Ultrasonic repellent (CB9384E)

Found in Radio Electronics from the 90s, this circuit is based on the 555 directly feeding a small tweeter. An amplifier stage can be added.

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Programmable Sequential (CB18156E)
This circuit works with small 5 V incandescent lamps but can be modified to operate with LEDs. The...
Photodiode amplifier (CB6862E)
Found in Linear Technology documentation from the 90s, this circuit uses an operational amplifier...
Unijunction Audio Oscillator (CB930E)
The tone produced by this circuit depends on the capacitor and the adjustment of the...