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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Supply Voltage Monitor with 555 IC

This is a supply voltage monitor circuit, an indicator to show if the power supply is in good condition. Designed using the IC 555 timer, this circuit will flash the LED1 when the supply voltage surpass preset level.  With flashing … Continue reading

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Power FET Lamp Flasher

As an alternative to bipolar transistor, a lamp flasher can be built by using two power FETs.  Like other flasher circuit, this circuit alternately switch the two lamps off and on.  It is based on a simple astable multivibrator that … Continue reading

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Low-Capacitance High-Impedance Video Buffer

A video buffer circuit is characterized by its stable wide-band unity gain. Along with stable wide-band unity gain,  providing low capacitance and high input impedance will be enhance the circuit’s performance, and  the circuit depicted in the following schematic diagram … Continue reading

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One-Shot Multivibrator

A one shot multivibrator generate a fixed width pulse at the output when the input is triggered. This fixed width output should be consistent, regardless the width of the input trigger. One example of one shot multivibrator circuit is shown … Continue reading

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