Pearl Phono Problem -- Need Help!!!

Mikelo · 4th April 2004, 07:46 PM

I built the external power supply with about 40VDC output as suggested in the manual, and that's what I measure in both channels when they are not hooked-up.

But when I hook-up the outputs to the phono boards, I measure only 8VDC, and this on both boards!

If I connect only one channel, I get a higher reading (9.2VDC) and strangely enough the other unconnected channel has an output of 10.1VDC at the external ps output.

I have connected the ps and signal grounds per the old instructions. The signal inputs and outputs are still unconnected.

I hope someone will be able to help

ingvar ahlberg · 4th April 2004, 08:35 PM

Hi
Seems like current limiting, are You shure everything in the psu is connected right? As it shows on both supply channels even thoug only one is loaded it must relate to something that is common for both. Transformer ofcourse but seems to big a drop for beeing that.
Could You draw Your psu up exactly as it is and post?

Mikelo · 4th April 2004, 09:38 PM

Thank you very much for pointing me into the right direction, (namely to my stupidity).

I filtered the AC line with 4.7K resistors instead of the 4.7 that
are called for. That would limit current.

Michael

4th April 2004, 07:46 PM	#1
Mikelo diyAudio Member Join Date: Feb 2004 Location: Colorado	Pearl Phono Problem -- Need Help!!! I built the external power supply with about 40VDC output as suggested in the manual, and that's what I measure in both channels when they are not hooked-up. But when I hook-up the outputs to the phono boards, I measure only 8VDC, and this on both boards! If I connect only one channel, I get a higher reading (9.2VDC) and strangely enough the other unconnected channel has an output of 10.1VDC at the external ps output. I have connected the ps and signal grounds per the old instructions. The signal inputs and outputs are still unconnected. I hope someone will be able to help

4th April 2004, 08:35 PM	#2
ingvar ahlberg diyAudio Member Join Date: Feb 2004 Location: Kungsbacka on the Swedish westcoast	Hi Seems like current limiting, are You shure everything in the psu is connected right? As it shows on both supply channels even thoug only one is loaded it must relate to something that is common for both. Transformer ofcourse but seems to big a drop for beeing that. Could You draw Your psu up exactly as it is and post? __________________ Ingvar

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4th April 2004, 09:38 PM	#3
Mikelo diyAudio Member Join Date: Feb 2004 Location: Colorado	Thank you very much for pointing me into the right direction, (namely to my stupidity). I filtered the AC line with 4.7K resistors instead of the 4.7 that are called for. That would limit current. Michael

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