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Re: SillyAmp

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>>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

Reply to
John Larkin
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Bring it on! I'd love to see anything about parametric amplifers-- the only thing I can find on them is "they work by varying some part of the circuit"...drrrrr...okay...

Ceramic caps would be a very accessible way to demonstrate one.

Tim

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

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Reply to
Tim Williams

see if you can find anything on a "paraformer". Wanlass & Wanlass dreamed it up when I was an itch in my daddy's pants IIRC.

the trick was to get a tap-wound C core, and cut it in half, then rotate one half 90 degrees ?! The flux from one wouldnt couple to the other, but it would modulate the permeability....

Cheers Terry

Reply to
Terry Given

I couldn't make sense of that so I had a look.

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is probably what you were speaking about.

That one works because there's an additional *shared* piece of core (flat plate between both C halves) that sees the two orthogonal fluxes, hence it has its permeability modulated by one winding without influencing the other.

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Thanks,
Fred.
Reply to
Fred Bartoli

fun stuff eh Fred?

It was a long time ago I looked at the paraformer, but Im pretty sure it was as I described it. I was interested in magamps at the time....

Cheers Terry

Reply to
Terry Given

I've seen that applied to a toroid. Normal toroidal windings, with another winding across the outside of everything. The outside winding was supposed to reduce the permeability. I still don't know whether it was an April Fool's or not.

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Tony Williams.
Reply to
Tony Williams

My first thought was that they're related, but mag amps windings are coupled.

I still can't see how you can arrange 2 C cores halves to achieve permeability modulation.

I've posted on abse another arrangement that can be used with 2 identical 'C' cores. But the C is almost closed.

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Thanks,
Fred.
Reply to
Fred Bartoli

Tony Williams a écrit :

I've seen that too. A more effective way is to make the toroid hollow (for ex. 2 C halves used as the toroid section) so that both flux path are closed.

I've also seen, when searching about flux gates, some ways of making 3 orthogonal fluxes within one core. Can't remember what they were used for.

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Thanks,
Fred.
Reply to
Fred Bartoli

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