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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Transistor Emitter-Follower Buffer

For a voltage source, an emitter follower can serve as a buffer. The voltage divider on the left is so strongly affected by the value of the load resistor make it a poor voltage source. The same voltage divider on … Continue reading

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NPN Transistor Common Collector Amplifier

This is circuit of NPN Common Collector Amplifier. This circuit can be used for impedance matching. This circuit similar to the Emitter Follower circuit because the emitter of this circuit is follows the base minus a diode drop. This circuit … Continue reading

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JFET Low Noise Preamp

Noise, in amplifier circuit, is generated intrinsically by each components inside the circuit. Resistor, capacitor, and semiconductor generate noises. By simplifying the design of a circuit, we can minimize the noise especially if we can push the number of components … Continue reading

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Single Chip Two-Tones Siren

Kids like the police or fire-brigade cars siren sound. This circuit can generate dual tone like Police or Fire-brigade cars siren sound. This circuit usually installed on battery powered cars, bicycles, and motorcycles. Not only that, but also can be … Continue reading

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