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Guest

Wed Oct 17, 2018 8:45 pm   



Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael

Phil Hobbs
Guest

Wed Oct 17, 2018 9:45 pm   



On 10/17/18 3:33 PM, mrdarrett_at_gmail.com wrote:
Quote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael


The neon bulb thing only works because the bulb turns itself off
abruptly at low voltage, then doesn't turn on again immediately as the
voltage recovers. This hysteresis is why it works.

Other non-transistor, non-tube oscillators:

Electromechanical buzzers
Mechanical clock balance wheels
Coffee percolators
Baseball cards in bike spokes
Thermoacoustic refrigerators
Dog whistles
Ocarinas
Blowing over a beer bottle
Slinky going downstairs
Bay of Fundy
Internal combustion engine piston

Tunnel diode oscillator
SCR relaxation oscillator

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

David Snowdon
Guest

Wed Oct 17, 2018 9:45 pm   



Negative resistance spark gap ?

High frequency alternator ?
As I recall, Fessenden used a 100 KHz generator to transmit music and
voice in 1906.

David



mrdarrett_at_gmail.com wrote:
Quote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael


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Tom Gardner
Guest

Thu Oct 18, 2018 1:45 am   



On 17/10/18 20:33, mrdarrett_at_gmail.com wrote:
Quote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s


Tunnel diodes
Gunn diodes

jfeng@my-deja.com
Guest

Thu Oct 18, 2018 1:45 am   



masers
lasers
spin-torque oscillators

default
Guest

Thu Oct 18, 2018 2:45 am   



On Wed, 17 Oct 2018 12:33:19 -0700 (PDT), mrdarrett_at_gmail.com wrote:

Quote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael


When I was in high school I built this rather elaborate relay
oscillator to dial a pulse type telephone. One relay developed
pulses, another was rigged as a monostable to time the pulse train to
dial a particular number. A rotary stepper relay could read the holes
in cards and cycle through some crude punch cards to dial (worked but
not well)

Scr's can be made to oscillate, of course unijunctions, some negative
resistance diodes like tunnel/gunn, electro-mechanical toys using
magnets and leaf/reed switches or transistors to energize coils,
old-time magnetic earphones and carbon mikes to develop feedback,
tuning forks with feedback drivers, propagation delay devices, arc
lights, early radio transmitters that used motors driving many-pole
alternators, spark-excited Tesla coils...


Guest

Thu Oct 18, 2018 3:45 am   



On Wednesday, October 17, 2018 at 12:47:33 PM UTC-7, Phil Hobbs wrote:
Quote:
On 10/17/18 3:33 PM, mrdarrett_at_gmail.com wrote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael


The neon bulb thing only works because the bulb turns itself off
abruptly at low voltage, then doesn't turn on again immediately as the
voltage recovers. This hysteresis is why it works.

Other non-transistor, non-tube oscillators:

Electromechanical buzzers
Mechanical clock balance wheels
Coffee percolators
Baseball cards in bike spokes
Thermoacoustic refrigerators
Dog whistles
Ocarinas
Blowing over a beer bottle
Slinky going downstairs
Bay of Fundy
Internal combustion engine piston

Tunnel diode oscillator
SCR relaxation oscillator

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com



Ah ok, thanks. While I was at the university I was under the impression that one could create an oscillator with a combination of resistor, inductor and capacitor, but now I see most electronic oscillators require a transistor of some sort.

Michael

Jasen Betts
Guest

Thu Oct 18, 2018 6:45 am   



On 2018-10-17, mrdarrett_at_gmail.com <mrdarrett_at_gmail.com> wrote:
Quote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect


needs a gas discharge tube, spark gap, sidactor, tunnel diode, PUT, or
UJT etc - something with a negative resistance region, LED won't work.

Quote:
Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s


tesla coil. (and other spark gap oscillators)

car horn, dc electric bell (I guess these are really relay oscillators)

electric motor

hot-wire (wire heats up due to current and gets longer)
eg: automotive blinker unit

bimetallic (metal changes shape in response to heat from an electric
heat source)
eg: stovetop simmerstat

carbon microphone feedback (I guess this is an accoustically coupled
analogue relay oscillator)



--
Notsodium is mined on the banks of denial.


Guest

Thu Oct 18, 2018 6:45 am   



Old style doorbell or buzzer.

Tom Gardner
Guest

Thu Oct 18, 2018 10:45 am   



On 17/10/18 20:47, Phil Hobbs wrote:
Quote:
On 10/17/18 3:33 PM, mrdarrett_at_gmail.com wrote:
Hello,

What are some examples of oscillators which don't require transistors or
vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would
it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long
at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael


The neon bulb thing only works because the bulb turns itself off abruptly at low
voltage, then doesn't turn on again immediately as the voltage recovers.  This
hysteresis is why it works.

