| 3886inv gainclone PCB,group buy - Click HERE for Original Thread |
| digi01 |
the 3886IGC boards detail here: 3886IGC
specifications:
:) high quality PCB,made in BEIJING CHINA.
:D double side board,the PCB size is 1.8 x 1.72 inch.
;) Caps, diameter max=20mm,2mm holes.
:cool: single channel design,2 boards for stereo amp.
:smash: $4USD per board.
:rolleyes: shipping cost is $6USD,by air to anywhere.
:D 10 sets(20 piece) is available.
can place order via mail vcgft@yahoo.com.cn
for payment,paypal is welcome.
BTW,the regulator PCB is available at the same time.
specifications:
:) high quality PCB.
:D double side board,1.8 x 1.72 inch.
;) big filter cap,diameter max=32mm,2mm holes.
:cool: 2 boards for +/- rail power.purpose for general use.
:smash: $4USD per board.
:D 10 sets(20 piece) is available.
project detail here: regulator psu.
regards
digi |
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| peranders |
You can run your show in the way you like but I recommend you to create a wiki page. It will be easier both for you and your customers to keep track of things. I think the unspoken rule is to keep things rather open when it comes to group deals. I think you have done a fine job and the board deserves to be offered to a wider audience. :nod:
Why don't you just copy the structure of this page?
http://www.diyaudio.com/wiki/index....Super+Regulator |
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| maxw |
| Saweet! I paid for 2 regulator boards:cool: |
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| KT |
All regulator boards are accounted for, and we have gone over some!
If you stop taking orders for the regulators at this point, I hope there are some extras for the overrun?
Thanks,
KT |
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| digi01 |
| quote: | Originally posted by KT
All regulator boards are accounted for, and we have gone over some!
If you stop taking orders for the regulators at this point, I hope there are some extras for the overrun?
Thanks,
KT |
Really,it seems the design in general use is more popular:D
OK,then I will supply some extras for the overrun.
I will accept order from today till October 10.
regards |
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| JoeBob |
| Quick question, these boards only do one rail, correct? For a dual mono with + and - rails one would need 4, right? |
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| digi01 |
Yes,regulator board is single rail design.for dual mono need 4 pieces PCB.
Please wait for a moment,I am drawing a regulator hook method. |
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| digi01 |
;)
oh,finished.
digi |
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| digi01 |
here are 3886inv gianclone partlist.
:)3886igc,1 PCB parts:
1000uf/50v *2
220k 1/2w *1 (gain setting)
10k 1/2w *1 (gain setting)
20k 1/4w *1 (mute)
LM3886 *1
0.1 , 5w *1 (option,output)
220k trim *1 (option,dc offset)
heat sink,screw,hook wires.
Regulator +/-rail,2 PCBs parts:
diode ,mur860 *8
1n4004 *2
LM338 *2
100n film cap *2
6800uf/50v *2
10uf/50v *2
100uf/50v *2
120 ohm 1/4w *2
2.2k 1/4w *2 (or 2.2K trim,output voltage adjust)
heat sink,screw,hook wires. |
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| digi01 |
Here's the list of 3886INV and Regulator board groupbuyers:
digi01 China inv*4,regulator*4
tschrama Netherlands inv*4,regulator*4
Max Williams New Zealand inv*0,regulator*2
GaryB USA inv*0,regulator*4
KT USA inv*0,regulator*8
moving_electron USA inv*4,regulator*4
BrianGT USA inv*4,regulator*8
I will accept order till October 10. |
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| digi01 |
Group Buy Close.
it is going beyond much than expected,thank everybody for everybody's participation.
I have contacted pcb house and begun to process.they need to process in 6-10 days.
