Locked relay shield (CB8837E)

This interesting configuration was found in a 1965s Electronic Design. It makes use of components of the time.

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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...