At a garage sale the other day i picked up a couple of broken soundstream car amps for a couple bucks. The smaller amp an SA-80 has a separate SMPS power supply board inside which i found very interesting as I had hoped to use just the power supply parts anyway for a LM3886 based car amp project. this board looks like it would work perfect and the voltage is about right.
it is based on a SG3524 IC with a pair of BUZ11 mosfets driving a toroid transformer, feeding to TO-220 type dual high speed diodes and 1000uf per rail. I see that the board is short stuffed and that 2 additional pairs of mosfets could be added and 4 more capacitors. a very simple design.
I am curious if i can figure how what the rated current is for this power supply? is there a method to tell? or should i just load it down and see if/where it breaks or otherwise sags past some point? I see that the SG3524 has some current limiting protection inside. maybe the supply will just shut down?? I am looking for schematics now.
it is based on a SG3524 IC with a pair of BUZ11 mosfets driving a toroid transformer, feeding to TO-220 type dual high speed diodes and 1000uf per rail. I see that the board is short stuffed and that 2 additional pairs of mosfets could be added and 4 more capacitors. a very simple design.
I am curious if i can figure how what the rated current is for this power supply? is there a method to tell? or should i just load it down and see if/where it breaks or otherwise sags past some point? I see that the SG3524 has some current limiting protection inside. maybe the supply will just shut down?? I am looking for schematics now.
first of all this is unregulated supply, so output voltage depends a lot on input voltage.
one way is to find how strong was the original amp, my guess is that one or two LM3886 won't draw anywhere too much current, I wouldn't even try to see what the max is.
it could have overcurrent protection.
one way is to find how strong was the original amp, my guess is that one or two LM3886 won't draw anywhere too much current, I wouldn't even try to see what the max is.
it could have overcurrent protection.
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