Class AB amplifier

Are you looking for a bridged output using all NPN's HV transistors by any chance?

I did something like that years ago for a beam deflection circuit on a Irradiation circuit. We didn't use HV transistors in that circuit how ever, It could be applied here. It was a bridged output using all NPN's (4). Inverted drivers to isolate the HV for the low voltage OP-AMPS we were using. In our circuit, we were only dealing with 80 Volts but the Op-amps could only handle 36 max. Feed back was voltage divided and the (+) input was offset a bit from the norm to compensate for that division factor.

One op-amp to drive the source NPN side while the other referenced the source driver side in a voltage comparator mode to drive the sink NPN output. 2 sets of these joined with a phase split circuit to drive the magnetic coils.

That's a general run down, I would have to dig out the print and scan it if there is any interest.

P.S. If did run a little warm :)

The worst was a neon sign transformer-1B3 rectifier-oil cap bank for a flashtube, charging to just under the spontaneous breakdown level, 7-8 KV maybe. The abuse level - high filament voltages to get fast charging - must have been extreme. It never failed, after maybe a year of moderate use.

I was a weird kid.

John

I was thinking of the 8068. I think.

John

Hmm, looks like a 6L6 (or rather, 6BG6, being the octal, plate cap style of that design).

Interesting that it's specified for high voltage!

Tim

-- Deep Fryer: A very philosophical monk. Website @

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The schematic on P2 shows a higher speed circuit which supports 50us scans it looks like...

Simon Burley snipped-for-privacy@privacy.net posted to sci.electronics.design:

There are such things as slow-scan scan converters. It must be over three decades ago, that i last heard of trying to output slow scan directly to a CRT.

Tim Williams snipped-for-privacy@gmail.com posted to sci.electronics.design:

Not quite, that is 1 Watt.

Well, how close to the positive rail would you want it to swing?

Do the math.

John

"Simon Burley" skrev i en meddelelse news:4757efc7$0$8418$ snipped-for-privacy@news.zen.co.uk...

Maybe a differential amplifier output stage? Similar to the one a bit down the page here: