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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Microphone preamplifier (CB8933E)
This circuit was obtained in a 90s documentation from Analog Devices. The sensitivity is in the...
Ultrasonic repellent (CB9384E)
Found in Radio Electronics from the 90s, this circuit is based on the 555 directly feeding a small...
Balanced Dual Modulator (CB4234E)
This dual balanced modulator configuration was obtained in a 1980s telecommunications...