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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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Triangle Waveform Signal Generator

A symmetrical, 10 mV peak to peak triangle waveform can be generated by the circuit depicted in the following schematic diagram. This circuit is featured with alternative DC biased output which can be used to feed an ADC.  The DC … Continue reading

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Isolated Remote Temperature To Frequency Converter

The following circuit shown in the schematic diagram converts temperature reading (from +30° to +30° F) to its corresponding frequency (30 to 3000 Hz). Other benefit is that a 4N28 isolate the output to protect the receiver from dangerous interference. … Continue reading

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Voltage Controlled Gain Video Amplifier

Gain adjustment will be more flexible if it controlled by a voltage signal, since we can use many methods to provide user interface. We can control it by a potentiometer with anti glitch filter, or we can drive it with … Continue reading

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Audio Powered Tape Recorder Switching Controller

When the source of the sound is only intermittently exist, it’s better to turn on the tape recording only when it really present.  We can control a tape recorder to switch a tape recorder on when audio is present by … Continue reading

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