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Variable-frequency oscillator - WikiMili, The Best ...
https://wikimili.com/en/Variable-frequency_oscillator#:~:text=A%20variable%20frequency%20oscillator%20%28%20VFO%29%20in%20electronics,the%20frequency%20to%20which%20the%20apparatus%20is%20tuned.
A Variable Audio Frequency Oscillator Using Op-amp 741
https://bestengineeringprojects.com/a-variable-audio-frequency-oscillator-using-op-amp-741/
The circuit of variable audio frequency oscillator using op-amp 741 is mainly a Wein Bridge oscillator whose frequency is varied using the gang condenser. While using the IC 1 741 (operational amplifier), the use of split power supply has been avoided by using capacitors C 1 and C 2, for R 4 *, a 150-Ω resistor, we can use thermister or even a bulb which control the …
Variable Frequency Oscillators (VFOs) - QRP ARCI
http://www.qrparci.org/wa0itp/chap10.pdf
Variable Frequency Oscillators (VFOs) It won’t be long before you become frustrated with being stuck on one crystal controlled frequency. You would like to have a frequency-tuning knob that covers the entire band and not just a few kilohertz. This sounds simple, but isn’t. It’s hard because, without the stability of a
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