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[…]

Read more

SW Converter for Digital AM Car Radio Schematic Circuit Diagram

This circuit is purposely presented with many loose ends (not literally, of course) to stimulate experimenting with RF circuitry at a small outlay. Looking at the circuit diagram you may recognize a modified version of the SW Converter for AM Radios described elsewhere in this issue. The modifications were necessary to make the circuit compatible[…]

Read more
1 2 3 4 5 53