Pulse generator

This pulse generator can provide up to 12 pulses at its output depending on the setting of hexadecimal switches S2 – S3. The (rectangular) pulses are generated by IC3c with circuit values as shown their p.r.r (pulse repetition rate) is a few KHz. The output of generator is taken to one input of NOR gate[…]

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Thermocouple-to-DMM interface

Thermocouples are economical and rugged devices for temperature measurements. Because of their small size, they respond quickly and are good choices where fast response to temperature changes is important. Type K thermocouples have a wide temperature range. “and are used from cryogenics to jet engine exhaust analysis. The present circuit converts thermocouple outputs into a direct[…]

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Relative humidity sensor

The Type NH-02 humidity sensor from Figaro consists of a capacitive humidity sensor, Zs. in series with a thermistor.Z, on an aluminum substrate. The parameters of the thermistor ensure that it compensates the temperature-dependence of the dielectric of the sensor almost completely. Over the temperature range 15-35 °C. the temperature dependence of the NH-02 is[…]

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Frequency probe

The frequency probe enables ”listening in’ to the speed of a computer. It is, however, also suitable for use with other digital circuits because it makes high frequency audible so that signal can be conveniently monitored. A 12-bit counter serves as a frequency detector. The signal measured in a computer or digital circuit is divided by 1024[…]

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