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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Balance Indicator for Symmetric Power Supply

Balance indicator for power supply show if a symmetric¬† power supply is really symmetric or not. With two comparator pairs from a LM339N quad comparator we can make a such indicator. One pair drives the red warn LED3 and the … Continue reading

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Simple Ultrasonic Wave Generator

Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to 50 kHz. Its very easy and quick to make this circuit. This circuit uses NE555 IC … Continue reading

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General Infrared Remote Controlled Relay

This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high frequency modulated infrared light. By filtering out un-modulated or low frequency modulated signal, this circuit … Continue reading

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Heart Monitor (ECG Sensor Signal Amplifier/Conditioner)

Using the circuit depicted in the schematic diagram below we can monitor the heart pulses of patient. This circuit buffer and amplify the heart pulses, and the amplification bandwidth ranges from DC to 3 kHz. For the core of the … Continue reading

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