For a 30watt rms amplifier with a transformer like 2,5 amperes and
12-0-12volts secondary, what is the correct fuse value and type on 110volts?
and...theres difference when on 220volts?

Thanks
Ronaldo

Hi friends,
I'm in trouble with a project ground,
I have a PSU, preamp, poweramp and an effect at the same pcb.
I need to know the best way to ground all these subcircuits to
avoid noise and hum. May I use a star ground, getting all the ground
points in all subcircuits and group then at the chassis ground? The
same with the input and output jacks ground? I'm really lost in
this task, please help. Thanks a lot.

Take a look at the project components:


Link: http://blindsjc.v10.com.br/placas.htm

Ronaldo

Hi friends,
Someone knows about earphones output schematics or any other information.
I just finished a amplifier with a Tonemender and a TDA2050 but to get sound
directly from the preamp doesn't show good quality.

Every schematic that I know do not show a earphone connection. How the
big ones like Fender and marshall do this outputs?

again, sorry about the bad English.

Thanks
Ronaldo

Hi friends,
I'm using a "Tonemender" from RunOffGroove as a preamp im my project, it acts
as a preamp for a "TDA2050" (Datasheet Project) power amp. The problem is, i got
distortion at very low volume, a really ugly clipping and worst, my "TDA2050" burned
after 5 minutes. The PSU is working perfectly and provides 22-0-22 (at 4ohms speaker).

What I need to work? The preamp input? The preamp gain? The preamp out?
Something on the amp like the input impedance? Thanks in advance.

Sorry about my bad english.

Ronaldo