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Old 25th May 2002, 03:35 AM   #1
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Default Leach SuperAmp Photos

Here are pictures of a Leach SuperAmp that I finished last year. The circuit boards I designed myself with two channels per board. The design also features an LED VU meter for each channel that consist of ten blue LEDs for each channel. They light up behind the smoke tinted bezel on the from panel. Each channel does just about 270RMS per channel into an 8 ohm load. I have run the amp into as low as a 3 ohm dummy load and was able to achieve just about 1100WRMS per channel (not simultaneously). It runs hot it you do this. There are two fans which blow across each heatsink to cool them. The Transformer is a 1500VA ordered from Plitron in Canada somewhere. The caps are 55,000uF / 100V for each rail. The power supply generates plus and minus 90V rails which are shared by the two channels. Most of the wiring is neatly tucked, bound, and routed under the board and to the BJTs under the heatsink so that there is no eyesore inside. All of the wiring is teflon so there should be little concern about melting. Though it only gets hot if it is run into low test loads. There is also a clipping indicator on the board and a smaller supply to deliver power to the LED meter, the LEDs, the startup circuit, and the clipping indicator. And that is all I have to say....thought it would be nice to add.

I am currently finishing up a completely custom four channel (4 x 180 into 4 ohm) integrated class-T amplifier. Featuring 3 band tone controls, mute, bridging, volume, balance, switching power, active power factor correction. All less than a third of a cubic foot and less than 8 pounds. Let me know what everyone thinks about this idea. I will post pictures and answer questions about the project, class-T performance, or switching power overall if no one has tried it.

BeanZAudio



[IMG]file:///C:/My%20Documents/BeanZ/Amplifier/Above1.JPG[/IMG]
[IMG]file:///C:/My%20Documents/BeanZ/Amplifier/Above2.jpg[/IMG]
[IMG]file:///C:/My%20Documents/BeanZ/Amplifier/Above3.jpg[/IMG]
[IMG]file:///C:/My%20Documents/BeanZ/Amplifier/Front2.jpg[/IMG]
[IMG]file:///C:/My%20Documents/BeanZ/Amplifier/PowerSupply.JPG[/IMG] [IMG]file:///C:/My%20Documents/BeanZ/Amplifier/Top.jpg[/IMG]
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Old 25th May 2002, 05:55 AM   #2
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I'm sure it looks great, but I can't see the pictures. You have to attach them to the thread using the "Attach File" thing at the bottom when you type your post.

1100W RMS?!! WOW! Can't wait to see your pics!
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Old 25th May 2002, 06:44 AM   #3
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Let's see if these show up....
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Old 25th May 2002, 06:46 AM   #4
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...and another
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Old 25th May 2002, 06:51 AM   #5
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...and a few more
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Old 25th May 2002, 06:59 AM   #6
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Top View. I also have a closer higher resolution picture of the populated and installed circuit board but it is 104K.
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Old 25th May 2002, 09:08 AM   #7
bawang is offline bawang  Malaysia
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Wow, sharp looking amp BeanZ. I've been dreaming to construct the Leach Superamp ever since I've construct the Leach Amp last year, but the prospect of drilling for all holes for the 8 numbers of TO3 transistors per channel, a huge PCB (as per Prof. Leach's design), countless wires to hook it all together put me on the hold for the moment. After all, even 14 wires per PCB to/from the heatsink for the Leach Amp is already quite a chore. But I have to admit, it's worth it.

Anyway, an excellent job, BeanZ.
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Old 25th May 2002, 06:10 PM   #8
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I actually typed the low impedance power incorrectly. That 1100W was not RMS but the peak power corresponding to about 850-900WRMS into a little less than 3 ohms. I will be posting pictures of the custom Efficient Integrated Audio Amplifier soon stay tuned......

BeanZ
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Old 11th March 2003, 02:28 AM   #9
Diode is offline Diode  United States
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Hey BeanZ,

Kick *** job. Very cool amp!

What software did you use for the layout and silkscreen? Do you also have a schematic capture program? Do you still have the gerber files for that board? How much did it cost you? I want to build a high power amp but really can't decide on a design. I'd like to build a 600-800W amp that isn't overdesigned. The leach amp "seems" overdesigned. I have heard rave reviews about it though. If not the Leach amp, do you have any suggestions? The transformers, I have access to 2 of them, are dual secondary and give 76VDC each. They came out of a Peavey PV800. Both chanels can provide 800WRMS each. I figure the transformer can do a single 800W amp especially if I parallel the 2 DC supplies. Any suggestions as to a good amp to build, aside the Leach super amp, would be appreciated. Simple and HiFi woulde be best!

Thanks,

Chris
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Old 11th March 2003, 02:30 AM   #10
Diode is offline Diode  United States
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Woulde,

That's Olde English, by the way! LOL Also, I want to use 2SA1943 and 2SC5400's in the output section.

Chris
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