General Infrared Remote Controlled Relay

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 will be able to remove any interference from ambient infrared light coming from other sources such as sun light, soldering  […]

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Heart Monitor (ECG Sensor Signal Amplifier/Conditioner)

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 isolation, a Burr-Brown BB3656 isolation amplifier integrated circuit (IC) is used in this circuit. With internal transformer inside, this integrated […]

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