|8th May 2004, 11:09 PM||#1|
Join Date: Mar 2004
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.
|9th May 2004, 02:34 AM||#2|
Do not despair, though they seem to be winning
now, they always fall in the end......Gandhi
|10th May 2004, 04:43 PM||#5|
Join Date: Jan 2002
Location: Livermore, CA
Nice work, Jens! Did you fabricate/etch your actual PCB's, too?
Is your running with high bias, considering the heatsink size?
|10th May 2004, 05:27 PM||#6|
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.
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