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Old 4th January 2013, 06:52 AM   #221
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Please see, the smaller torrid primary is 40 amps x 240 volts = around 9.6 kw,and other one 60 amps. x 240 volts =14.40 kw. not 5 Kw. and I want to use them for 4 chanalles of amp on each traffo. And I will do that in near future, smaller one for 1.8 kw. class ab x 4 chanalles . and bigger one 2.5 kw x 4 channeles in class AB only.
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Old 4th January 2013, 09:22 AM   #222
djk is offline djk
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I would definitely do a 100%-50%-0-50%-100% secondary winding and a class G output stage.

10 pair of MJ15024/25 will have a beta of 15 at 80A require about 5A of drive current, and about 250mA from the pre-driver (a triple output circuit). 80A peak would be 56.6A RMS, or about 3.2KW at 1Ω.

The TO-66 250V/2A 30Mhz 40W SOA at 100V pre-driver I used is no longer available. I would probably use something like the 2SA1943/2SC5200, although rated at 40W SOA at 100V it will not be as robust due to its 150C junction temperature rating vs the 200C rating on the TO-66 part. If you could get the ON Semiconductor MJL/MJW 1302/3281 that would be even better with their 100W SOA at 100V they would be adequate.

The top rail would be a duplicate of the bottom rail with a 6V level shift, so you would end up with roughly the same number of output devices you originally planned for, but much better reliability. This would essentially be the Crest 10004 output stage with your supply being much stiffer.
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Old 4th January 2013, 07:57 PM   #223
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Thanks Mr. Djk for your real and valuable advice I have noted down,do you have this crest 10004 circuit,if you can post, I have 50 pairs of motorola 15024 and 25 with me I want to use them
thanks again
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Old 4th January 2013, 08:30 PM   #224
HighTec is offline HighTec  Croatia
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Well, if you want to build this.. this...ermm... MRI coil driver, then be my guest.

Pro_10001.pdf

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Old 4th January 2013, 09:18 PM   #225
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Well, if you want to build this.. this...ermm... MRI coil driver, then be my guest.

Pro_10001.pdf
LOL!
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Old 5th January 2013, 01:42 PM   #226
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Yes Sir this is a leach amplifier modified.no P.c.b. is used in output section. Rail wires are 2.5 m.m. thick.Today I run this amp for 6 hours non stop with 8nos. 15' speakers+8 nos.12" speakers +8 nos. Tweaters Total d.c resistance .5 ohm upto 52 volt and 33 amps on output. Crispy crystal clear highs lively mid and deep low was what I got . I am happy with result.Sugestion to make this was by Capsighter Chinoko .sending some more photos.Paa ji Aap ko main aap ki id par message bhejunga.
hi vedmitraa,
can u share this amp pcb layouts.
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Old 13th January 2013, 08:29 AM   #227
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Default my 1400 watts per channel class Ab amp

well it is actually a modified version of super leach 700 watts with 16 pairs of 5200 , 1943 in output and one pair as driver,p.c.b. section only used upto predriver as yu can see in photos.Power really more than 1400 watts crispy h.f., melodious mids,and thumping bass, have now tested even with 6 nos. 18" speakers parallel for more than 4 hours.
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Old 13th January 2013, 09:20 AM   #228
naf is offline naf  Indonesia
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Originally Posted by vedmitraa View Post
well it is actually a modified version of super leach 700 watts with 16 pairs of 5200 , 1943 in output and one pair as driver,p.c.b. section only used upto predriver as yu can see in photos.Power really more than 1400 watts crispy h.f., melodious mids,and thumping bass, have now tested even with 6 nos. 18" speakers parallel for more than 4 hours.
thank you very much vedmitraa, would you share the schematic?
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Old 17th January 2013, 04:27 PM   #229
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Default leach circuit

This Circuit has been published in this forum many times ,still once again
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Old 17th January 2013, 06:15 PM   #230
wg_ski is offline wg_ski  United States
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Originally Posted by vedmitraa View Post
well it is actually a modified version of super leach 700 watts with 16 pairs of 5200 , 1943 in output and one pair as driver,p.c.b. section only used upto predriver as yu can see in photos.Power really more than 1400 watts crispy h.f., melodious mids,and thumping bass, have now tested even with 6 nos. 18" speakers parallel for more than 4 hours.
That's not a 'Super Leach' - it's just the standard Leach circuit with a few(?) extra output transistors. The real 'Super Leach' uses the cascode output stage which you could run off these supply voltages all day long - if you can get the heat out - with no question as to the long term reliability. If you're open to experimentation you might want to give it a try before blowing up banks of 14 C5200's. A 7x2 arrangement really is more reliable if you go over over 90V rails. It's also pretty easy to convert the S-Leach (later) to a class G by adding some additional support circuitry. Two 30A ultrafast rectifiers, a zener and bootstrap capacitor, and an RC snubber on each bank (it really is that simple).
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