We found this circuit in the March 1992 issue of Radio Electronics magazine. The circuit has a range from 1.25 V to 1 kV. The formula for the voltage values is given.
This circuit uses a piezoelectric transducer to produce sounds like a buzzer. Frequency is...
This circuit was found in an Elektor from the 90s. Transistors are common and status indications are...
Found in an Electronic Design from the 90s, this circuit uses components from that time and can...