Found in a Popular Electronics from the 90s, this circuit uses components that are still current. The circuit triggers the vehicle's horn. The sensors can be increased in number.
This Set-Reset (RS) flip-flop uses an integrated 4001 or 4011 in addition to some external...
This is a high efficiency version with the MC723 which is the Motorola version for this well-known...
This circuit generates rectangular and triangular signals up to a few megahertz. The circuit is...