PIC RJ-45 Cable Tester Schematic Circuit Diagram

This RJ-45 cable tester automatically checks cable continuity and tests the connection configuration. Each of the eight connections is checked independently and short-circuits are detected.   The circuit can be built using either a PIC16C62B or a PIC16F72. This microcontroller was chosen, as it has 22 input/output pins. Each RJ-45 socket uses eight input/output pins,[…]

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Remote-controlled Preamp with Digital Pot Schematic Circuit Diagram

This circuit is a simple but high-quality preamplifier using a DS1882 digital potentiometer, a device specially designed for audio applications. The potentiometer is controlled over an I2C interface by an R8C/13 microcontroller. The main features of the design are its remote control and lack of moving parts.   The circuit is controlled by two buttons (volume[…]

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