Ultrasonic Proximity Sensor (CB21312E)

This circuit was found in a Popular Electronics from the 90s. The circuit uses a ceramic capsule as an emitter and detector.

Low Distortion Oscillator (CB14622E)
With the components indicated, the circuit oscillates at 20 MHz. The coils and capacitors can be...
Triggered Monostable (CB15873E)
The trigger shown in the figure, built around a 4093 can generate pulses that reach 1 hour with a...
Positive Ramp Generator (CB13450E)
This circuit was obtained in an old American documentation, remembering that the 566 is the double...