Archive for the ‘Signal Processing’ Category
The circuit diagram below shows a circuit of graphic equalizer 6 band of regulation. The potentiometer RV1-6 regulates each band, and the sliding type is the recommended for better visual indication. . The gain is null (flat) in the center position of potentiometer, but in the maximum and minimum position has +/- 15 dB, boost …
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Below is a classic circuit of regulation of tone of three way. With this circuit, we can regulate low, mid and high frequencies of acoustic signal. We can regulate the boost/cut in the range of +- 18 dB/oct.
The supply on the the circuit is 15V, but it can be supplied with 9 until 30V. It’s …
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The heart of an average reading, rms calibrated AC voltmeter is shown in figure below. It’s a rectifier and averaging filter. We can remove the averaging function and provide a precision full-wave rectifier by deleting C2 and provide an absolute value generator by deleting C1.
By following the signal path for negative and then for positive …
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Digitizing transducer interface output voltage is shown on circuit diagram below. The transducer in this case is the NE5521, an LVDT (Linear Variable Differential Transformer) Signal Conditioner. To ensure that the input to the A/D does not go excessively beyond the supply voltage of the A/D, this device is use the diode at the A/D …
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This photodiode signal conditioning circuit is sensitive to light signal, suitable for interfacing digital serial signal. The biasing of the LM111 noninverting input is matched to the diode’s dark output, so it should be very sensitive.
[Source: National Semiconductor Application Note]
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Squarer circuit is used to shape signal, to get more defined square wave. This circuit is useful to make convert the signal so it has very fast rise time. Here is the schematic diagram of the circuit:
[Source: National Semiconductor Application Note]
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