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