>
>Phil said:
>
>>Looks really close to me, Jim.
>
>Thanks, Phil. I penciled in a 12V 50W zener for use at
>3900V, but haven't gotten anything off paper yet. I'm also
>fiddling with a silicon bias switch and regulator combo, but
>have a ways to go. I like Rich's optocoupler idea, but am
>a little nervous about a high VCEO on the coupler when switched
>off.
/ ref. Fig. 7 on my Web site/
The potential across the optocoupler (Q2) and the bias switch transistor
(Q1) is typically <25v at cutoff/Rx and <1v during Tx. Q1 is rated at
100v. Q2 is rated at 80v. Both are protected by D1, a 51v, 1500w-pk
surge suppressor. During a maxi-glitch, D1 may short - thereby
protecting Q1 and Q2. A replacement D1 is $1.20. A spare D1 is supplied
with our high speed switching kit, p/n 47, $11.
>...
cheers, Jim
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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