This circuit produces the sound of percussion such as blocks, drum, bell, etc. The frequency depends on the marked capacitors, which can have a wide range of values depending on the desired sound.
This car alarm was found in a 1965 General Electric manual. The SCR can be commonly used with the...
This voltage regulator was obtained in the SGS manual of linear integrated circuits of 1982. The...
We found this circuit in a 1974 documentation. The NPN transistor can be the BD135 and the PNP the...