Mini FM Transmitter
This is a mini fm transmitter circuit. I think this is the simplest one. Simple, easy and of course... inexpensive...…
Electronic Buzzer with IC timer NE555
This easy electronic buzzer circuit built based on timer works for gaining the frequency. The IC timer NE 555 used…
Emergency Light + Alarm
This is the circuit diagram of emergency light included the alarm circuit to show you that there is no power…
Low Noise Portable Mic Preamp
This is the circuit diagram of portable mic preamp. This circuit consumes low current supply (about 2mA), so will have…
HiFi Audio Pre-amp
This is a HiFi pre-amplifier circuit diagram with low noise output. Very wide range frequency from about 10Hz until up…
4W Audio Amplifier using Transistor TIP41
This 4W Audio Amplifier circuit is powered by 2 pieces of transistor TIP41. The circuit is very simple and incorporates…
“Hum” Remover
Here is the hum remover circuit diagram. "Hum" usually occured from live audio system, for example: input from microphone. Hum…
10 Dancing LEDs
This is the circuit diagram of dancing LEDs which consists of 10 units LEDs. The 10 dancing LEDs circuit works…
Dual Output Stabilized Power Supply
This is a dual regulated and stabilized power supply, usually used to supply amplifier circuit, it also known as split…
Ultrasonic Sensor Switch
Here is the circuit diagram of ultrasonic sensor switch. There are many methods of wireless switching such as by using…