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HiFi Passive Preamp

https://www.electronics-lab.com/hifi-passive-preamp/

FutureSharks @ github.com has build a very nice HiFi passive preamplifier controlled by an Arduino board. It has the following features: Volume control and input selection via encoder and Apple remote. Uses a 256 step R2R relayed based attenuator. Completely passive. Only 5V power required. Adafruit NeoPixel shows volume level with colour. Sleep mode with low […]

IO expander board

https://www.electronics-lab.com/io-expander-board/

I/O Expander Board offers a convenient way to interface upto 16 I/O pins in your project using SPI/I2C bus. This kit uses the famous MCP23S17 IO chip from Microhip. Specifications Supply sourced through the interfacing Box Header connector The kit has 2 separate Box Header type connector for the 16 pins of I/O port and […]