Free electronic circuit design and schematic diagram
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 […]
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Waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. Lets see its schematic diagram first, here it is: The core of this waveform generator is MAX038. This integrated circuit chip gives complete function to build a waveform generator/function generator. […]
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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: The time period for the output high is the same as regular configuration, t1 = 0.693 […]
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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 […]
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Sawtooth wave oscillator circuit can be implemented using several methods, here we present one design that employs 555 IC. Here is the schematic diagram of the circuit: The core of the circuit uses general 555 oscillator configuration, but instead of using a fixed resistor to limit the current for charging the capacitor, we use a constant current source. This change […]
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Stepper motor controller is needed to run a stepper motor, since a stepper motor cannot work by just connecting it to a power supply. To program a stepper motor to make a complex movement, we usually need a micro controller. Fortunatelly, for a simple movement like just rotating eith a constant speed, we can use avery simple circuit as described […]
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This testing instrument provide two alternate fuction: signal injector and signal tracer. This audio signal tracer/injector is very helpful in trouble shooting audio circuits, when you need to test a circuit by injecting a signal and observe the output (by watching the oscilloscope or by hearing the loudspeaker for example), or by tracing some points inside the circuit when an […]
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