Author Archives: Rend

General Infrared Remote Controlled Relay

Posted on January 24, 2012 by Rend

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)

Posted on December 20, 2011 by Rend

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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LM139 One-Shot Multivibrator

Posted on December 9, 2011 by Rend

The circuit below is a one-shot multivibrator. One shot multivibrator is also known as monostable multivibrator, or timer. The main function of such circuit is producing a fixed width pulse. The width of this pulse is determined by the component … Continue reading →

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