Direction Signal (CB25608E)

This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and powers an audible indicator.

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Compator with hysteresis (CB5079E)
This setting appears other times in this section from other sources. This is from an 80's American...
Digital Timer (CB17006E)
This digital timer provides timings from 1 minute to 10 hours with indication on a 3-digit...
RF Oscillator (CB490)
Signals from 27 MHz to 150 MHz can be produced by this one-transistor oscillator. The frequency...