Author Archives: Rust

Speech-Pass Filter

Posted on March 15, 2012 by Rust

A speech-pass filter circuitry is shown in the the schematic diagram below. This speech circuit is useful in an application when the frequency spectrum of the signal should be limited to contain only speech (human voice) information. Voice recording or … Continue reading →

Posted in Audio and Music, Signal Processing | Tagged , | Comments Off

Digital pH Meter Signal Conditioner with Pulse/Frequency Output

Posted on March 1, 2012 by Rust

A signal conditioner for pH meter probe is required to have high input impedance. The signal conditioning of the pH meter probe is done by providing a buffer with gain, offset, and volatge to frequency converter. High input impedance requirement … Continue reading →

Posted in Test and Measurement | Tagged , | Comments Off

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 →

Posted in Lighting and LED Circuit, Test and Measurement | Tagged , , | Comments Off
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