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Old 6th December 2005, 02:27 PM   #111
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C14 and c15 is 100uF/100v or?? Can I have bipolar?
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Old 6th December 2005, 05:20 PM   #112
Bensen is offline Bensen  Belgium
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This won't help you to fixing your amp. But anyhow, why in heavensname would you choose bipolars??? Just take standard elektrolytics, 100 or 1000 or....

We can't guess what is wrong with your amp, you have to give us values, indications, .....
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Old 20th December 2005, 09:50 PM   #113
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Now I have test my Crescendo for the second time and yhis time some restors gone up i smok, and it was different restors on eatch card. I use 10ohms resistors that fuse but them gone not up in smok why can someone help me please???
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Old 20th December 2005, 10:05 PM   #114
lineup is offline lineup  Sweden
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And which resistors went up in smoke?
R1 or R2 or Rxx ?
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Old 21st December 2005, 05:12 AM   #115
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R15,R16 on the first card and R6,R10,R9 on the second card!
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Old 21st December 2005, 07:46 AM   #116
AndrewT is offline AndrewT  Scotland
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Hi Danne,
can you post the schematic you are building from?
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Old 21st December 2005, 09:06 AM   #117
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Her it is!!
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Old 21st December 2005, 10:55 AM   #118
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Or this maby?
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Old 21st December 2005, 05:11 PM   #119
Bensen is offline Bensen  Belgium
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Finally, now we can get somewhere.

All these resistors can be smoked due to a failure in the diff stage.

When the current throught the legs of the diff stage is to high (R9 + R10), this would give a high voltage over resistor R11 + R13, then this will cause a high current to flow through R15 + R16.

Make sure you use BC546 and BC556 (80V devices)
Make sure you did the assembly correctly (changed two transistors??)
Check that zener diode (3.9V), when this is broken, it could be a short. Or maybe an other voltage. This would lead to a higher current through the diff stage --> power dissipation in these transistors is to much.

Ben
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Old 21st December 2005, 05:56 PM   #120
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Ok I gone to check that but if that not ist that ist that only to fix the resistors an try again, when i test most I have the loudspeakers kabel on and the ground???
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