 3.01 ohm resistors for R10, R11, R12. these are what Digi01 supplied in his kit. I know that if i use 2.2 ohm that the bias would be higher but still not high enough to reach 300mA.
The reason behind me thinking that something was wrong with the circuit was that it did not reach 300mA which is what i though it was capable of and I couldnt balance the Id of Q1 and Q2.
R4 = 1.2
R16 = 6.9
R3 = 0.05
R10 = 0.59
R16 is a variable 100k set at its maximum resistance.
Thankyou
Mark |
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| metalman |
Mark,
OK, I checked your measurements in more detail, and the good new is that your headphone amp is working exactly as it should. With the parts you have in the circuit at present, the max possible bias is what you are measuring (i.e. ~200mA). Without changin parts, it won't go any higher.
For measurements to determine the contribution of the active current source, you want to measure the AC voltage contribution across R10 and R11, and adjust until the reading across R10 is one half of the value you read across R11. Seeing no AC signal across R12 is normal. By my rough check you appear to be pretty close to the optimal adjustment as you have things set right now.
Now, although I am running amp at 300mA bias, I am doing it solely on the basis that Nelson's general statement is that more bias is better. This amp will sound really good at 200mA, and pushing it to 300mA starts to push the thermal limits of the IRF610's, affecting long-term reliability unless you have them really well heatsinked. While I notice a difference in sound quality on my amp between 200 and 300mA bais, the difference is only distinguishable on certain very well recorded pieces of music. So if you want to stop where you are, you won't be missing much if anything.
That being said, if you are determined to run at 300mA bias, there are two ways to do it. First, If you can live without having a bias adjustment (this is more or less how I have my amp set up):
1) Replace R10, 11 and 12 with 2.2ohm resistors.
2) Remove R4 and 16 from the circuit.
3) Add a capacitor of ~1nF bridging the base and collector terminals of Q3 (this is necessary to stabilize Q1/Q3).
If you want to keep the bias adjustment, simply replace R10, 11 and 12 with 2 ohm resistors. This should give you a max adjustable bias of 300mA. In this case you don't need the extra capacitor as R4/R16 stabilize the circuit.
Hope this helps you out.
Terry |
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| Kram |
Thanks for the excellent reply Terry.
I have another of these amps built on stripboard that i can experiment on so i will probably try everything you suggested to to see if it does make a bit of a difference to me.
Do you have any details on the power supply that you are using for you amp, i found your schematic for it in your thread about your zen head amp.
Does it give better sound quality than a standard PS with caps or a CRC?
thanks a lot for you help
Mark:D |
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| metalman |
Mark,
My Power supply is a single transformer, followed by a CRC filter. The output from the CRC filter splits to two voltage regulators, one for each channel, each regulator followed by another filter cap (I think around 5600uf).
What affect did that have on the sound?:
The soundstage, which was already very good, snapped into tight focus. Most people say you can't achieve this with headphones, but to me I can sense the space of the recording room with nice relief of the front to back position of the sounds. Secondly, and I think this is because of the the better soundstage retrieval, I suddenly started hearing subtle little details in recordings that I had never heard before. I should mention here that to get this also involved bypassing each of C3, 4 and 5 with a 0.1uF MultiCap. I haven't tried replacing C3,4,5 with Blackgates, but some people I have talked to say they get the same effect too.
The only downside of using my (actually Nelsons) regulation stage in the power supply is that you loose 7-8 volts, and therefore have to change some resistors values in the circuit to get everything propoerly balanced. If you find yourself wanting to do this let me know and I will help you get it sorted out.
Cheers, |
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| Kram |
Doh!
Im still not able to adjust this current balancing thingy.
This is what im doing.
set o'scope to ac, apply 1kHz to amp, place probe across either R10 or R11, output is a big mess on the screen.
another thing that i tried.
set o'scope to ac, apply 1kHz to amp, place probe at node between R10/Q1 source and the probe ground to circuit ground, result is nice sine wave, adjusting R17 does nothing.
