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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Darlington Transistor Pair Logic Probe

Ideally, any testing equipment will not draw any current from the device under test. This ideal condition can be approximated by  designing a testing device with a very high input impedance for negligible loading, and this Darlington logic probe circuit … Continue reading

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Logarithmic Light (Photodiode) Sensor Signal Conditioner

There are many measurement system that would be more suitable if we use logarithmic scale, especially when we try to mimics human sensory response. Most physical phenomenon that sensible to human’s biological sensor system is wide range in nature. Human … Continue reading

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RS232 Line To 5 V Level Converter

RS 232 line to 5 V converter circuit schematic diagram is shown on the following figure. The MAX680 is normally used as a charge pump voltage converter. This converter can convert +5 V to ±10V. The MAX 680 works in … Continue reading

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Optical Pyrometer Detect The Spectrum Composition

This pyrometer is used to measure an incandescent body. The principle for this measurement is that the hotter the body, the spectrum of the radiation will contain more shorter wavelength (visible light). This circuit use infrared filter to separate the … Continue reading

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