Author Archives: Rend

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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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Car Headlights On Reminder

More important than environmental issue of energy saving, avoiding car battery failure when you leave the headlamp turned on overnight in the garage is possibly more important for your concern. This is a circuit of automobile lights-on reminder if you … Continue reading

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20Hz High-Pass Rumble Filter, Subsonic Blocker

This is a schematic diagram of 20-Hz high-pass rumble filter circuit.¬† Rumble noise could come from many sources, such as wind blow around an outdoor microphone, mechanical disturbance on phonograph, or many other possibilities. We can remove this noise by … Continue reading

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Crystal Oscillator with CMOS Inverter

This is an astable multivibrator¬† (oscillator) circuit using CMOS inverter. This circuit uses CD4007 or MC14007. This circuit has operating frequency range of 10kHz to 10MHz.¬† The frequency is not determined only by the crystal, but fine tuned further by … Continue reading

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Fast Sample-And-Hold

Sample and hold circuit is used to pick a signal and hold the level at its output, making it useful for analog digital conversion or other application where the processing need a constant level signal for the input. The circuit … Continue reading

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