Re: (audio) "PA amp"?
From: Mike Page (mike_at_SCRUBeclectic-CAPSweb.BLAMEco.SWENuk)
Date: 10/10/04
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Date: Sun, 10 Oct 2004 15:38:16 +0100
Pooh Bear wrote:
>
> Mike Page wrote:
>
>>I made the mistake of capacitively coupling the LV winding of a booster
>>transformer to avoid potential DC saturation currents. I blew several
>>fuses. I never bothered to analyse why, but replaced the caps with
>>smallish resistors, which kept the DC current to adequate levels.
>
> Maybe you made a resonant load ?
>
> Graham
It didn't happen every time, seemed to have been more of a startup
problem. I didn't have a bleed across the caps, so I guess they could
have got biassed more than the 100mV expected (due to transformer inrush
or something) and run the output stage in partial class A. Anyway .. it
was only a bit of test gear and not worth making perfect. All I wanted
was 500V at low distortion into 3M or so. Now we have a calibrator, but
the frequency control is not too clever.
Regards,
Mike.
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