Emergency Stop Schematic Circuit Diagram

The big fear of every developer of a microcontroller or computer-driven control system is that the computer or controller could crash while it is in the middle of controlling something and that the output signal will remain on ‘full throttle’. In this scenario, motors could continue to spin faster and faster or a heating element[…]

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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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Simple IR Receiver Schematic Circuit Diagram

This circuit has been designed to complement the ‘Simple IR Transmitter’ and to decode its transmitted signals. The similarity to the transmitter can be clearly seen: the received data is decoded by a shift register (74HC4094), which again is clocked by a counter/oscillator (74HC4060). The receiver is started by the first edge from the IR-receiver[…]

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