Metronome is very important tool if you studying music playing. There are mechanical metronome device in the past, but today, electronic metronome is much more popular since it can be very simple, compact/small, reliable, and also has the most interesting feature: cheap. Here is one example of the electronic metronome schematic: Read Full Story

A phase control circuit can be used to control the power delivered to an AC load. The phase control circuit control the AC waveform, cutting the cycle to give full cycle, half cycle, zero cycle, or somewhere in between. You can say this circuit is similar to a dimmer circuit, but the switching is synchronized with the zero crossing of the waveform. Read Full Story

This sine wave generator is adjustable between 15 Hz to 150 kHz. The circuit is basically a Wien-bridge oscillator, with multiple capacitor selection. Here is the schematic diagram: A stereo 10k potentiometer is used to control the frequency. The dashed line connecting these two potentiometers show that both potentiometer has single axis. Possibly Related Articles:High Frequency Waveform GeneratorWaveform generator is very useful in electronic experiment and design. This circuit generate si... Read Full Story

This capacitance meter circuit is similar with previous meter circuit, but it uses transistors rather than logic gates. Here is the schematic diagram: You can see the circuit uses pnp transistor, you can use almost any pnp transistors with frequency bandwidth og 100MHz and collecttor current handling capability of 100 mA to replace the transistor if you can find the exact type as shown in the schematic diagram. Possibly Related Articles:Capacitance MeterCapacitance meter can be very helpful... Read Full Story

This lead acid battery charger circuit design is very simple and smart.  I call it a smart battery charger design because it uses only few components to support many features.  Here is the schematic diagram of the circuit: Read Full Story

Controlling the speed of three phase ac motor is done by controlling the frequency of the power line supply,  since the motor is synchronized with the line frequency. Three phase ac motor speed controller is actually nothing more than three phase sine wave power inverter with variable frequency. The three phase power inverter is a complex circuit, but fortunately there is an integrated circuit chip for this purpose. Here is the schematic diagram of the controller circuit: Read Full Story

Free Circuit Diagram FreeCircuitDiagram Articles Search Custom Search Home About Privacy Policy Contact Us Recent Articles 555 IC Oscillator with 50% Duty Cycle Water Level Controller Sawtooth Wave Oscillator Using 555 IC Simple Stepper Motor Controller Sections Audio Basic Function Circuits Control and Monitoring Data Communication Lighting Power Supply RF Testing and Measurement Sponsored Links TopicsAdapter Adjustable Power Supply Antenna Booster A... Read Full Story

A square wave oscillator using 555 IC can be configured to give symmetric oscillation (50% duty cycle). Other circuit uses diodes to split the charging and the discharging paths through different resistors, but here we need no such diodes. Here is the schematic diagram: Read Full Story

Water level controller circuit described here control the water level inside a tank. There two modes available with this water level controller circuit. The first mode is empty mode, when the controller will drain the tank if the water level reach the upper limit, the pump will be used to suck the water from the tank until the water level drop below the lower level. The second mode of this water level controller is fill mode. Here the pump will be used to fill the tank with the water when the... Read Full Story

Free Circuit Diagram FreeCircuitDiagram Articles Search Custom Search Home About Privacy Policy Contact Us Recent Articles High Frequency Waveform Generator 555 IC Oscillator with 50% Duty Cycle Water Level Controller Simple Stepper Motor Controller Sections Audio Basic Function Circuits Control and Monitoring Data Communication Lighting Power Supply RF Testing and Measurement Sponsored Links TopicsAdapter Adjustable Power Supply Antenna Booster Audio... Read Full Story