All the orders will arrive by the end of October. (Approximate)
The wiki page has updated:http://www.diyaudio.com/wiki/index.php?page=3886igc
cheers
digi |
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| tschrama |
:) I received the boards today. Thank you very much Digi01! And a special thanks for the special DIY amulet ;) I will use it as a goodluck charm for difficult soldering execises ....:D
cheers,
Thijs |
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| digi01 |
Fine:D thank you for your confirmation.
good luck & best regards
digi |
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| jhead |
| Will you be doing maybe a second group buy or will your boards be available on a permenant semi-permenant availability.Seems that I missed out on your thread |
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| peranders |
digi, isn't it a good idea to write the delivery date in the wiki page? I think my idea is very good, don't you think so too? I'll guess you will avoid my emails and posts here about this very simple thing.
I recommend all of you group buy organizers to have a column for recieved payment and one for delivery. |
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| digi01 |
thank you P-A.you are always so friendship.
for jhead,I will do the second group purchase at the beginning of November.
Because the pcb house of Beijing needs certain batch and can just be processed.
digi |
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| jhead |
| Thanks for the response.I do have a question just for clarification how many boards are needed to assemble a stereo amp? |
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| digi01 |
an integrated stereo amp need 4 PCBs,2 of 3886igcPCB and 2 of regulatorPCB.
a dual mono assembled amp,need 6 PCBs,2 of 3886igcPCB and 4 of regulatorPCB. |
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| maxw |
| Got my regulator PCBs today;) :angel: |
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| mhelin |
Got my 3886 and regulator boards + the amulet (which my 5 year daughter loved so much that I have to give it her) yesterday. Thanks a lot!
ps. How's the digital volume project going, will there be a group buy also for it? |
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| digi01 |
Very good,hope your daughter is happy:)
about the digital volume,I am still perfecting it.wish it can be in more common use.Perhaps will offer kits afterwards.
digi |
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| maxw |
| quote: | Originally posted by digi01
about the digital volume,I am still perfecting it.wish it can be in more common use.Perhaps will offer kits afterwards.
digi |
I'd be very keen for a digital volume control kit/PCB :devilr: especially since www.schuro.de wont reply:(
What IC are you planning on using? |
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| roibm |
| quote: | Originally posted by maxw
especially since www.schuro.de wont reply:( |
Confirm that. I placed an order a week ago and no reply to my status inquiry email. Are they really busy or out of business? |
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| digi01 |
| quote: | Originally posted by roibm
Confirm that. I placed an order a week ago and no reply to my status inquiry email. Are they really busy or out of business? |
I plan to do several kits for people interested in digitized amplifier.the full kit is around 50 dollars.
please wait some days:) |
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| planet10 |
Boards have arrived... nice little bonus :) thanx digi.
dave |
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| moving_electron |
Boards and extra gift arrived here as well.
Thank You! |
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| motherone |
| Got my boards as well. They look great. Thanks Digi! |
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| paulb |
Digi, do you have any idea when you'll start building for the second round?
I'm just about to add 14 boards to the list. I'd rather pay once you've fixed a date for production, is that okay? |
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| digi01 |
paulb,you are welcomed:)
I have start the round 2.from today to Nov 15.Can place order via mail now.
3886IGC and others wiki page
BTW,the BLD board is available now,$3 per pcb.
digi |
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| paulb |
:$:
Thanks digi. Will you confirm the total price, or should I add it up myself?
14 LM3886s at $4US
4 BLDs at $3US
Shipping at $6US
Is this correct? |
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| Aunkst |
| Will you be posting when the shipments go out? I am looking forward to starting a new amp. |
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| paulb |
Just read your instructions, digi. I'll email you amount and information.
Paul |
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| roibm |
just a confirmation needed:
2 x 3886 boards
2 x regulator boards
shipping
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2 x 4 + 2 x 4 + 6 => $22 Am I right? |
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| digi01 |
for paulb| quote: | Thanks digi. Will you confirm the total price, or should I add it up myself?
