Why does my 8-turn inductor and 1μF capacitor not oscillate?

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152 replies · 10K views
Baluncore said:
Can you hear the oscillator as a silent frequency on the AM radio ?
Yes, at last! It's between 600 and 800, somewhere in between, see for yourself where the slider is:
IMG_20241004_134438.jpg
 
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LTspice simulation of your circuit shows that the 1 uF emitter capacitor, C3, seems to pull the frequency up, closer to 1 MHz than the expected 700 kHz.

If you move the AM radio further from the oscillator, you should get a more accurate frequency reading on the smaller signal.
 
Baluncore said:
LTspice simulation of your circuit shows that the 1 uF emitter capacitor, C3, seems to pull the frequency up, closer to 1 MHz than the expected 700 kHz.

If you move the AM radio further from the oscillator, you should get a more accurate frequency reading on the smaller signal.
If I place the AM radio 1 centimeter away from the inductor or from the antenna, the 700 KHz frequency goes completely silent. Otherwise, the noise reduces in intensity but not completely. The antenna does not have the right length to emit at a large distance. Half a meter away the noise reappears. It also silences 1400 KHz.
 
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