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Old 8th May 2004, 10:09 PM   #1
Wagener is offline Wagener  South Africa
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Default post your leach amp photos

I would like to see the leach amps built by the people of diyaudio.

Please post it here.

I have already found a few with the search but I want more.
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Old 9th May 2004, 01:34 AM   #2
AJT is offline AJT  Philippines
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here's mine:http://gallery44059.fotopic.net/p2774837.html

http://gallery44059.fotopic.net/p2774836.html

http://gallery44059.fotopic.net/p2774837.html

http://gallery44059.fotopic.net/p2774840.html
http://gallery44059.fotopic.net/p2774838.html

http://gallery44059.fotopic.net/p2774841.html
http://gallery44059.fotopic.net/p2774839.html
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Old 10th May 2004, 02:11 PM   #3
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Here is my slightly modded Leach, The layouts are homemade.

\Jens
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Old 10th May 2004, 02:18 PM   #4
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Close up of the small signal boards
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Old 10th May 2004, 03:43 PM   #5
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Nice work, Jens! Did you fabricate/etch your actual PCB's, too?

Is your running with high bias, considering the heatsink size?


Regards,

Jon
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Old 10th May 2004, 04:27 PM   #6
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Hi Jon,

Yes I etched the PCBs myself using the equipment available at the school I studied at when I build the amp.

I was running the amp at about 100W idle for each of the four channels; however I could not perceive any difference when changing this to about 30W so this is the current (no pun intended) itís now set at.

I made some modifications by adding three extra sets of output transistors, and changing the input small signal transistors to BC546/556 because these are commonly available here in Denmark.

The rest of the transistors are:

MJE340/350 for VAS and predrive stage.
MJE15032/15033 for driver stage.
MJL3281/1302 for output.

I noticed a lot of questions from Wagener regarding this amp I hope you donít mind me answering here where more people can read it and hopefully use it.

The caps I used are almost all PP (Polypropylene) or PE (Polyethylene) types, except for the supply decoupling caps witch all are some form of electrolytic that I had I in stock.

The only ceramic caps I used are the ones used in the VAS stage for stability and the one in the feedback compensation network.

I used a large NON polarised electrolytic (470 ĶF) caps for input DC block, and another for the feedback cap that sets the low cut off frequency.

I hope this helps.

\Jens
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Old 10th May 2004, 05:30 PM   #7
Borc is offline Borc  Slovenia
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Leach with 2SA1302,2SC5200 without current limiter, 10 Ohm output base resistors.
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Old 10th May 2004, 05:32 PM   #8
Borc is offline Borc  Slovenia
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Another one
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Old 11th May 2004, 05:32 AM   #9
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Is that a seperate power supply for each amp? Any particular reason?
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Old 11th May 2004, 03:40 PM   #10
Borc is offline Borc  Slovenia
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No particular reason. Separation of both channels.
Transformers are quite cheap here ($35 for one).
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