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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Dwell Meter (CB4961E)
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...
Tolerance Indicator For Capacitors (CB4650E)
The basic idea of this circuit is to indicate the tolerance of a capacitor by reference to a...
Multitester (CB3834E)
This simple multitester tests continuity, semiconductors, leaks, and other common component...