This 1968 circuit makes use of MOSFETs of the time. The circuit can be mounted based on modern common FETs. Observe the high supply voltage.
This circuit uses a Hall device from that time as a sensor. The circuit is from an English...
Found in Radio Electronics from the 90s, this siren finds many variations on this site. The...
This audio generator that produces both rectangular and sinusoidal signals was found in a...