power supply hum problem

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al
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power supply hum problem

Post by al » Fri May 31, 2002 12:26 am

i have a 0-600vdc 0-200mA solid state power supply, hums when i raise voltage with no load to 250vdc & above and hums noticeably with a load. I replaced can electrolytics with new computer grade, i had to replace with larger values, i.e. 300uF were replaced with 470uF same WVDC. Any ideas?

viveguy
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Re: power supply hum problem

Post by viveguy » Fri May 31, 2002 12:18 pm

The transformer may not have enough current available to keep the caps filled up.If you have a scope, check the output ripple.Be careful that you don't exceed the input voltage rating of the scope though.<p>AL

russlk
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Re: power supply hum problem

Post by russlk » Sat Jun 01, 2002 4:37 am

look for rivited or corroded connections. Resistance in the ground return will cause hum.

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