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circuitscc 4th May 2010 04:08 AM

Low Cost PCB Group Buy
Hi Folks,

I'm an electronic enthusiast who spend a lot of time building audio equipment. I found that to many diyers one of the hurdles is to get a reasonably priced dedicated pcb for their projects. Using proto boards is fine but it is clumsy, time consuming and prone to error. Very often the projects were shelved when half done. Money and time were spent without a result. I experienced the same obstacle until a pcb layout software (Eagle 5.9 full version) was bought. That is to say, I can make my own pcbs and build an equipment without much headache. Since then I have the intention to make small quantity dedicated pcbs, such as pre, power amps and active xover etc..., to share with diyers in the forum, at cost. If you come across any exciting audio circuits please let me know. I am more than happy to design a board and share with anyone interested in building one for their own. Pricing will be very reasonable. For example, a 6" x 4" FR-4 (glass fiber epoxy) double-side board should cost less than USD9.00. Shipping fee is also very inexpensive : about USD2.00 within the US and USD3.00 for Europe. Please join me and post your favorite circuits. You have no obligation to buy. My goal is to bring the fun of building audio equipment to diyers.


circuitscc 4th May 2010 09:46 AM

This is a pre-amp suggested by one member.
The values are preliminary.
Please feel free to make suggestions.

José Humberto 4th May 2010 09:48 AM

Nice and generous idea.

I´m looking for a Bridge of Zen´s pcb.
Can you help me?
Best regards

circuitscc 4th May 2010 10:02 AM

Hi Jose,

Do you mean the Bride of Zen?

If there is sufficient support or demand it will be OK.

Please post a new thread and ask how many diyers are interested in this project.


Luke 4th May 2010 11:23 AM

the preamp circuit looks interesting, what is it? What fets does it use?

José Humberto 4th May 2010 12:49 PM

Sorry, you said well. The bride of zen:
I think the support isn´t a problem, but the demand will be few. Is a nice and cheap but old project.
I need only two or three pcbs.

circuitscc 4th May 2010 02:53 PM

The preferred choice of FETs are 2SK147/2SJ369 or 2SK170/2SJ74 but they are expensive and difficult to get. Fairchild J112/J175 are much cheaper. They are suitable substitues.

I will start the board design and post it soon.

RSK 4th May 2010 03:50 PM

How about the Optimos amp by Slone. On a double sided pcb.
Anyone interested to diy the boards?


Carl_Huff 5th May 2010 03:18 AM

The OptiMos is a good choice. It sounds good and is easy to build.

xtaltech 5th May 2010 05:01 AM

After I have digested R. Slone's OptiMos it's apparent that almost all of the transistors have to be matched properly with their counter parts in order to get a good result.

In the mean time, I'm reviewing his book : Hi-Power Amp Construction Manual. I'll come back once a compromise between complexity and cost is established.

Thanks for your input.

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