14 LM3886s at $4US
4 BLDs at $3US
Shipping at $6US
Is this correct? |
Correct:-)You can calculate by yourself too,then confirm through the mail.shipping cost is sharing,$6 to anywhere by air.
for Aunkst| quote: | | Will you be posting when the shipments go out? I am looking forward to starting a new amp. |
All the orders will send out on Nov25.(Approximate)
I will accept orders till Nov 15,and then fall to making.the process should take 7-10days.
for roibm,
you are welcomed:)its right. |
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| roibm |
| quote: | Originally posted by digi01
for roibm,
you are welcomed:)its right. |
Paid :)
I asked you if I am right because in the past you told me once "two PCB sets ,You have to pay the shipping twice". That was strange, the reason for quiting that order(MINI ZEN Headphone Amp PCB).
Now it's much better. Thanks. |
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| Andypairo |
| quote: | Originally posted by roibm
Paid :)
I asked you if I am right because in the past you told me once "two PCB sets ,You have to pay the shipping twice". That was strange, the reason for quiting that order(MINI ZEN Headphone Amp PCB).
Now it's much better. Thanks. |
Got my boards today, nice and tiny!
Thank you Digi!
Cheers
Andrea |
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| moving_electron |
the Diode holes are a bit wide set for the OnSemi MUR860s. Not really a problem as the MUR860 legs can be bent accordingly. But it might be a good change to make it a straight fit if you were reving the board at some point.
If someone was using "regular" diodes they could always mount them a bit vertical if the hole spacing was narrower.
Nice boards though! Mine are coming along. |
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| digi01 |
thank you comments:)
you will find the space is very useful.
for example,if do the power supply of pre-amp with this set of boards,can install the international rectifiers(D37-R,Package) |
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| yutty |
| Could you set up for the third round ? |
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| digi01 |
I plan to set up the third round in the first week of December, offer with kits. anyone interested can join in;)
BTW,I am on vacation now,sorry to delay.
digi |
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| maxw |
How hot do these regulators get?
I am using two LM338 per channel in a dual mono GC.
So thats two of these for one LM3875 IC with a transformer with an output of 2x25V.
Would a piece of aluminium say 10x30x140mm be enough? |
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| wim |
Thanks for the boards Digi, they look great!!
a few questions:
What to do with the holes marked "mute, DC+, DC-?
Thanks for answering and your great work. |
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| wim |
Peranders,
Do you mean a resistance between the hole called "mute"and a pin of the LM3886?
If i dont want to use the mute, can i just ignore the hole marked "mute" ?? |
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| peranders |
NO! If you don't have the MUTE resistor the amp will be completely silent!
If you check the datasheet of LM3886, page 15, bottom right. There you have a graph over the resistor(or current) vs. attentuation. |
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| wim |
| Thanks for your help Peranders. |
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| digi01 |
| quote: | Originally posted by maxw
How hot do these regulators get?
I am using two LM338 per channel in a dual mono GC.
So thats two of these for one LM3875 IC with a transformer with an output of 2x25V.
Would a piece of aluminium say 10x30x140mm be enough? |
how many is the drop voltage of the LM338?
the heatsink that I have used is a piece of aluminium 80กม138กม40mm,an output of 2X18VDC.it is warm,can touch with finger.
in my amp,the drop voltage is 4V per regulator(the transformer is 2X18VAC,then 22VDC to the regulator chip,adjusting,then output 18VDC).
in the attached pic,the upper one is the heatsink that I am using.
thank you Peranders:) |
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| maxw |
| quote: | Originally posted by digi01
how many is the drop voltage of the LM338? |
I guess it will be like 25VAC out, rectified to 35VDC then regulated to 31V.
| quote: | Originally posted by digi01
the heatsink that I have used is a piece of aluminium 80กม138กม40mm,an output of 2X18VDC.it is warm,can touch with finger.
in my amp,the drop voltage is 4V per regulator(the transformer is 2X18VAC,then 22VDC to the regulator chip,adjusting,then output 18VDC).
in the attached pic,the upper one is the heatsink that I am using. |
Thanks. I think my aluminium will be OK considering they are only powering one channel so they will not be providing much current compared to a stereo set :) |
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| jawbreak |
| Just wanted to say I'm interested in a round 3 :) |
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| Aunkst |
| I see from the WIKI that my boards shipped on the 26th of November. How long does it take for packages to get to the USA? |
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| planet10 |
| quote: | Originally posted by Aunkst
How long does it take for packages to get to the USA? |
I think it took mine about 3 weeks to get to Canada...
dave |
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| GeWa |
Hi digi
The boards arrived today.
