hi everyone,
I've just finished my new amp (own class AB design - 120W into 8ohms) and it works very nice, but there's only this problem left:
when I touch my finger to the connector, or when I connect the connector to my mixer one transistor (at output) blows up.
The inputimpedance is 22k and the gain is 100x. Could this be the problem (so should I lower the input-resistor and the gain?)? What values do you recommend for these?
thank you.
HB.
I've just finished my new amp (own class AB design - 120W into 8ohms) and it works very nice, but there's only this problem left:
when I touch my finger to the connector, or when I connect the connector to my mixer one transistor (at output) blows up.
The inputimpedance is 22k and the gain is 100x. Could this be the problem (so should I lower the input-resistor and the gain?)? What values do you recommend for these?
thank you.
HB.
Own design. Please forgive me, but is it stable? When it blows have you checked what comes out with a scope?
/UrSv
/UrSv
demolition man
Hey Hugo,
Sounds like a stability problem. Either that or you are a highly charged individual. 😀
Can't really comment without a schematic.
BAM
Hey Hugo,
Sounds like a stability problem. Either that or you are a highly charged individual. 😀
Can't really comment without a schematic.
BAM
hi,
thanks,
maybe this wasn't very clear: I reconnected the connector to my mixer because I've heard some noise due to the bad contact.
I've just changed the input impedance to 10k, and gain is 45x right now. I didn't have any problems anymore by so far.
The amp 'seems' to be stable speaking of higher frequencies and temperature, but I couldn't test it yet on a scope, because I still cannot afford one as student. So for all the amps I've made by so far I've just used a simple digital mutimeter (+ a sine generator) and my ears to qualify the sound. Soon I'll test in the lab at school.
Maybe the fault is due to the fact I've used just a single pair BDV66/67, I'm going to use the amp with at least two pairs of them and on bigger heatsinks.
I'll publish the schematic ASAP.
BTW, do you mean stable at higher freq. ?? If so, I can do some tests with a high freq at input, my generator alows up to 100kHz
Best regards,
HB.
thanks,
maybe this wasn't very clear: I reconnected the connector to my mixer because I've heard some noise due to the bad contact.
I've just changed the input impedance to 10k, and gain is 45x right now. I didn't have any problems anymore by so far.
The amp 'seems' to be stable speaking of higher frequencies and temperature, but I couldn't test it yet on a scope, because I still cannot afford one as student. So for all the amps I've made by so far I've just used a simple digital mutimeter (+ a sine generator) and my ears to qualify the sound. Soon I'll test in the lab at school.
Maybe the fault is due to the fact I've used just a single pair BDV66/67, I'm going to use the amp with at least two pairs of them and on bigger heatsinks.
I'll publish the schematic ASAP.
BTW, do you mean stable at higher freq. ?? If so, I can do some tests with a high freq at input, my generator alows up to 100kHz
Best regards,
HB.
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