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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Simple IR Remote Tester

Posted on January 11, 2012 by Rust

The most common problem for infra-red (IR) remote control is the failure to transmit the pulsed infra-red light. The circuit shown in the schematic diagram below is an IR remote control handset tester. This device is very useful and easy … Continue reading →

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Frequency Modulated Oscillator (for FM Transmitter)

Posted on January 2, 2012 by Rust

An oscillator can be built using LC (inductor-capacitor) tank circuit. When we vary the capacity of the capacitor in LC tank circuit then the frequency of the oscillator will vary according to capacitance change.  The idea of this modulator is … Continue reading →

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