Re: SG-SP1 Capacitor Charger Section

On Jun 14, 8:44 am, Sam Goldwasser <s...@xxxxxxxxxxxxxxxxxxx> wrote:
Louis Boyd <b...@xxxxxxxxxxxxxxxxxxxx> writes:
Will wrote:
Thanks for your reply. The only reason this crossed my mind in the
first place is I've had a difficult time finding the transformer
listed in SG-SP1 and SP4 (Stancor P-6011, 650v, 70mA. I didn't
exhaust every possible source but the usual suspectes turned up
nothing. Can you point me in the right direction?

A 650 volt transformer will charge a capacitor to the square root of two
times the rated rms voltage, in this case 650 * 1.414 = 919 volts using
a half wave or bridge rectifier.

I believe the normal operating voltage for the SSY-1 pulse forming
network is close to 900 volts.

Yes, in fact, 900 V is probably somewhat high for long life.

I really should add a Variac to that schematic....

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As luck would have it I do have an old Metro Logic HeNe laser
somewhere packed away. I'll see if I can dig it out. You mentioned
it would work if it had a "shutoff circuit". Is there an example in
the FAQ anywhere or elsewhere?

Again, thanks for everyones input.....
-W

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