Battery Voltage Monitor circuits
The simple low voltage tester circuit using LM339,can use Battery voltage monitor for voltage sources that problems, by LED display and alarm sound. Read more
Electronic buzzer
Continuity tester circuit with Buzzer and LED
Create continuity tester circuit with buzzer and LED for check solder joint defects, not kill components on PCB, as probe gives tiny current and voltage. Read more
2 Simple Buzzer Circuit
This buzzer circuit is simple, small, cheap, and requires 3V to 12V. It only uses transistors, piezo or small speaker, and a few components. Read more
Simple time Delay Circuit using MOSFET
For learn about MOSFET. I recommend Time Delay circuit easy to make and long time and a few parts than normal transistor Read more
CD4060 Timer Circuit with alarm, 19S to 5 Hours
This is IC 4060 Timer circuit. When rises time that is set, Suppose set 5 minutes time. after all time to 5 minutes. the circuit will emit a sound of buzzer once. […] Read more