Nice little goodies.;)
Cheers
Walter |
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| Evilsizer |
| got all my boards today... i didint realise they were this small damn... |
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| jhead |
| Got my boards yesterday look is of high quality |
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| Vuamp2 |
| I am still waiting for my :bawling: |
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| Coulomb |
Got my boards, thanks Digi.
Anthony |
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| falcott |
Hi Digi, I got my boards today. :bigeyes: so small and so nicely made. Thanks.
Now, how tiny can I make this amp...? :cool: |
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| digi01 |
hi all,congratulations!!thanks for your confirmation.I think all parcels will arrived around the christmas day.
Hope everybody utilizes this PCB to make the smart and satisfactory amplifier.
cheers:cool: |
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| KT |
Yes, please let us know when round 3 will take place. I am interested in 4 3886 boards and perhaps 2 more regulator boards.
Thanks,
KT |
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| Coulomb |
Hello Digi, I would be interested in another 4 of your BLD boards.
Regards
Anthony |
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| digi01 |
OK,the round 3 gets under way:cool:
STUFF LIST:
- inverted 3886(standard single channel inverted LM3886 gainclone) PCB available.
- regulator power supply(single rail design,generic use)PCB available.
- BLD line driver(single channel unitary gain unbalance to balance adapter,generic use)PCB available.
HCUP,high capacitance unregulated power:
- HCUP-a(single rail design,generic use)the kit is available.
- HCUP-b(single rail design,generic use)the kit is available.
the edition is based on the article of NS AN1192,page 12.a typical unregulated bipolar power supply.the footprint of these caps is 300/400mil pins,44mm(max) diameter.
for KIT,includes PCB plus all caps.
If you would like to participate in this group buy please update this WIKI PAGE with the number of boards you wish to order and also send me a mail.
cheers!
digi |
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| Coulomb |
Hey Digi, what's the pricing on the Capacitor Boards? 4.4 CM is the max Diameter per Cap?
Regards
Antrhony |
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| digi01 |
Yes,4.4 CM is the max Diameter per Cap.
the HCUP-a is $2 per PCB board,$10 per Kit.the HCUP-b is $4 per board,$16 per Kit.
NOTICE,for bipolar power supply need a couple of this.
digi |
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| Coulomb |
| quote: | Originally posted by digi01
Yes,4.4 CM is the max Diameter per Cap.
the HCUP-a is $2 per PCB board,$10 per Kit.the HCUP-b is $4 per board,$16 per Kit.
NOTICE,for bipolar power supply need a couple of this.
digi |
Kit? Do you mean PCB and Caps? What Brand and Value.
Regards
Merry Christmas
Anthony |
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| Evilsizer |
| have the prices stayed the same for the boards digi? to make it easyier might want to post the prices on the wiki page. still haven't built mine yet... but i know i need more boards. *evil grin* |
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| digi01 |
| quote: | Originally posted by Evilsizer
have the prices stayed the same for the boards digi? to make it easyier might want to post the prices on the wiki page. still haven't built mine yet... but i know i need more boards. *evil grin* |
Yes,the price is same for igc,regulator and BLD.
thank you for your suggestion.I have modify the wiki page,the price posted. |
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| digi01 |
| quote: | Originally posted by Coulomb
Kit? Do you mean PCB and Caps? What Brand and Value.
Regards
Merry Christmas
Anthony |
HCUP-a Kit contents:
PCB board - 2
ELNA standard caps - 4,10000uf/50V
ERO bipolar caps - 2
Rectifier bridge - 2,5A200V
Connector -2
HCUP-b Kit contents:
PCB board - 2
Nippon caps - 6,6800uf/50V
ERO bipolar caps - 2
Rectifier bridge - 2,5A200V
Connector -2
the picture of the Nippon caps attached. |
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| Coulomb |
Will you make just the PCB's available Digi?
