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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?
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).
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.
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