Ticking noise on a switching PSU

K

karatron

New Member

• Apr 22, 2010

• #1

Hi. I have a problem with a switching PSU. It makes this fast ticking noise and my voltage detector (leds) turn on and off at the same frequency. The PSU supplies 15V, -15V and 5V. The led indicator for -15V blinks with this noise. Can somebody help me with this?

thanks

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Apr 22, 2010

• #2

Could be anything, either a failure to start and run (usually high-ESR electrolytics), or a short on the output shutting it down (output rectifiers are a common cause).

Can you post a circuit diagram?.

 

lavenatti

Member

• Apr 23, 2010

• #3

Do you have a load on it? I've had them do just that when no current is being drawn.

 

B

bountyhunter

Well-Known Member

• Apr 23, 2010

• #4

Most switchers have overload protection that shuts it off for a preset time out then tries to restart. A sustained overload will sit there and click at the frequency set by the "time out" circuit and the power supply will never start.

 

N

nike22

Banned (Temporary)

• Apr 25, 2010

• #5

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