Ultrasonic remote control transmitter (CB8397E)

Found in a 90s Popular Electronics, this circuit excites a 40 kHz ultrasonic transducer. The transistor can be a BD135 or other medium power.

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Square Signals 555 Astable (CB1296E)
This configuration is traditional and can be found in many other circuits in this section. The...
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The purpose of this circuit is to monitor the output voltage of a power supply. The under and over...
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With the circuit shown, when the brightness of one lamp decreases, that of the other increases. There is...