Delayed Pulse Generator (CB6470E)

This circuit was found in a 1967 documentation. The switch diode is a component of the time and is difficult to find today.

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500 ohms Audio Amplifier (CB13668E)
We found this audio amplifier stage with 500 ohms of input impedance in an old American...
Astable Timer (CB15017E)
In this circuit the 555 is configured as an adjustable timer for long intervals. The capacitor C1 can be...
Visit Announcer (CB23856E)
This simple circuit published in the November 1962 Radio Electronics magazine beeps when the light...