Voltage-controlled oscillator (CB20831E)

This circuit is from American documentation from the 90s. The transistor is general-purpose and operational amplifiers can be modern equivalents.

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Audio limiter (CB7398E)
This circuit was found in documentation from the 1980s. It is powered by the audio signal that must...
Damped Oscillator LM108 (CB19097E)
Damped oscillators can be used to produce sound from percussion instruments such as the triangle, bell,...
IR remote control ON OFF test (CB7820E)
Found in Radio Electronics from the 90s, this circuit produces pulses to test an infrared...