Simple Metal Detector Circuit Diagram

How Does Metal Detector Circuit Diagram Work? This circuit is a metal detector. It uses two RF Oscillators with 5.5MHz frequency. The first oscillator acts as a reference frequency produced by ceramic filter. The second oscillator produced by transistor T3. When metal...

Simple Voice-Controlled Flip-Flop Circuit Diagram

How Does Voice-Controlled Flip-Flop Circuit Diagram Work? This circuit acts as an on/off switch controlled by voice command. The maximum distance can be covered by the sensor is 4 metres. This simple circuit only uses two ICs, the LM324 and CD4027. Transistor T1-T4...

Simple Headphone Circuit Diagram

How Does Headphone Circuit Diagram Work? This circuit can be used as a headset for the home telephone by only using transistors. This circuit only needs small power it can paralleled with the phone. Transistor T1, Resistor R2,R3, and zener diode D6 used to lower the...

Simple Rain Detector Circuit Diagram

How Does Simple Rain Detector Circuit Diagram Work? This circuit serves as rain detector, so it produces sound as a warning alarm. This rain sensor is a simple circuit that only consists of winding wires. This sensor will work if the cable winding part exposed to...

Simple Siren with Single IC Circuit Diagram

How Does Simple Siren with Single IC Circuit Circuit Diagram Work? This circuit is built with one single IC loading one audio power amplifier, two transistors T1 and T2 which form basis of an astable multivibrator with variable frequency, and trimpot P1 is used to...