Triggered Oscillator (CB21252E)

This trip switch circuit was found in a Popular Electronics from the 90's. The frequency basically depends on C1 and R1.

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Planar silicon light sensor (CB8323E)
This circuit, which uses a planar silicon sensor, is from a 1964 Electronic Design. The component...
Shield TTL (CB19761E)
This circuit is from 80's documentation. Operational equivalents can be used. The power source is 5 V...
Delayed Pulse Generator (CB25729E)
Delayed Pulse Generator This can be considered an "advanced" application where two 555 integrated...