The circuit presented was obtained in a technical documentation from National Instruments. The low-consumption circuit supplies a common LED with a voltage of just 1.5 V.
Found on 90's Popular Electronics, this circuit triggers when the microphone picks up a sound. The...
Found in a publication from the 60's, this circuit uses the CK722, germanium transistor of the...
This simple circuit can use any general-purpose transistor. The power supply must be isolated. The circuit...