The same thing happens with R11.
Am I doing something wrong?
Thanks again
Mark |
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| metalman |
Mark,
Sorry I didn't respond sooner, I was on vacation. I am also sorry to hear about your measurement problem. Unfortunately I don't own or use an oscilloscope myself, I rely on the good graces of some of my co-workers who do measurements for me. But I will ask them their opinion and see if I can give you some feedback.
Terry
On the other hand, maybe some of the more experienced members here might chip in ... (blatant plug for others participation) ... |
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| Kram |
Update:
I have been listening to music through the amp and it sounds quite good without being run in.
I replaced my 3.01 ohm resistors with my old 2.2 ohm ones from my old amp and now get roughly (from memory) 260mA which is high enough with the heatsinks I have.
still cant figure out that current sharing thing:smash:
Thanks
Mark |
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| digi01 |
| quote: | Originally posted by Kram
Update:
I have been listening to music through the amp and it sounds quite good without being run in.
I replaced my 3.01 ohm resistors with my old 2.2 ohm ones from my old amp and now get roughly (from memory) 260mA which is high enough with the heatsinks I have.
still cant figure out that current sharing thing:smash:
Thanks
Mark |
Well done,Kram.
congratulations:)
BTW,the 4 of 3.01ohm resistors that I supply in the kit is high quality CGW brand.R10 and R12 should be match,then you can get stable DC points.
what headphone do you using?if it is a middle Z or high Z headphone,you don't need to charge the higher current setup, even if at least 100mA bias current is advisable for the best sound quality.
enjoys
digi |
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| digi01 |
| quote: | Originally posted by tschrama
Any pcb boards left to buy?
greetZ,
Thijs |
I have some boards available,but not kit supply. |
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| motherone |
| I'm interested in boards as well.. I'm sending you a PM in just a moment =) |
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| digi01 |
hello everyone,have you finished your amp?
here is mine lately work.the amp powered by a regulator unit.
LINK1
LINK2
CHEERS!:D |
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| rabstg |
I am still trying to find an accurate parts list to order the components.
I can build it in one night and be listening the next day if I can order the correct parts. |
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| digi01 |
net block :o ~
here is my parts list:
amp unit
R1\R2\R3\R8=1K,1/4W
R5\R6=220 ohm,1/4W
R7=33K,1/4W
R9=220K,1/4W
R10\R11\R12=3.01 ohm,1W 1%
R13=100K,1/4W
R14=180K,1/4W
R15=470 ohm,1/4W
R18=5.6 ohm ,3W
C1\C3=100uf/35V,ELNA CERAFINE
C2=4.7uf/63V,elna for audio Bp
C4\C5=470uf/63v,ELNA silmic
C6=2200uf/50v, ELNA Standard Audio Grade
TRIM R16=100K,R17=1K
Q1\Q2=IRF610,
Q3=2SC1815
power unit,a regulator power supply,22VDC for 2 channel.
LINK
ZANG |
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| rabstg |
Excellent!!
I was not sure if the first list on post 2 was the final or for your prototype boards.
I will order then this week and start solddering when they arrive. :D |
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| jleaman |
| quote: | Originally posted by digi01
hello everyone,have you finished your amp?
here is mine lately work.the amp powered by a regulator unit.
