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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Pulse Compressor and Expander (CB6658E)
Found in a 1967 Electronic Design, this transistorized circuit compresses and then expands a pulse....
Silencer (CB4197E)
This squelch is activated by its own noise, acting automatically. It is used in communications...
MA1026 Portable Digital Clock and Thermometer (CB24684E)
This is the battery-powered version of the previous circuit. The circuit is from the same Radio...