>
>>Jim Thomps>>>
>>>>>> I thought about that last one as a replacement to the HV optos
>>>>>> when you first 'published' your idea here a couple of years ago.
>>>>>> But now that's 4 active parts. Well six, including the leds.
>>>
>>>> v+
>>>> |
>>>> |
>>>> r
>>>> |
>>>> +-----------out
>>>> |
>>>> | Supertex
>>>> d depletion-mode
>>>> in--/\\/\\---, g ---,
>>>> | s |
>>>> | | |
>>>> a c |
>>>> k ---> b |
>>>> | opto e |
>>>> | | |
>>>> gnd +-----+----- v-
>>>
>>>>> 3 parts total! And you can get low-voltage optos as duals, so
>>>>> you can make it full totem-pole, class B, 500 volts p-p out,
>>>>> with three parts!
>>>
>>>> Awesome. Don't forget a resistor for the opto.
>>>
>>>>> Apex, cry your heart out.
>>>>> John
>>>
>>> Another silly KYAG circuit ;-)
>>
>> ?? Really? KYAG? How so? ??
>
>Concern for opto NPN punch thru during power-up... I could go for a
>zener or some-such in there.
>
>> That looks like a relatively-well
>> behaved circuit, with excessive gain. But it does cry out for a
>> feedback loop.
>
>I've been musing really retro... maybe a mixed toob/silicon amplifier
>stage ;-)
>
> ...Jim Thompson
You want silly? How about a parametric amplifier using the nonlinearity of ceramic caps!
John