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24th November 2006, 11:54 AM
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#1 |
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diyAudio Member
Join Date: Aug 2006
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Need some advice for tuning a Stevens DC-AC Chopper
I try to fix an old µVmeter following the DC supply there is an DC-AC Chopper. Two trim pots on the DC supply are changing the "song" of the chopper, Informations are missing me.
Anybody remembers those choppers ? What's their normal frequency of operation ? the Chopper seems to be a dual one, a trimpot for each half ? This thing is noisy near the manner of a rat repeller but at lower frequency, is it normal ? Any advice is welcome. Thanks PS: the noise is exactly the same with load unconnected.
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