New MINI ZEN Headphone Amp PCB group order...

[bzo]

Just got mine today, it took 6-7 weeks.

I agree with Lucas_G, the boards are very well made.

Thanks Digi01!

[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

[SuppersReady]

Hi digi01,

Arrived on the 28th. Nice boards! Everything arrived intact.
Thanks for your efforts.

Best regards

Paul

[digi01]

congratulations

hearty cheers

-digi

[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

[troystg]

Hi digi-

I would also like to order a set if you offer this kit again.


Thanks in advance,

Troy

[Guiness]

Just name the time and place...

[digi01]

thank you for your appreciationlately,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:

[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

[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?

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)

If you think the PCB's will make a noticeable difference, then sign me up for a set. Looking forward to your thoughts.