Free Simple Circuit Diagram
When there is quiet passages, a tape noise becomes disturb. This noise can be reduces using Philips’ Dynamic Noise Limiter circuit. The principle operation of this circuit is improve the signal-to-noise ratio during the quite periods by decreasing the gain for the higher frequencies. However, on the higher frequency components of the signal, the effect is not significant because the […]
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A window comparator formed by two op-amps packaged into IC1 is the heart of the circuit below. With this technique, we can detect precisely and symmetrically either the positive or negative peak value reached by the monitored signal. The op-amps outputs are smoothed by C4, R7, and R8, mixed by D1 and D2, and feed the LED driver Q1 with […]
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When the volume control is turned down, sometimes it causes the sound to be “dulled”. The series resistance of the pot interacting with the capacitance of the next stage to form a low pass filter and a resulting high frequency loss causing the dull volume control. To prevent this, a small capacitor can be added from the input to the […]
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This is a simple Low-Pass and High-Pass RC Filter Frequency Calculator. This calculator is used to calculate the corner frequency of low pass and high pass filter. To change from low pass to high pass, just switch the position of the resistor and capacitor. The corner frequency does not change because the calculator assumes a low source impedance. Here is […]
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