This circuit was obtained from an old American documentation, and practically any general-purpose transistor and sensitive relay can be used according to the supply voltage.
This circuit, which uses a planar silicon sensor, is from a 1964 Electronic Design. The component...
This circuit is from 80's documentation. Operational equivalents can be used. The power source is 5 V...
Delayed Pulse Generator This can be considered an "advanced" application where two 555 integrated...