This circuit from the 60's uses germanium transistors of the time. Listening is done on high impedance headphones.
In reality, it is an audio oscillator that is triggered by a structure that forms a bell-shaped sensor....
The maximum current of this Motorola LDO is 1 A. The formula next to the diagram makes it possible to...
This circuit uses components that are no longer easily found. The circuit is from a 1988...