Magamp oscillator

Is it at all possible to build an oscillator entirely from
non-linear magnetics (OK, solid state diodes are allowed)?

	Best regards, Piotr

On a sunny day (Tue, 3 Nov 2015 11:45:33 +0100) it happened Piotr Wyderski
<peter.pan@neverland.mil> wrote in <n1a38d$sbh$3@node1.news.atman.pl>:

>Is it at all possible to build an oscillator entirely from
>non-linear magnetics (OK, solid state diodes are allowed)?
>
>        Best regards, Piotr

Transductors.. have gain, so why not?

Solid state diode -> tunnel diode, not much else needed.

On Tue, 3 Nov 2015 11:45:33 +0100, Piotr Wyderski
<peter.pan@neverland.mil> wrote:

>Is it at all possible to build an oscillator entirely from
>non-linear magnetics (OK, solid state diodes are allowed)?
>
>	Best regards, Piotr

Magnetic amplifiers are conventionally effective in an AC environment
- the power source is already 'oscillating'. Such a circuit can be
made to be unstable to oscillate around the original conditions.

With a DC supply, you'd need the initial transient application of
power to 'start' the circuit, which, from a theoretical point of view,
is cheating. If forced to stop cold, it would not restart oscillation
without temporary removal or reapplication of power.

The suggestion of a tunnel diode is one that introduces an external
'starting' oscillator. Remove the magnetics and it will still
oscillate. There may be other ways to externally induce a magnetic
circuit to oscillate from a static DC condition. In some environments
this might be satisfactory.

RL
  

legg wrote:

> Magnetic amplifiers are conventionally effective in an AC environment
> - the power source is already 'oscillating'.

Hence my question, whether it would be possible to build an all-magnetic 
circuit.

	Best regards, Piotr

On Tuesday, 3 November 2015 14:31:10 UTC, Piotr Wyderski  wrote:
> legg wrote:

> > Magnetic amplifiers are conventionally effective in an AC environment
> > - the power source is already 'oscillating'.
> 
> Hence my question, whether it would be possible to build an all-magnetic 
> circuit.
> 
> 	Best regards, Piotr

so derive your ac with a spinning magnet/coil.


NT

tabbypurr@gmail.com wrote:

> so derive your ac with a spinning magnet/coil.

Yes, an Alexanderson alternator would be an option. :-)
But how about a circuit without any moving parts. Doable?

	Best regards, Piotr

On Tue, 3 Nov 2015 15:53:56 +0100, Piotr Wyderski
<peter.pan@neverland.mil> wrote:

>tabbypurr@gmail.com wrote:
>
>> so derive your ac with a spinning magnet/coil.
>
>Yes, an Alexanderson alternator would be an option. :-)
>But how about a circuit without any moving parts. Doable?
>
>	Best regards, Piotr
>

If you mean a DC powered circuit that oscillates using only passive
parts and diodes, no relays or such, I've never seen it done. Except
tunnel or some other negative-resistance diode.

John Larkin wrote:

> If you mean a DC powered circuit that oscillates using only passive
> parts and diodes, no relays or such, I've never seen it done.

I'm not sure if you can call a magnetic amplifier a passive part.
It can exhibit admirable power gain, but needs to be powered by AC,
for example:

http://sparkbangbuzz.com/mag-audio-amp/mag-audio-amp.htm

The guy claims it has the gain of 2000. So recently, I have
started to wonder if you can use such a device as a DC-powered 
oscillator. I agree, the answer "yes" would be a surprise, but
maybe it is "yes" indeed?

	Best regards, Piotr

On a sunny day (Tue, 3 Nov 2015 15:31:04 +0100) it happened Piotr Wyderski
<peter.pan@neverland.mil> wrote in <n1agf9$dki$1@node1.news.atman.pl>:

>legg wrote:
>
>> Magnetic amplifiers are conventionally effective in an AC environment
>> - the power source is already 'oscillating'.
>
>Hence my question, whether it would be possible to build an all-magnetic 
>circuit.

DC motor...
:-)

Jan Panteltje wrote:

> DC motor...

And, in fact, it is a correct answer. Yes, it can be done that way.
Now try without movables or argue it's impossible. :-)

	Best regards, Piotr