Found in a Motorola documentation from the 70s, this circuit makes use of transistors of the time. Modern equivalents can be used. The diode also supports an equivalent.
The resistors R determine the frequencies of the oscillator together with C. The circuit is from a...
This circuit can be used as shield or to drive powerful loads from low current switches such as...
Two of the four gates of a 4011 is used in this biestable touch circuit. Do not use a power source...