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 biestable touch circuit was found in American 1980s documentation. The circuit must not be...
This simple electronic toy organ produces an interesting sound, which can be used by the most...
This circuit is from an old documentation from 1995, but it can be easily assembled today by the...