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thankz
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example of a varible capacitor input op-amp to voltage level circuit.
I'm not sure how to turn reactance to a voltage level using an op-amp?
I'm not sure how to turn reactance to a voltage level using an op-amp?
thankz said:did I say resistive ladder I was think of a dac, prob successive approximation but I'm not looking at the data sheet.
thankz said:a capacitive probe being measured by a resistive ladder adc. 0-5 volt range, response time not important,
One could apply direct current and measure rate of voltage rise, or measure voltage after known charge has accumulated,thankz said:I'm not sure how to turn reactance to a voltage level using an op-amp?
I could interpret this as relating to varactor diode chopper opamps from 1950's, but i doubt it's what you meant.thankz said:example of a varible capacitor input op-amp to voltage level circuit.
A variable capacitor is an electronic component that can be adjusted to change the capacitance, or ability to store electric charge, in a circuit. It is commonly used in radio frequency circuits to tune the frequency of the circuit.
An op-amp, or operational amplifier, is a type of electronic amplifier that amplifies the difference between two input voltages. It is commonly used in analog circuits to perform mathematical operations such as addition, subtraction, and differentiation.
In an op-amp circuit with a variable capacitor input, the input voltage is fed into the non-inverting input of the op-amp, while the variable capacitor is connected to the inverting input. The op-amp then amplifies the voltage difference between the two inputs, producing an output voltage that is proportional to the capacitance of the variable capacitor.
The variable capacitor allows for precise tuning of the circuit's frequency, as the capacitance can be adjusted to match the desired frequency. This is useful in applications such as radio receivers, filters, and oscillators.
Yes, a variable capacitor input op-amp can also be used for other applications such as voltage control, filtering, and signal conditioning. It can also be used in conjunction with other components to create more complex circuits and perform more advanced functions.