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How to make a simple oscillator with transistor and Capacitor?

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sr13579

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I provided a circuit which should discharge at a specific time. But this circuit is not working as an oscillator. How should I make circuit which will give me oscillation?
 

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ChrisP58

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I don't know of a way to make an oscillator with a single transistor. But here is an example of a classic two transistor oscillator.

 

BobW

Active Member
The circuit in the first post might work as an oscillator if you replace the transistor with an SCR.
 

audioguru

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There is an oscillator that uses the reverse-biased emitter-base of a transistor that has avalanche breakdown like a Zener diode (the original schematic in this thread has a Zener diode).
Replace the LED with a speaker to hear it.
Change the value of the capacitor to change the frequency.
It will not work if the battery voltage is too low.
 

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Reloadron

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Getting a bit esoteric now aren't we? :D

It also seems fairly obvious that he's looking at audio oscillators, as far as I can recall (never having even seen one) tunnel diode oscillators were for microwave frequencies.
:) Actually Nigel the first tunnel diode oscillator I built was as a kid and maybe the early 60s. It actually ran in the 6 meter ham band or about 50 MHz. I do however agree I was on the esoteric side. OK, we will let it go with a unijunction relaxation oscillator. :)

Ron
 
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