Author Archives: Rust

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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Digital pH Meter Signal Conditioner

Posted on November 21, 2011 by Rust

A pH meter circuit is basically an amplifier to boost a voltage signal which is produced by a pH probe. The pH probe itself is equal to a battery cell when submersed in the measured solution, producing a weak voltage … Continue reading →

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