by

Ciro Santilli (@cirosantilli, 35)

Electronic oscillator

Something where DC voltage comes in, and a periodic voltage comes out.

Oscillators: RC, LC, Crystal by GreatScott! (2015)

Source. Good video. Contains actual breadboard experiments on oscilloscope and circuit diagrams

youtu.be/eYVOdlK15Og?t=66 RC oscillator on breadboard. Produces rectangular wave. Mentions popular integrated circuit that does it: 555 timer IC.
youtu.be/eYVOdlK15Og?t=175 LC oscillators allows for higher frequencies. Produces sinusoidal output on MHz range. Uses an amplifier to feed back into input and maintain same voltage. Hard to make reliably on breadboard.
youtu.be/eYVOdlK15Og?t=315 crystal oscillator. Mentions it acts like an LC oscillators. Shows and equivalent model. Wish he had talked more about them. You need support components around it: similarly to the LC case, the amplifier is generally not packaged in.

Table of contents
- Relaxation oscillator Electronic oscillator
  - RC oscillator Relaxation oscillator
    - 555 timer IC RC oscillator
  - LC oscillator Relaxation oscillator
- Crystal oscillator Electronic oscillator

Relaxation oscillator

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RC oscillator

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First watch: Video "Oscillators: RC, LC, Crystal by GreatScott! (2015)"

555 timer IC

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LC oscillator

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Oscillator made of an LC circuit.

First watch: Video "Oscillators: RC, LC, Crystal by GreatScott! (2015)"

Crystal oscillator

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First watch: Video "Oscillators: RC, LC, Crystal by GreatScott! (2015)"

From Raw Crystal to Crystal oscillator

. Source. by United States Army Signal Corps (1943)

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