Relatively easy
Second switch connected to power resistor calculated to limit current to
1A or so this would discharge PS safely, This switch would close before
the shorting crowbar, The shorting crowbar would be left in place so
as to complete the discharge and serve as a last line of defense should
the soft crowbar fail.
Scott N1JIN
Pete Smith wrote:
> At 01:17 AM 2/13/2009, someone wrote:
>
>> I'd be the first to admit I could make a mistake.
>>
>> However, I can't for the life of me picture how this particular interlock
>> could save me.
>>
>> It seems to me that the psychology of this particular thing was to save
>> someone who was cluelessly taking this amp apart *while it was powered up* or
>> shortly afterward, before the bleeders drained the HV away.
>>
>> Every scenario I can think of that ends with me stupidly getting into the HV
>> while working on this amp wouldn't be affected by this interlock.
>>
>
> OK, here's an interesting design exercise - we need an interlock that
> *does* protect the operator and "doesn't* kill the power supply. How would
> you do it? Or can it be done?
>
> Otherwise, I'm inclined to remove the interlock on my SB-220.
>
> 73, Pete N4ZR
>
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