Resistance Thermometer Current Loop Transmitter

Resistance temperature sensor (RTD, resistive temperature device)  comes in NTC (negative temperature coefficient) and PTC (positive temperature coefficient) forms. A schematic diagram below show a signal conditioner circuit for such thermometer. This sensor conditioning circuit works in current mode (current loop) and the amplifier inside gives a current output that is  inversely proportional with the sensor’s resistance. This temperature transmitter […]

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Fuzz Box (Distorion Pedal) Electric Guitar Effect

The two transistors amplifies the input signal from electric guitar. The two  silicon diodes (any small signal type can be used)  clips the amplified signal to produce a  highly distorted output, after filtering the high frequency component using a 500 pF capacitor. The amount of the fuzz is adjustable from maximum fuzz to pure clean (normal playing). This guitar effect […]

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F/V Converter in CLosed Loop Motor Speed Control System

Closed loop or servo system has the ability to stabilize the controlled plant at a specified operating condition. The plant, the controlled sub-system, can be any form of controllable system. In motor control system, the plant is off course a motor. The basic principle of automatic control mechanism in motor control is by monitoring the real speed of the motor, […]

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4-20mA Current Loop Bridge Sensor Transmitter

Bridged resistive sensing elements is common in resistive type sensors/transducers. This sensor type need a biasing voltage to operate. LM10 provide low reference voltage, which is suitable for powering usually low resistance bridge type sensors such as strain gauges. The reference voltage is not only supply the power to the bridge but also provide offset to set the output at […]

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