[Amps] Solid state relays..again

[Roger (K8RI)]

On 2/11/2014 2:34 PM, John K Gotwals wrote:
>> Sounds like my old 50A Astron. Big transformer and rectifiers. Pass
>> transistors for a regulator.  Once in a while that thing turns on with a
>> WHummpppp and a low frequency ringing that just trails off.
>
> My guess is the noise has to do with the hysteresis loop of the
> transformer core and where on the loop the power supply was at turn-off

I have no idea as to the width of the bh curve, but what I remember from 
magnetics and transformer theory if the hysteresis loop is wide, and the 
on time is at the opposing point on the curve  that initial magnetizing 
current pulse could be a whopper.

73

Roger (K8RI)


> and the following turn-on.
> John, N9JG (john at gotwals.com)
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