MCP4725 DAC

VIN to board 5V
GND to board GND
SCL to board SCL with 2K resistor
SDA to board SDA with 2K resistor
VOUT to left mono jack tip

QT Py RP2040

GND to left mono jack sleeve
GND to right mono jack sleeve
A1 to right mono jack tip

The 2K resistors for SCL and SDA keep the incoming logic level at 3.3V, rather than 5V.

Why Not Use a STEMMA QT Cable?

The DAC is using the QT Py RP2040's 5V output for power so that the 1V/oct signals have a range of 0 to 5V. If you do not need a range of 5V, then you can use a STEMMA QT cable to power the DAC with 3.3V and make the GND and I2C connections.

This guide was first published on Aug 02, 2022. It was last updated on Nov 29, 2023.

This page (Circuit Diagram) was last updated on Jul 29, 2022.

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