Monostable TTL (CB20797E)

This circuit, which can be used as a shield, has its time determined by RA and C connected at the input of the 555.

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Optical Receiver Shield (CB19865E)
Originally this circuit was indicated to be used in a garage door control, but it can be modified for...
400 Hz 741 Oscillator (CB17028E)
This conventional oscillator with the 741 can be precisely adjusted to produce a 400 Hz signal. The...
Variable voltage regulator (CB21192E)
This current-limited circuit was found in a Popular Electronics from the 90's. ...