What are you using instead of 5551 and 5401?
2n5551 and 2n5401
2n5551 and 2n5401
Make sure that you solder those in the right direction and you haven't mix them.
Make sure that you solder those in the right direction and you haven't mix them.
İ check all again and change the 5401 with new one. And save thhe resistor but now - 9v at audio out
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i will rebuild it i dont know what is wrong taking out and put back making pcb lose roads i need start new one i think
I can't see any 0R47 Ohm. resistor.
Resistors that i see IN YOUR PICTURE are 4K7, 4700 Ohm!
Resistors that i see IN YOUR PICTURE are 4K7, 4700 Ohm!
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I can't see any 0R47 Ohm. resistor.
Resistors that i see IN YOUR PICTURE are 4K7, 4700 Ohm!
ty for helping thimios,
i make pictures
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Measure voltage at 15v zeners.
Measure voltage across 0.47 Ohm.
Use a bulb in series with the transformer primary to save your amplifier .
ATTENTION when working with the main!
DANGER!
Use a combination of a cheap speaker in series with a 1000uf electrolytic capacitor as a load on the amplifier speaker output.
Play some music.
Measure voltage across 0.47 Ohm.
Use a bulb in series with the transformer primary to save your amplifier .
ATTENTION when working with the main!
DANGER!
Use a combination of a cheap speaker in series with a 1000uf electrolytic capacitor as a load on the amplifier speaker output.
Play some music.
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Measure voltage at 15v zeners.
Measure voltage across 0.47 Ohm.
Use a bulb in series with the transformer primary to save your amplifier .
ATTENTION when working with the main!
DANGER!
Use a combination of a cheap speaker in series with a 1000uf electrolytic capacitor as a load on the amplifier speaker output.
Play some music.
on zeners 15.4v
on 0,47ohm 0v
which kind a bulb do i need to use on it i have 10a fuse on board its not saving the amp?
not: when i give ac power, audio output have 0V. when i cut ac voltage then on audio out getting dc voltage and raise slowly to -9V i just see that luckly
Connect a cheap speaker as you see here.
Connect an input signal at the amplifier input .
Play some music.
i did that my friend no signal coming out. this will be second channel. first one working but this is i cannot find what is the problem.tomorrow i will make new pcb and new components i will post here what will happen.
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Play some music.
hi timos i did play music 🙂) 3 channel b500 burned. r21 (100R).
any one please help if you have time i need finish this amplifier killing me.
my 2 channels not work good but 1st one was working good but now 3 channel burn R21 100R same resistor.
and they burn 5200 transistors too 🙁((((((
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- 500W PA amplifier with Limiter