Pulse Scrambler (CB20547E)

This circuit assumes that a pulse produced by S1 has a constant duration determined by R1 and C1.

Visible light transmitter (CB7852E)
This modulated light transmitter was found in a 90s Popular Electronics. In place of the lamp with...
Tuning Fork (CB205E)
The circuit shown here produces a pure square tone of 440 Hz that is suitable for musical...
Insect Repellent (CB4413E)
This circuit of an old publication produces the insect-like noise that drives them away. The...