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High Voltage Digital Pot


Description of the Design

Purpose is to have digital control over an analog potentiometer. Most analog pots have limits on the voltage that can be on the pot terminals - they can only be between ground and +5V. This design is different since it can be run up to 30V single ended or +- 15V with a split supply. This board is designed to be run at 12V on the high voltage side.



J1 - Controls/Power input connector

  • Pin 1 = VDD - Connects to Analog +V (Using +12V)
  • Pin 2 = Vss - Connects to Analog -V (Using as analog ground)
  • Pin 3 = Shutdown pullup to +5V
  • Pin 4 = SD1 In Serial Data in for Pot 1
  • Pin 5 = SD2 In Serial Data in for Pot 2
  • Pin 6 = CLK - Data Clock
  • Pin 7 = Chip Select
  • Pin 8 = GND 

Two "pot" outputs on 0.1" centers can be connected easily to the Audio Amp 386 board or Audio Amp 384 board to act as the volume control and to the XR-2206 board to perform frequency control.

Mounting Holes

This board can be mounted vertically long two axis using two of the three 4-40 mounting holes. Or it can be mounted horizontally using three screws.

V1 - Issues

  1. Header pins are too small holes. Used SIP-x header instead of PIN_ARRAY_xX1 footprint.