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
Making Simple Buzzer circuit
This is buzzer circuit easy to build with small size,cheaper using normal transistor and small piezo speaker can use for 3V to 12V as use parts resistors[…] 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 Control Circuits with alarm, 19 seconds 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