Regards
Anthony |
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| digi01 |
Yes,just PCB available is welcomed.
BTW,because the CAP boards is multi footprints design,here is another Pentium KIT available:cool:
HCUP-a Kit contents:
PCB board - 2
ELNA For audio caps - 8 ,4700uf/50V
ERO bipolar caps - 2 ,0.1uf/63V
Rectifier bridge - 2,5A200V
Connector -2
HCUP-b Kit contents:
PCB board - 2
ELNA For audio caps - 12 ,3300uf/40V
ERO bipolar caps - 2 ,0.1uf/63V
Rectifier bridge - 2,5A200V
Connector -2
enjoys |
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| Evilsizer |
since round three is up any chance of getting the bpa200 pcb you posted? cant seem to find it in the tech notes. what chip did they use for the bpa200 the 3875,3886,4780?
thanks |
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| digi01 |
| quote: | Originally posted by Evilsizer
since round three is up any chance of getting the bpa200 pcb you posted? cant seem to find it in the tech notes. what chip did they use for the bpa200 the 3875,3886,4780?
thanks |
That BPA200 layout is based on my hobby,it is a so big project of my layout experience.may be I have never process out it:clown:
I guess the chips that AN1192 article commend is LM3886. |
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| Evilsizer |
| so would it be possible to get a pcb from ya this round? sorry didnt quite understand if you meant yes or no for that question. |
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| digi01 |
| it is not available now. |
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| Coulomb |
Hello Digi, I am not sure which PCB is what! There does not seem to be any clear labeling of what PCB is HCUP-a and HCUP-b??
Regards
Anthony |
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| digi01 |
| quote: | Originally posted by Coulomb
Hello Digi, I am not sure which PCB is what! There does not seem to be any clear labeling of what PCB is HCUP-a and HCUP-b??
Regards
Anthony |
the HCUP-a board can mount 2 big caps or 4 small caps.
the HCUP-b can mount 3 big caps or 6 small caps.
the attached pic is the HCUP-a layout. |
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| Ipanema |
Hi Digi,
Since LM4780 contains two identical LM3886 chips, the board size of BPA200 will be reduced if LM4780 is used instead.
:D |
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| transducer |
Hi digi,
Are the regulator boards still available? I'd be interested in order enough for 6 channels of GCSS, so 12 regulators total. Actually for a GCSS (super symetric) would I need 24 regulators, since each channel uses 2xLM3886?
Thanks,
Ron |
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| Evilsizer |
| quote: | Originally posted by transducer
Hi digi,
Are the regulator boards still available? I'd be interested in order enough for 6 channels of GCSS, so 12 regulators total. Actually for a GCSS (super symetric) would I need 24 regulators, since each channel uses 2xLM3886?
Thanks,
Ron |
is this a PA setup or BPA? im not sure on what you mean by Super symetric. You would need two reg. boards for mono config as well as stereo. One board being for +V and the other for -V. Even though you said 6 channels what number of lm3886's are planning on using? |
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| planet10 |
| quote: | Originally posted by Evilsizer
Super symetric |
The Super Symmetric chip amp that nelson proposed has become a realised amp & a group buy for boards is pending... 2 chips per channel.
dave |
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| Evilsizer |
| quote: | Originally posted by planet10
The Super Symmetric chip amp that nelson proposed has become a realised amp & a group buy for boards is pending... 2 chips per channel.
dave |
is there a link to the thread i cant seem to find it. thanks mike |
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| digi01 |
| quote: | Originally posted by transducer
Hi digi,
Are the regulator boards still available? |
thank you for your interest,the boards still available.
P.S.
for 20++ pieces of boards,the price get descent.$3 per board.
for a mate has finished his amp basis on my boards,the price get descent.$3 per board.
thanks :)
Zang |
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