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 Push Pull Power Amplifier

This is a The Push Pull Power Amplifier circuit. This circuit is a class B push pull amplifier. When there is no signal input, the TR3 and TR2 are not conducting. If there is no signal input, this circuit draw … Continue reading

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Transistor Common Base Amplifier

As far as AC is concerned, the base is connected to the ground by the C3. Therefore, both input and output are connected to the base (common base amplifier). The magnitude of the current gain is less than 1 since … Continue reading

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Transistor Class A Power Amplifier

The transistor is biased in class A. That’s mean the collector current flows all the time. This current can increase or decrease,  caused by the input signal which increases and decreases the forward bias. This increasing or decreasing depends on … Continue reading

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Zener Diode Signal Limiter

Zener diode has been commonly used as  signal limiter. With a single diode and a resistor, the limiter will limit the half cycle of a signal to it’s forward bias and  and the other half cycle to its reverse breakdown … Continue reading

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