Looking for SuperLeach AMP PCBs

yeshu26 · 21st August 2006, 07:18 AM

BobEllis · 21st August 2006, 01:18 PM

Unless you are really set on the Superamp, the regular Leach can be modified to handle higher voltage rails fairly easily now that there are transistors available with reasonable high voltage SOAs. These weren't available when Leach designed the SuperAmp, forcing the use of cascodes.

Use MJ(L)21195/96s or MJL4281/4302 outputs and MJE15032/33 drivers. Be sure to follow the instructions for adjusting the front end for other rail voltages and use plenty of heat sinking on the predrivers and drivers. Use at least four pairs of plastic output devices, you might be able to get away with two metal if you aren't really going to push it hard. If you are thinking PA use, use at least four metal or six plastic outputs.

yeshu26 · 21st August 2006, 05:00 PM

good idea! Can you provide with the revised partslist if you have please?

BobEllis · 21st August 2006, 05:25 PM

Use the standard Leach parts list, calculating the resistors for your rails.

For an updated design see www.delta-audio.com. There once was a group buy of Jens' 6 transistor version. Someone may have them available or I think that you can download the gerbers and have them made.

yeshu26 · 29th August 2006, 03:58 PM

Hi Bob,

I have 3 leach pcbs with me. so i just need to use high value transistors and some resistors need to be changed

eh?

rgds

BobEllis · 4th September 2006, 04:52 AM

Change R13/14 in Leach's schematic, the output devices and resistors in the protection circuit (about 100 pages into the smaller leach amp thread is a discussion on how to calculate them for your chosen output devices).

Output devices should be rated for at least double the rail voltage.

Also change the drivers to MJE15032/33 or 34/35 for higher voltage capability as well as higher hfe.

21st August 2006, 07:18 AM	#1
yeshu26 diyAudio Member Join Date: Jul 2003 Location: New Delhi	Looking for SuperLeach AMP PCBs Looking for SuperLeach AMP PCBs

21st August 2006, 05:00 PM	#3
yeshu26 diyAudio Member Join Date: Jul 2003 Location: New Delhi	Re:Superleach good idea! Can you provide with the revised partslist if you have please?

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21st August 2006, 01:18 PM	#2
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Unless you are really set on the Superamp, the regular Leach can be modified to handle higher voltage rails fairly easily now that there are transistors available with reasonable high voltage SOAs. These weren't available when Leach designed the SuperAmp, forcing the use of cascodes. Use MJ(L)21195/96s or MJL4281/4302 outputs and MJE15032/33 drivers. Be sure to follow the instructions for adjusting the front end for other rail voltages and use plenty of heat sinking on the predrivers and drivers. Use at least four pairs of plastic output devices, you might be able to get away with two metal if you aren't really going to push it hard. If you are thinking PA use, use at least four metal or six plastic outputs.

21st August 2006, 05:25 PM	#4
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Use the standard Leach parts list, calculating the resistors for your rails. For an updated design see www.delta-audio.com. There once was a group buy of Jens' 6 transistor version. Someone may have them available or I think that you can download the gerbers and have them made.

29th August 2006, 03:58 PM	#5
yeshu26 diyAudio Member Join Date: Jul 2003 Location: New Delhi	Hi Bob, I have 3 leach pcbs with me. so i just need to use high value transistors and some resistors need to be changed eh? rgds

4th September 2006, 04:52 AM	#6
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Change R13/14 in Leach's schematic, the output devices and resistors in the protection circuit (about 100 pages into the smaller leach amp thread is a discussion on how to calculate them for your chosen output devices). Output devices should be rated for at least double the rail voltage. Also change the drivers to MJE15032/33 or 34/35 for higher voltage capability as well as higher hfe.

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