LINK1
LINK2
CHEERS!:D |
Super Case work. : O ) |
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| rabstg |
Ordered these:
Item # - Description Quantity Price Total
ROA103-ELNA 100uf/35V 4 1.10 4.40
ROA474-ELNA 470uf/63V 2 4.20 8.40
NICH23-NICHICON 2200uf/50V 2 2.05 4.10
V4-1.0k-Vishay/Dale 1/2 watt metal film 1.0kohms 10 0.20 2.00
V4-221-Vishay/dale 1/2 watt metal film 221 ohms 4 0.20 0.80
V4-33.2k-Vishay/Dale V4 1/2 watt metal film 33.2kohms 2 0.20 0.40
V4-221k-Vishay/Dale V4 1/2 watt metal film 221kohms 2 0.20 0.40
V4-20.0k-Vishay/Dale 1/2 watt metal film 20.0kohms 2 0.20 0.40
V4-100k-Vishay/Dale 1/2 watt metal film 100kohms 2 0.20 0.40
V4-1.82k-Vishay/Dale V4 1/2 watt metal film 1.82kohms 2 0.20 0.40
V4-475-Vishay/Dale V4 1/2 watt metal film 475 ohms 2 0.20 0.40
22.10
Zang- I did not find an ELNA 4.7uf/63 cap at Welborne labs. You know of another place to get it and theses: Now I need Q1/2/3, R10/11/16/17 & 18. |
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| digi01 |
have you try http://www.mouser.com/ ?
Q1/2
Mouser Part #: 512-IRF610B 1: $0.460
Q3
Mouser Part #: 512-BC546B ,Cross reference match for 2sc1815
1: $0.240
R10\R11\R12
Mouser Part #: 261-1.0 1: $0.130 (no good)
4.7uf/63v
alternative
here is my board assembly photo: |
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| steenoe |
| quote: | | hello everyone,have you finished your amp? |
Just finished mine:) As it happened, I had a chassis like Tortello himself;) I fitted a heatsink in the bottom of it. It is running from a "pure breed" Zen regulator. Big caps are Black Gate's, input cap is a BC 4,7uF MKT. The sound is amazing:D I didnt use a pot for it, but runs the amp from my beloved BosoZ. I also had some rather tall feet machined for the chassis, to help the airflow around the heatsink. You can see the heatsink right underneath.
The amp is totally quiet in the headphones, with no signal. Only a little "mosfet hiss", with the volume at full throttle.
Thanks, Tortello for this fine circuit, and DIGI01 for the boards:)
Steen:cool: |
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| rabstg |
steenoe-
I love the chassis.
Couple of questions:
1. Where did you get the chassis?
2. Why the heatsinks? Was the chassis it's self not enough to cool the amps?
I hope to finish mine soon, but I have been busy on my Krell Clone, Pass Mini-A, Hypex UcD-180's and the speakers all of them will be tried / used on...
I will try to post a picture of mine shortly. I have a chassis from Par-metal that will house a remote controlled input selector and volume control from DIYCLUB.biz, Pavels "audio refiner" (line stage) circuits, and a switch to go between Zangs headphone amp and BrianGT's LM3886 GC.
Although I may NOT implement Pavels circuit and save for a purist approach preamp later. |
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| steenoe |
| quote: | | 1. Where did you get the chassis? |
I bought it from Elfa.se, the manufactorer is Teko in Italy:
http://www.teko.it/Eng/ENCLOSURES/frame.htm
The page works in frames so I couldnt link you directly:-( Its in the RF series, and called Dissipator. Check out the homepage for a local dealer.| quote: | | 2. Why the heatsinks? Was the chassis it's self not enough to cool the amps? |
Because it was easier to mount the hole thing on the bottom. I didnt try to use the amp, with only the chassis as a heatsink. I did use the sidepanels of the chassis as heatsink for the reg's though. Have a look.
Its running 290 mA. The regs are the 2 small perfboards at the rear.
Steen:cool:
BTW I dont think the chassis itself will do the heatsinking:xeye:
It runs fairly warm. |
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| steenoe |
| quote: | | I hope to finish mine soon, but I have been busy on my Krell Clone, Pass Mini-A, Hypex UcD-180's and the speakers all of them will be tried / used on... |
That situation sounds quite familiar to me:D :D Just one more thing; The pinout of Q3 that digi01 uses, isnt the same as the ZTX450 and other normally used transistors! I used MPSA18 and had to twist the legs a bit:)
Check the designation on the board and compare it to whatever transistor you will be using:)
Steen:cool: |
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| r_jik45 |
Hi all,
digi01,
Is a single power supply fine for two amplifiers?
