Simple Signal injector circuits using transistors
This is simple signal injector circuit, used two transistors join together as astable multivibrator, signal output frequency 1,000Hz in square wave form.[…] Read more
Meters & Detectors
Simple Motion Sensor Alarm Circuit Diagram
You have a private area, right? If you have this motion detector alarm circuit. It will reduce your worries. Imagine a big bear is coming to the behind of your house. Then, the siren alert. The big bear is shocked and runs away. You and your family are safe. Is it great? Read more
Ghost Detector Static Charge Monitor by Lennie
This is a Ghost Detector circuit or Static Charge Monitor circuit by Lennie. The Label was printed on card stock; clear coated with light coats of spray enamel; cut, and attached down a tomato paste can. This article was copied from Lennie Zink’s article. Apichet GaraipoomI love electronics. I have been learning about … Read more
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
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