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Old 22nd December 2010, 06:26 AM   #1351
asia is offline asia  Philippines
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another hint,
1000w possible @ 40pcs output?/channel
same thead
http://www.pinoydvd.com/index.php/topic,89268.30.html

all i have done are 250watter leach amps....leach amps are not tiring to listen to even at high volume levels...... Click the image to open in full size.

pang mobile ba? yes it is possible to do it, i have asked a friend to design a pcb for me using Leach's doubled barreled amplifier topology using 10 qauds of those ON-Semi devices, that's 40 transistors per channel output.

Last edited by asia; 22nd December 2010 at 06:30 AM.
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Old 22nd December 2010, 06:34 AM   #1352
asia is offline asia  Philippines
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a rough scanning of doubled barrel diagram,
where to find original st(2n3439)(2n5415)
makes me think its hard to find(wala sa list ng alexan)
and where to find mica caps
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Old 22nd December 2010, 06:36 AM   #1353
asia is offline asia  Philippines
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390pf
180pf
47pf
all mica,
a special notation not to use ceramic
,
so where to find?
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Old 22nd December 2010, 06:37 AM   #1354
asia is offline asia  Philippines
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here what djk say about leach
Whats your view regarding parallel stage..."

The older MX2000 sounds better than the MX2000A, for what it's worth.

The Crest CA9 sounds better than those, it's class G (they call it class H, but it's linear, not a hard switch). I'm sure the OPA2604 vs the NE5532 makes a small difference, but the current limiting circuit QSC uses really makes them sound less than perfect. The dynamics are really poor. QSC uses a pair of adjustable load resistors on they output of the 5532, and depend on the current limit in the IC.

The Leach LSR&D 101 will kick either amp to the curb (with only 63V rails, two 20,000F caps, a 1KVA transformer, and three pair of MJ15011/12 per channel ). Driven slightly into clipping it still sounds cleaner than the QSC, and has a lot more slam in the bass. Funny how that works out, a 160W/8R hi-fi amp vs a 1KW/2R PA amp (the speakers used were a 2R load).
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Old 22nd December 2010, 06:40 AM   #1355
asia is offline asia  Philippines
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leach vs. qsc
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Old 22nd December 2010, 06:41 AM   #1356
asia is offline asia  Philippines
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another,
The QSC 2000 play a little bit louder in the midrange than the LSR&D 101, not much though. The Leach sound much cleaner in the highs, much tighter in the bass, and can actually hit harder and play louder in the bass.

Amplifier power ratings on the bench driving a resistor tell little about how an amplifier will drive a loudspeaker, you have to listen to them to really tell how they sound and what they can do.
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Old 22nd December 2010, 06:42 AM   #1357
asia is offline asia  Philippines
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LSDR&D is leach
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Old 22nd December 2010, 06:45 AM   #1358
asia is offline asia  Philippines
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ooow mr jens
another leach witness
http://www.noermoelle-rasmussen.dk/D...5.6.10_sch.pdf
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Old 22nd December 2010, 06:47 AM   #1359
asia is offline asia  Philippines
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sir tony is right,
leach is a teacher,
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Old 22nd December 2010, 06:48 AM   #1360
asia is offline asia  Philippines
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sir tony
i will quote this
the secret, if you can call it as such is in the power supply....i used 47,000ufd electrolytics, a 35 ampere rectifier bridge and very heavy power transformers whose secondaries are wound bifilliar to exactly locate the center tap, about twice as heavy as other commercial power traffos...
how to do it
the bifiliar?
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