LED Indicator for 220V AC Mains

This is the schematic diagram of LED indicator for 220V AC Mains which can be used to indicate that the cable lines is connected to 220v electrical installations. The current through the LED is not limited to the resistor, but the capacitance of the capacitor. The capacitance can be selected so that the current passing… Read More »

12 Stage Water Level Indicator

The is a simple and versatile 12 stage water level indicator circuit which will show you the current water level in the tank. This circuit can be used for general purposes. This circuit generates an alarm when the water level is below the lowest level of L1 and also when the water just touching the… Read More »

Metronome Sound Generator

This is the electronic circuit diagram of metronome sound generator. The circuit featured adjustable volume and beats/minute with potentiometers. LED used to be a beat indication. The circuit powered with 9V DC voltage, a 9V battery can be used to operate this metronome circuit. This circuit designed by Velleman. Metronome Sound Generator was last modified:… Read More »

Indicator Circuit for Mains 220V Blown Fuse

This is indicator circuit to indicate that there is blown fuse, it will show the condition of fuse through LEDs.. This circuit works for fuse 220V mains. This compact circuit is very useful and reliable. It is a low cost circuit which use very few components. Generally, when an electronic device indicates no power, the… Read More »

Electronic Quiz Button Table

This is the circuit diagram of electronic quiz button table. This circuit is simple, easy to built and of course it is not expensive. This quiz circuit used for four game participants. It determines the contestant who first presses the switch (S1 through S4) to answer a question and locks out the remaining three entries… Read More »

2000W Class AB Power Amplifier

This is the circuit diagram of 2000W class AB power amplifier uses 7 pairs MJ15003 and MJ15004 transistors for the final amplification block. The circuit operated with 90V DC symmetrical (dual polarity) power supply circuit. The transistors must be mounted on heatsink to prevent the overheating, maintain the transistors work in maximum performance. 2000W Class… Read More »

Power Amplifier 2000 Watt

This is linear power amplifier 2000 Watt which need advance knowledge in electronics since the schematic diagram is very complex for hand made circuit. I think you have to re-design the schematic diagram using circuit diagram software designer such as diptrace, eagle, expresspcb ect. Or just order the PCB online, they will be glad to… Read More »


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