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 small signal amplifier circuit was found in Motorola's 1969 documentation. The FET and the...
We find this circuit in an old American manual from the 80's. The circuit has a memory that keeps...
This circuit was found in a Radio Escuela Gráfica magazine from Argentina published in the 70's....