The circuit uses operations that are no longer common nowadays, as it is a configuration obtained in the Linear Applications Handbook of the National Semiconductor of 1994.
This interesting source of very low voltage for reference finds applications in the...
This sonic switch, sound relay or simply vox uses a medium impedance speaker as a microphone. The...
Using red LEDs with ignition voltages of the order of 1.5 V we can make a multiple voltage...