Other non-transistor, non-tube oscillators:

Electromechanical buzzers
Mechanical clock balance wheels
Coffee percolators
Baseball cards in bike spokes
Thermoacoustic refrigerators
Dog whistles
Ocarinas
Blowing over a beer bottle
Slinky going downstairs
Bay of Fundy
Internal combustion engine piston

Tunnel diode oscillator
SCR relaxation oscillator


And, of course, there are a range of purely chemical oscillators
As good a starting point as any is
https://en.wikipedia.org/wiki/Chemical_oscillator

jfeng@my-deja.com
Guest

Fri Oct 19, 2018 1:45 am   



On Wednesday, October 17, 2018 at 7:32:04 PM UTC-7, mrda...@gmail.com wrote:
Quote:
Ah ok, thanks. While I was at the university I was under the impression
that one could create an oscillator with a combination of resistor, inductor
and capacitor, but now I see most electronic oscillators require a transistor
of some sort.

Michael
The spin-torque oscillator is magic. It is a thin film structure with nanometer-thick layers of normal conductors, ferromagnetic materials, and antiferromagnetic materials. Apply a dc current, and it continuously produces microwave oscillations. No active gain elements or resonators are required.


Phil Hobbs
Guest

Fri Oct 19, 2018 2:45 am   



On 10/18/18 8:12 PM, jfeng_at_my-deja.com wrote:
Quote:
On Wednesday, October 17, 2018 at 7:32:04 PM UTC-7, mrda...@gmail.com wrote:
Ah ok, thanks. While I was at the university I was under the impression
that one could create an oscillator with a combination of resistor, inductor
and capacitor, but now I see most electronic oscillators require a transistor
of some sort.

Michael
The spin-torque oscillator is magic. It is a thin film structure with nanometer-thick layers of normal conductors, ferromagnetic materials, and antiferromagnetic materials. Apply a dc current, and it continuously produces microwave oscillations. No active gain elements or resonators are required.


There are also Gunn and IMPATT diode microwave oscillators.

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

John Larkin
Guest

Fri Oct 19, 2018 5:45 am   



On Wed, 17 Oct 2018 15:47:25 -0400, Phil Hobbs
<pcdhSpamMeSenseless_at_electrooptical.net> wrote:

Quote:
On 10/17/18 3:33 PM, mrdarrett_at_gmail.com wrote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearson-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael


The neon bulb thing only works because the bulb turns itself off
abruptly at low voltage, then doesn't turn on again immediately as the
voltage recovers. This hysteresis is why it works.

Other non-transistor, non-tube oscillators:

Electromechanical buzzers
Mechanical clock balance wheels
Coffee percolators
Baseball cards in bike spokes
Thermoacoustic refrigerators
Dog whistles
Ocarinas
Blowing over a beer bottle
Slinky going downstairs
Bay of Fundy
Internal combustion engine piston

Tunnel diode oscillator
SCR relaxation oscillator

Cheers

Phil Hobbs


Carbon microphone and speaker.

Pendulum clock.

Arc oscillator (once used for broadcast transmission)

Violin.

Clarinet.

Zener diode.

Gunn diode.

Fingernail on blackboard.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics

amdx
Guest

Mon Oct 29, 2018 3:45 am   



On 10/17/2018 2:33 PM, mrdarrett_at_gmail.com wrote:
Quote:
Hello,

What are some examples of oscillators which don't require transistors or vacuum tubes?

So far I found relay oscillators and the Pearso There n-Anson oscillator.

Does the Pearson-Anson oscillator require a high-voltage neon lamp, or would it work on LEDs as well?
https://en.wikipedia.org/wiki/Pearson%E2%80%93Anson_effect

Relay oscillators look neat too but I don't imagine they would last very long at high frequencies.
https://www.youtube.com/watch?v=WuG4nOyF99s

Thanks,

Michael


There used to be signs that used movement to get attention, it could
be as simple as a waving hand. The hand was setup as a pendulum and when
the battery was installed you could give it a push, this would close a
switch, energizing the solenoid and giving the pendulum a kick this
would also open the switch. The pendulum would go through its swing and
then come back and close the switch, repeating the cycle.
I searched but could not fid a sign or a circuit, but I'm sure there is
one somewhere online.
Variation of the relay oscillator.

Mikek

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Guest

Mon Oct 29, 2018 1:45 pm   



The vibrator in an old car radio. Not only does it oscillate without transistors or tubes, some rectify without diodes. A second set of contacts make for a synchronous rectifier.

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