redesign of leach amp pcb for integrated TO-247 output devices - Page 2 - diyAudio
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Old 1st July 2002, 08:35 AM   #11
BrianGT is offline BrianGT  United States
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Default Re: does it have to be two-layer board?

Quote:
Originally posted by EJ
It will be difficult for most diyers to make the board by themselves if it is not single-layer. I think one of reasons why Leach Amp is so popular is that the board is quite easy to make.
I agree with this, but keeping the design single sided would have limited the design quite a bit. By using double sided, placement can be more controlled, jumper wires eliminated and shorter traces can be used. I have the board currently done, so that I can send the gerber files off to any board manufacturer and have the double sided boards made with a nice silkscreen. If there is enough interest, I will do a large order for other people on this forum to join in. It doesn't cost too much for the boards, if a lot of people join in.

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Old 1st July 2002, 08:43 AM   #12
Jean is offline Jean  United States
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I am in .
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Old 1st July 2002, 08:49 AM   #13
BrianGT is offline BrianGT  United States
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I will post a new thread when I get a price quote and am ready to order.

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Old 1st July 2002, 02:36 PM   #14
mlloyd1 is offline mlloyd1  United States
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Thumbs up nice layout! what if ....

Brian:
Your layout really looks good! What's the possibility of adding patterns to use the 2SA1349/2SC3381 monolithic duals in their special wierd package for the dual diff stages in addition to the usual TO-92 package devices currently being used and adding patterns for different voltage gain driver devices (say, the 2SA1210/2SC2912 in the TO-126 package) in addition to the TO-5 package devices currently used? Just to be clear, I'm saying adding patterns (pads, holes, routes, etc.) IN ADDITION to the original Leach selected parts. That way, one could build the original design and experiment/update with more modern parts without tearing up the PCBs.

By the way, I think I'll be looking for six boards :-)
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Old 1st July 2002, 02:51 PM   #15
mlloyd1 is offline mlloyd1  United States
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Default Re: nice layout! what if ....

ooops! forgot to add the device pics!

Quote:
Originally posted by mlloyd1
Brian:
Your layout really looks good! What's the possibility of adding patterns to use the 2SA1349/2SC3381 ....and adding patterns for .... the 2SA1210/2SC2912 in the TO-126 package....
mlloyd1
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Old 3rd July 2002, 03:47 PM   #16
BrianGT is offline BrianGT  United States
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Sorry, I cannot add extra pads for these devices, but the existing pads are spaced far enough apart for use of these devices, and the holes are big enough for the leads of your devices.

I have posted a new version of the leach amp pcb at:
http://brian.darg.net/leachamppcb

Revisions include:
- room for larger caps (film and electrolytic) in the input stage
- spacing set for use of terminal blocks for input and output
- added information to silkscreen
- greatly fattened the trace where the output device currents sum up
- widened the board by 0.5" to accomidate the wider trace and the larger caps. This also left room to fit the terminal block for the inputs.

I believe that I have finished the pcb layout. If anyone has any suggestions, let me know.

Thanks a lot to those who have e-mailed me suggestions for board improvement!

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Old 4th July 2002, 09:48 AM   #17
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Default Similar project

Hello there

At the moment I'm making a set of PCB's for the Leach Amp.

The concept is like this:

Small signal board with overything but drivers and output transistors

Output board with driver and output transistors. And an option to put in more output transistors.

This way it's easy to try out different transistors in the output stage without having to assemble severel different sets of PCB's

There is a thread for this.
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Old 7th August 2002, 09:38 PM   #18
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Default Making prototypes

Hi again

Got my output prototype PCB's done.

Working on the input

\Jens
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Old 8th August 2002, 06:34 AM   #19
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Nice looking prototype but is it need for so many output devices (compared to the heatsink)?
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Old 8th August 2002, 06:51 AM   #20
EJ is offline EJ
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Talking nice job!

Nice looking board! And it seems to be single sided, making it easy for me to reproduce one by myself. However, why did you put all your components on the copper side? Doesn't this make your soldering difficult for components such as elec.caps?
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