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Old 29th April 2006, 09:08 AM   #31
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yes exactly this way. emiter to emiter, base to base, colector to colector.
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natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..
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Old 29th April 2006, 09:10 AM   #32
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One less issue to worry about.
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Old 29th April 2006, 09:10 AM   #33
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irf9610 and irfp240 have the same pinout: GDS
BC550 is correct.

/Hugo
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Old 29th April 2006, 09:12 AM   #34
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is it posible to measure small resistors without soldering out? I also checked all 9 jumpers,but all contacts is firm. is it osible to test mosfet with multimeter,like in diode mode or smsth.like this?
theese bias L bias R and bias Q is setted up to zero position. I tried other positions but no luck..
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Old 29th April 2006, 09:16 AM   #35
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yes I do some mistekes ,but BC550 was pain lessons(diferent manufacturers diferent pi out)few time so i learned lesson.. should I solder out resitors and measure, or should I desolder transitors and measure(like in maching process? there is so litlle components in this amp and I still cant find problems. I also checked soldering point but contact is OK, just in case I resoldered joints.
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Old 29th April 2006, 09:27 AM   #36
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Most resistors can be measured in-circuit.

Disconnect the amp board completly from the powersupply
before measuring resistance.

If the measured value is not correct, simply desolder one leg
of the resistor and measure again.

Do this systematically, from R1 to Rn.
Make records.
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Old 29th April 2006, 09:29 AM   #37
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Take one of the 10 pieces.
Desolder and replace all components (5 components per day).
It will work so that you can find the problem with the remaining 9 pieces.

Regards
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Old 29th April 2006, 09:40 AM   #38
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OK, now I am doing this. I am testing boards not conected to Heatsinks now. also not conected rca input and speakers output.
just conect for 4sec.or so ensure that irfp240cold and testing circuit conected only + - and gnd
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Old 29th April 2006, 11:44 AM   #39
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Default that was cool!

I checked all resistors and quess what- insted 100Kohm I soldered in 100ohm. how I did that? I carefuly mached resistors, BUT FORGET VALUES! i just put simply resistors back to pack paired. now I measured all left resitors in pack in both pack they are 100ohm. inspite on secon bag written100pieces 1% 100kohm!! is there any lawyers out there ? i think I will court my local shop fro things like theese. threy cut my life at least 5 years.
I turend on amp now for a few seconds and fets got hot , dc ofset reads 0,01v seems it should work.

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Old 29th April 2006, 11:50 AM   #40
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Congratulations - what a frustrating experience.

Another lesson learned the hard way. You're not the only one to do that.
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