Troubleshooting PS...

sfox50 · « **on:** 13 Apr 2005, 10:44 pm »

Jim- I just hooked a shielded output to my power supply to try & eliminate hum, but now I've lost the -15v output. The + 15 is ok, & the LED is lit,of course. What should I check- the diodes?I assume the transformer is ok...Thanks..

hagtech · « **Reply #1 on:** 14 Apr 2005, 01:45 am »

Most likely the -15V supply is shorted to ground. Many people seem to do this. Disconnect your output cable and it will probably return.

jh

sfox50 · « **Reply #2 on:** 14 Apr 2005, 10:26 pm »

Jim- You nailed it!- the + and - seem ok now. ( Glad I'm not the only one!

) I want to separate the PS from the bugle to get away from other components, the hum was pretty loud.What would be good for a power lead(other than the two conductor + ground coax that caused this problem)?

hagtech · « **Reply #3 on:** 15 Apr 2005, 06:11 am »

I like to deliver power on twisted pairs. Not a tight twist, loose, maybe 1.5 turns per inch. Just like CAT5.

jh