undamped vibrating circle

Peet19 · Jul 29, 2022

I want to build an undamped vibrating circuit. I would like some help with this.
The picture shows how far I've come, but it's not good that way.
Thanks for the help!

Nigel Goodwin · Jul 29, 2022

To be undamped you need no load on it - you have (roughly) a 1K load, the resistor in series with the low impedance of the pulse source.

You need some kind of switch feeding the tuned circuit, that goes O/C when turned OFF.

danadak · Jul 29, 2022

Here is a 1/2 uS current pulse into an ideal LC tank circuit.

Regards, Dana.

Peet19 · Jul 29, 2022

I understand that it has to be fed back from the output, but how? How do they make radio transmitters?
Thanks to you too Dana.

Nigel Goodwin · Jul 29, 2022

Peet19 said:
I understand that it has to be fed back from the output, but how? How do they make radio transmitters?

That would be an oscillator, there are a wide variety of different types.

Papabravo · Jul 29, 2022

Your research should include:

Colpitts Oscillator
Pierce Oscillator
Hartley Oscillator
Armstrong Oscillator
Crystal Oscillator
RC Phase Shift Oscillator
Cross-Coupled Oscillator
Dynatron Oscillator
Meissner Oscillator
Optoelectronic Oscillator
Phase Shift Oscillator
Wine Bridge Oscillator
Robinson Oscillator
Tri-Tet Oscillator
Quadrature Oscillator
Bubba Oscillator
Van der Pol Oscillator

That should occupy your waking hours for a while

Peet19 · Jul 29, 2022

Papabravo: OK, thanks

Nigel: What oscillator is in the picture? How is the feedback implemented so that the output frequency has a constant amplitude?

Nigel Goodwin · Jul 29, 2022

Peet19 said:
Papabravo: OK, thanks

Nigel: What oscillator is in the picture? How is the feedback implemented so that the output frequency has a constant amplitude?

I'm not sure what type of oscillator that is, but it's the usual crappy 'bug' type transmitter - there's also no feedback to specifically cause a constant amplitude.

The actual feedback is from collector to emitter, with the transistor operating in common base.

Peet19 · Jul 29, 2022

Yes, I noticed that too. I didn't understand that there was feedback here.
I'm trying the Hartley oscillator.

Tony Stewart · Jul 29, 2022

You should learn the equations of impedance, resonance, Q and gain and run at lower frequencies 1st

https://tinyurl.com/24rzxk7z

Peet19 · Jul 31, 2022

I understand, thanks.

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