Free Simple Circuit Diagram
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 won’t be able to catch a fast event. Here is the schematic diagram of the circuit: This circuit is used […]
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This is a linear FM detector circuit. This circuit usually is used in telemetry applications and wide range of analog communications. The main part of this circuit is a XR-2211. This circuit has an external buffer/amplifier that is needed due to the high-impedance output at pin 11 of XR-2211. This circuit also has a post-detection filter Rf/Cf. This circuit produce […]
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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 input voltage of this circuit is regulated to 1.2V by the LM113 diode. This voltage is used to set operating […]
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Using very popular multivibrator 555 IC, we can build an alarm circuit which is similar to old ambulance siren. There are two sections inside the circuit, first is a low frequency oscillator for two level frequency modulation, and the second is the higher frequency oscillator for sound generation. Here is the schematic diagram of the circuit: The upper part is […]
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