ruffrecords
Well-known member
dirtyhanfri said:
It should not do that. The output is divided by two by R6 and R7 and compared to the 24V zener. I would first check the voltage across the zener.
Cheers
Ian
48V from 15V secondaries
- Thread starter dirtyhanfri
- Start date
Help Support GroupDIY Audio Forum:
It should not do that. The output is divided by two by R6 and R7 and compared to the 24V zener. I would first check the voltage across the zener.
Cheers
Ian
dirtyhanfri
Well-known member
I've got 0.5VDC across the Zener
I'm using a 18-0-18 transformer, and I'm feeding the circuit with just one secondary winding, because when fed with both windings in series I had 101V at the output (glad I didn't plug my 414 for test it) anyway, my transformer reads 21VAC at each secondary with no load, I'm not sure if this is normal behavior.
Thanks for the help
I'm using a 18-0-18 transformer, and I'm feeding the circuit with just one secondary winding, because when fed with both windings in series I had 101V at the output (glad I didn't plug my 414 for test it) anyway, my transformer reads 21VAC at each secondary with no load, I'm not sure if this is normal behavior.
Thanks for the help
ruffrecords
Well-known member
dirtyhanfri said:
Sounds to me like you have wired the zener in backwards.
Cheers
Ian
dirtyhanfri
Well-known member
I had Q2 reversed, didn't change that, tomorrow I'll try, zener was ok
Anyway I had another 2 psus, one of them working nicely, fed with 21VAC and giving +42VDC output, it's fine for me.
The other one worked too, but then I tried to feed it with 42VAC and had a bit of smoke out of Q3, and now it doesn' t work.
Thanks
Anyway I had another 2 psus, one of them working nicely, fed with 21VAC and giving +42VDC output, it's fine for me.
The other one worked too, but then I tried to feed it with 42VAC and had a bit of smoke out of Q3, and now it doesn' t work.
Thanks
dirtyhanfri said:
+42 may be fine for you, but the specification is +48vdc +/-4v so it may not work for all mics.
dirtyhanfri
Well-known member
Yes, you're right,
But, what about all the gear out there with 24V phantom or even 12?
Anyway, I could use 30VAC transformer instead of 36, which I ASSumed would work
But, what about all the gear out there with 24V phantom or even 12?
Anyway, I could use 30VAC transformer instead of 36, which I ASSumed would work
