Leach amp pcb's

Wagener · 28th March 2004, 09:47 AM

Does anyone have PCB layouts for the leach amp that has the output transistor on the PCB? I am looking for a design that is better than the on on Mr. Leach's website

I can accept basically any type of drawing.

Thanks in advance

Johan Wagener
200234315@ctech.ac.za(removethis)

JensRasmussen · 28th March 2004, 01:58 PM

Hi,

try this thread (Found via the search function in under 30 seconds

):

redesign of leach amp pcb for integrated TO-247 output devices

\Jens

azira · 28th March 2004, 05:38 PM

Quote:

Originally posted by Wagener
Does anyone have PCB layouts for the leach amp that has the output transistor on the PCB? I am looking for a design that is better than the on on Mr. Leach's website

What do you mean by "better" The main reason the PCB by Dr Leach doesn't have transistors on the PCB is that he chose TO-3 transistors instead of TO-220 or TO-247's.
--
Danny

Wagener · 29th March 2004, 08:53 AM

well. I am looking for a layout that has the to-3 mounted on the pcb.

Why would he not have placed them on the pcb? Its not that hard to heatsink the transistors on a pcb?

Thanks for the replies

JensRasmussen · 31st March 2004, 06:34 AM

Hello,

The reason maybe that the PCB size gets (alot) bigger when you start to mount output transistors on it.

Also if you want to have your output on the PCB I suggest that you put them in line parallel to the heatsink, and use an "L" profile to transfer heat to the heatsink.

There might wery well be another reason that Dr. Leach used output transistors mounted with wires away for the PCB, simply the fact that the L profile is less than optimal seen from a thermal point of view.

\Jens

BrianGT · 31st March 2004, 09:45 AM

Links to boards with integrated TO-3 devices:

http://home.swipnet.se/malman/LeachAmp.html

Modified version of Leach amplifier

Leach Amp

--
Brian

kon_udorn · 1st April 2004, 03:55 PM

Hello,
I am quite new memeber in this forum. But I have made leach amp with my own pcb design many unit. I can say that this is the best amp I had ever made. This is my pcb design with output TO-3 (2SC5200/2SA1943)on the board.It is in protel format. Have fun!!

Herman · 3rd April 2004, 08:06 PM

Kon: What is the file format *.pcb in your zip file ??? (TIF ? JPEG or something more special ?)

Greetings
Herman

kon_udorn · 4th April 2004, 07:34 PM

Hi all,
Sorry for mistake. The file that I had post is not my latest one. So here is my latest pcb. This file is created by using Protel 99 se software. You can modify with your own idea. Have fun!!

wopo · 10th April 2004, 07:17 AM

Hi Folks!

If you are interested in Leachamp PCB artwork with all transistor on the PCB, please send me en e-mail. I tried to upload the file (PDF), but is to big.

Wopo

28th March 2004, 09:47 AM	#1
Wagener diyAudio Member Join Date: Mar 2004 Location: Paarl	Leach amp pcb's Does anyone have PCB layouts for the leach amp that has the output transistor on the PCB? I am looking for a design that is better than the on on Mr. Leach's website I can accept basically any type of drawing. Thanks in advance Johan Wagener 200234315@ctech.ac.za(removethis)

28th March 2004, 01:58 PM	#2
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	Leach amp PCB with output transistors Hi, try this thread (Found via the search function in under 30 seconds ): redesign of leach amp pcb for integrated TO-247 output devices \Jens

31st March 2004, 06:34 AM	#5
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	Heatsinking To3 on PCB Hello, The reason maybe that the PCB size gets (alot) bigger when you start to mount output transistors on it. Also if you want to have your output on the PCB I suggest that you put them in line parallel to the heatsink, and use an "L" profile to transfer heat to the heatsink. There might wery well be another reason that Dr. Leach used output transistors mounted with wires away for the PCB, simply the fact that the L profile is less than optimal seen from a thermal point of view. \Jens

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29th March 2004, 08:53 AM	#4
Wagener diyAudio Member Join Date: Mar 2004 Location: Paarl	well. I am looking for a layout that has the to-3 mounted on the pcb. Why would he not have placed them on the pcb? Its not that hard to heatsink the transistors on a pcb? Thanks for the replies

31st March 2004, 09:45 AM	#6
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	Links to boards with integrated TO-3 devices: http://home.swipnet.se/malman/LeachAmp.html Modified version of Leach amplifier Leach Amp -- Brian

3rd April 2004, 08:06 PM	#8
Herman diyAudio Member Join Date: May 2001 Location: Europe	Kon: What is the file format *.pcb in your zip file ??? (TIF ? JPEG or something more special ?) Greetings Herman

10th April 2004, 07:17 AM	#10
wopo diyAudio Member Join Date: Feb 2004 Location: Vienna - Austria	Hi Folks! If you are interested in Leachamp PCB artwork with all transistor on the PCB, please send me en e-mail. I tried to upload the file (PDF), but is to big. Wopo

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