Category Archives: Audio and Music

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MAX1703 Single-Cell Boost Converter Circuit

When you design a circuit with only a single-cell battery, you will need boost-converter to provide enough voltage for most ...

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55MHz Scope Sensitivity Amplifier

Scope sensitivity amplifier is a vital front-end signal processing for every scope instruments. The function of this circuitry is simple: ...

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Two-Band Bxandall Active Tone Control

Using active circuit for tone control means that we can provide cut and boost, maintaining overall amplifying factor of original ...

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Pulse Width (PWM) Controller Circuit

A LM3900 quad operational amplifier can be used to build a pulse width (PWM) controller. The LM3900 was chosen because ...

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Small TV Modulator Using A Motorola MC1374

How can television modulator be small and simple like this? First, it uses integrated circuit, and the second, any TV ...

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Philip’s Dynamic Noise Limiter

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 … Continue reading

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Audio Signal Clipping Indicator

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 … Continue reading

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Prevent Treble Dull in Volume Control

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 … Continue reading

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Low-Pass and High-Pass RC Filter Frequency Calculator

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 … Continue reading

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