Category Archives: Test and Measurement

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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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Peak (Pulse) Voltmeter

This is a Peak Voltmeter circuit. This circuit can be viewed as a pulse stretcher, which catch fast pulse signal to be measured by a slow response voltmeter. Even a fast response meter need this circuit since our visual perception … Continue reading

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2N222 Transistor As Temperature Sensor

This is a simple Electronic thermometer circuit. This is a inexpensive circuit because probe or sensor that is used in this circuit is 2N2222 silicon transistor. The accuracy of this circuit is better than 1°C over a 100°C range. The … Continue reading

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Digital 7 Segment Pulse Counter

A pulse counter can be built by using 7490 decode counter and 7557A. This circuit can count from zero to 9. Pins 3 and 2 of all 7490’s must be connected together. Here is the schematic diagram of the circuit: … Continue reading

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Very Simple Light Meter

Very simple light meter can be constructed using LDR (light dependent resistor)  wired in series with a battery, variable resistor, and  ampere meter. Here is the schematic diagram of the circuit: The ampere meter is a 100 uA analog meter. … Continue reading

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