900W H-class PA Amp with Limiter

Jump to Latest
andrewlebon

andrewlebon

R.I.P.
Joined 2008
under construction h class

to be tested with mjls hope it turns out good
 

Attachments

  • 82cc0fbd83117476.jpg
    82cc0fbd83117476.jpg
    144 KB · Views: 1,973
C

crazymechanic

Member
Joined 2009
no bias

Hi , could someone please help I finished one channel of h900 and iot went great but on the other one i have no bias voltage on both the PNP and NPN side of the output transistors.It shows aproximetly 0v I guess it should be something like 0.52 volts on the bases on the output trannies.

If someone of you could point me in the right direction.
Thanks:)
 
C

crazymechanic

Member
Joined 2009
bias

Hi again, well yesterday I got my readings wrong.The first channel do have 0.52v bias on output transistor bases, both sides.
The other channel shows like 0.2 volts on PNP and 0.18 v or something like that on the NPN side of the output transistors.Is this ok? should it be good or should I check something for being wrong?
Also do this amplifier has the signal ground and PSU ground tied together or are they seperate?
because all standart amplifiers have the signal and psu grounds together, I assume this should do the same but I cannot see it anywhere in the schematics shown.

Thank you for helping,
regards, Gīrts.
 
C

crazymechanic

Member
Joined 2009
bias

on the first channel the voltage across multiplier is 1.8 v on the second which is the faulty one the voltage there is like 0.9v over the mje 340.
what do you mean by the driver? I guess a transistor but which one?

Also , a stupid question but do I wire the signal ground to the powersupply ground in this amp or not, I'm a bit confused as usually signal gnd is wired to psu gnd.
 
You must log in or register to reply here.
Top Bottom