switching power supply.. can't get -24v?

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#21
BScorner said:
Now I get -24v and +24 to the pcb but no sound.. gah... i wonder how i bridge the input of rca?
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Somewhere in the input stage of the amplifier there are connections for +IN and -IN. So connect the RCA inner and outer conductors to those, and to nothing else.

I am not familiar with that amplifier but from a schematic I found:

http://www.diyaudio.com/forums/pass-labs/111197-aleph-j-schematic.html#post1341101

it looks like you should NOT connect the RCA jacks to the chassis, or to ground, or to anything except the +IN and -IN points in the circuit (since the circuit has a differential input and -IN is separated from ground). So if that's true then you need isolated (insulated) jacks.
 
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#25
gootee said:
Somewhere in the input stage of the amplifier there are connections for +IN and -IN. So connect the RCA inner and outer conductors to those, and to nothing else.

I am not familiar with that amplifier but from a schematic I found:

http://www.diyaudio.com/forums/pass-labs/111197-aleph-j-schematic.html#post1341101

it looks like you should NOT connect the RCA jacks to the chassis, or to ground, or to anything except the +IN and -IN points in the circuit (since the circuit has a differential input and -IN is separated from ground). So if that's true then you need isolated (insulated) jacks.
Click to expand...

Thanks -- I will try this too! All I get a is a little thump when I turn it on
 
#26
can you confirm any other voltage from tis schm (especially across R8):

95832d1194116963-aleph-j-schematic-drawnasusual.jpg
 
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