|19th May 2004, 09:40 AM||#22|
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.
|31st May 2004, 01:35 PM||#23|
Join Date: Oct 2002
Arrived on the 28th. Nice boards! Everything arrived intact.
Thanks for your efforts.
A poor life this if, full of care
We have no time to stand and stare.
|4th June 2004, 07:59 AM||#25|
Join Date: Oct 2003
Another round ?
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,
|6th June 2004, 04:02 AM||#28|
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.
|19th June 2004, 07:56 AM||#29|
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.
standard film resistors,
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
power supply partlist,(for dual-mono building)
ELNA standard 6800u50v cap*4
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
|19th June 2004, 08:29 PM||#30|
Join Date: Jun 2003
Location: Victoria, BC, Canada
Talk me into it :-)
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.
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