Because, as others, I planned to make one per channel :confused: |
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| digi01 |
hi steenoe,
Really nice building!what headphone are you using now?have you compare the difference of regulator psu and unregulator psu?
For the heatsink,I agree with steenoe.mine is a 3mm thickness,A4 paper size aluminium board for the chassis&heatsink.
to r_jik45,
I have run the Zen headamp with a couple of 35V unregulate power supply for dual mono,and a single 22V regulate psu for 2channel.I think the regulate psu make a preferable bass.
Z. |
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| r_jik45 |
digi01,
Thanks for your reply. |
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| steenoe |
| quote: | | what headphone are you using now?have you compare the difference of regulator psu and unregulator psu? |
I have a pair of Beyerdynamics DT880. I didnt compare the reg psu to an unregulated, since I had this regulated supply made allready. Just had to remove one Zener each side to get 24V.
The amp sounds fantastic. I didnt do any mods to make it fit the Beyer's. They are higher impedance than Grados, but that doesnt seem to be a big concern.
Steen:) |
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| tortello |
The amplifier is quite universal, even if some "faces" of its sounds were "cutted" to obtain an happy marriage with Grados.
Which are quite demanding towards electronics...
Marcello |
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| steenoe |
Hi Tortello:)
Thanks a lot for this fine piece of work;) It sounds just great.| quote: | | The amplifier is quite universal |
Yep, I guess you are right about that:) The Beyer's never sounded better.
Steen:cool: |
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| tortello |
| quote: | | Yep, I guess you are right about that The Beyer's never sounded better |
Hello Steenoe
thank you for your nice remarks.
Today about 200 amplifiers have been built, at least from the feedback I received straightly from the builders.
Sooner or later there will be an improved version of this amplifier, as soon as time will permit to develop some ideas.
Anyway... happy that you found it pleasant!
All the best from Italy
Marcello |
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| steenoe |
| quote: | | Sooner or later there will be an improved version of this amplifier, as soon as time will permit to develop some ideas. |
Tortello, I am amazed allready by this amp:D If you have some improvements, up your sleeve, that would be even greater;) Now that I started etching my own boards, I will jump right in, for sure:D If you post those nice pdf's again;)
Steen:cool: |
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| tortello |
Hello Steen,
by now only ideas, and a quick simulation.
As for the sound... who knows?
Thank anyway you for your kind words...
All the best
Marcello |
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| digi01 |
to keypunch,
I have try to reply your mail,as though having some odd SPAM from Windows infected machinies filling your eMail box.
I have some boards available.at the same time I am going to make a pure balanced layout.
http://www.diyaudio.com/forums/show...6657#post416657
for the shipping,yes it is still apply.$6USD,by air to
Canada or anywhere.
to tortello,
what do you think the balanced layout?thank you.
:)
Z. |
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| A'af |
According to Digi01, i can provide this board again as a group buy, the board and/or kit, we are (me and him) plan to coperate to make this "on" again.
As usual, quantity in group buy is a matter ;)
So if anybody here interested, mail me and we look and count is ok or no to proceed.
all the best,
a'af |
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| Cabdriver |
| bump, there must be more people interested, right? |
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| motherone |
| I'd be interested in 4-8 boards probably, depending on price. |
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| A'af |
The price and the shipping cost is same as in first post, the board is US$ 4 (needs 2 for stereo) also US$ 5 for shipping, thanks.
but as i mentioned before, i start when the amounts is ok ;)
if you order 8 pieces, till now only just 10 boards :(
Hope 20 pieces and i will run it!! :) |
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| rebojorge |
| i would be interested in 4 boards.... to make 2 stereo amps.... 6 to go |
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| tschrama |
You can count me in for 4 to 6 PCBs....
grzz,
Thijs |
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| motherone |
| If the boards are $4, I'll commit to 8 of them. |
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| alfiax |
| I would be interested in four of these. |
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| motherone |
| Actually, up me to 12 boards. I'm going to send a few to some friends. You should be good to go forward now with my increase and afiax's order! |
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| digi01 |
motherone
for the mini zen headphone amp.I have stopped the old version.
