Power-Op-Amp DC Motor Speed Controller

This is a video tutorial about DC motor speed controller using power op-amp. This video shows how to control dc motor speed using power op-amp. In this video the op amp is configured in non-inverting configuration. When the power supply is on, the LED will on and when the potentiometer is turned, the speed of dc motor will gradually increase. […]

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Voltage-to-Pulse Duration Converter

This is a circuit of Voltage-to-Pulse Duration Converter. This circuit is used to convert voltage into pulse duration by combining a timer IC and an OP Amp. This circuit can obtain accuracy up to better than 1%. The output signal is independent of the input voltage and still retain the original frequency. Here is the circuit: [Source: Philips Semiconductors Application […]

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Long Time Delays with 555 Timer

This is a Long Time Delays using 555 Timer. In 555 Timer, a function of charging rate of the external capacitor is the timing. This circuit needs expensive capacitors with extremely low leakage. Practically, the components limit the time between pulse to around twenty minutes. To get longer time periods, we can connect both halves in tandem with a “divide-by” […]

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Photocells (Photoconductive, Photodiode, and Photovoltaic) Amplifiers

The figures below show us about amplifiers for photoconductive (top),  photodiode (mid) and photovoltaic cells (bottom). Some voltage dependence of both speed and linearity is displayed by all photogenerators. If the cell terminal voltage is allowed to vary with cell conductance, the current through a photoconductive cell will not display strict proportionality to incident light. Functions of terminal voltages are […]

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LVDT Signal Conditioner Design Procedure (AD589-Single Supply)

LVDT (Linear Voltage Differential Transformer) need a complex excitation circuit and signal conditioning to work. Fortunately, Analog Devices provide AD598 for complete solution of LVDT signal excitation and conditioner to ease your life. AD598 can be operated in single supply mode, great for  battery-powered LVDT Application. Here is the schematic diagram of the circuit: The design procedur for determining the […]

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