Pressure switches are used in this circuit that quickly turns off the supply of a load if necessary. The circuit is from a 90s Popular Electronics.
This circuit of a few tens of milliwatts of power requires a single source. We found it in a Radio...
This circuit is suggested by Texas Instruments in his Optoelectronics Sourcebook. The transistors...
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...