I have a updated version available.it is a combo design including power supply.
for 12PCBs order(stereo board),the total cost is $66USD by air shipping.
kind rgds
Zang |
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| rabstg |
| quote: | Originally posted by digi01
......I have a updated version available.it is a combo design including power supply...............
kind rgds
Zang |
New version? May we see?
I'm in for 2 more.. :D
Edit:
Hows the turtle? |
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| A'af |
| according to amount, i can run to order now, but seems the original designer have the new version, so pls mail me offline if you want to order, thanks. |
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| motherone |
| quote: | Originally posted by digi01
motherone
for the mini zen headphone amp.I have stopped the old version.
I have a updated version available.it is a combo design including power supply.
for 12PCBs order(stereo board),the total cost is $66USD by air shipping.
kind rgds
Zang |
Zang,
So the new version is stereo + power supply on a single board?
Thanks,
Mike |
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| digi01 |
yes,it is a all in one board.PCB size is 100mm x 125mm approx.
Zang |
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| motherone |
| Sounds cool. What's the price per PCB? |
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| digi01 |
to motherone,
$6 per pcb.
for 10++ order,$5 per board.
to rabstg,
the turtle is ok:) thank you.
the new version will available soon.
Zang |
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| paulb |
Zang,
(please forgive me if you've answered this many times before - I've been away from the site for a while)
Have you got a list of board inventory you have for sale? Or do you sell everything that you build?
Your line driver boards are helping distribute music around our workplace via CAT-5 cable.
Cheers
Paul |
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| motherone |
I'll go in for 6 boards based on that pricing.
Thanks! |
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| digi01 |
Paul,
first,I am very happy to hear the BLD are in good use.
I have lots of pcb design,some for customize order,some for diy fun.I am going to post a available list of board inventory.
For me,I do like p2p assembly more.90% of my build were implemented by hand & p2p.
Zang |
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| motherone |
That'll be cool to see, Zang. I have quite a few of your boards already (LM3886, LM338 regulator boards, DRV134's, etc.), and appreciate all your DIY-friendly contributions!
Mike |
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| paulb |
| quote: | Originally posted by digi01
For me,I do like p2p assembly more.90% of my build were implemented by hand & p2p.
Zang |
I know, I've seen your boards at headwize. Very nice. |
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| motherone |
| Will this GB be moving forward? |
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| digi01 |
ya,preorder are welcome.
the 4 round GB is starting.I will accept order from today to this month end.
Z |
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| jleaman |
| quote: | Originally posted by digi01
ya,preorder are welcome.
the 4 round GB is starting.I will accept order from today to this month end.
Z |
Digi01 I emailed you about something and didn't get a reply did you get my email ? It was about the digital Pot. |
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| motherone |
Digi,
Is there someplace that the GB is being coordinated at?
Thanks,
Mike |
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| Cabdriver |
yeah, are we supposed to order directly from you digi01? not from A'af?
thnx |
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| digi01 |
| quote: | Originally posted by jleaman
Digi01 I emailed you about something and didn't get a reply did you get my email ? It was about the digital Pot. |
can you send again?I am sorry for missing your e-mail.my mail box has 50+ mails per day.sorry.
| quote: | Originally posted by motherone
Digi,
Is there someplace that the GB is being coordinated at?
Thanks,
Mike |
drop me a mail is ok.I use a new e-mail for diy stuffs order.
mail to: designer.zang@gmail.com
thanks!
| quote: | Originally posted by Cabdriver
yeah, are we supposed to order directly from you digi01? not from A'af?
thnx |
for new version,from me.
for old version,from A'af:)
thank you for your interest,
Zang |
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