OPA462 High-Voltage (180-V), High-Current (30-mA) Operational Amplifier
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http://datasheetlab.com –
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LED VU Meter Circuit
http://circuitdigest.com –
We have built a Volume Meter or VU meter, with the help of MIC, OP-AMP and LM3914, which glows the LEDs as per strength of the sound, if sound is low, lesser LEDs will glow, and if sound is High more LEDs will glow, check the Video at the end. VU meter also serves as a volume measurement device.
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Op-amp Circuits
http://www.facstaff.bucknell.edu –
The integrator does just what the name implies. It integrates - in the calculus sense - the input signal to produce the output signal. There is a scaling factor and a minus sign again, but that's pretty much what happens.
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Transistor Schmitt Trigger
http://www.daycounter.com –
The Schmitt-trigger is a circuit which creates hystereses and which is useful in digitizing an analog signal into a digital signal of either high or low. The hystereses makes inputs more immune to noise. The input must surpass a low threshold voltage before the output goes low, and likewise the input must exceed a high level threshold before the output goes high.
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Dark and Light Detector Circuit
http://circuitdigest.com –
In this project, we are going to make a day and night indicator (or dark and light indicator) which will indicate if there is a dark or light in the surroundings. Some applications of this circuit, are street light controlling, home/office light controlling, day and night indicators, etc.
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