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.
We found this circuit in a 1992 magazine, but it can be easily assembled today because the...
This traditional configuration was found in a 1988 publication. Its gain depends on the base...
The power of this small amplifier reaches 75 mW per channel depending on the voltage and the load...