XR-2206

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XR-2206 Board

The XR-2206 board is based on the XR-2206, which is a single IC function generator. The board adds the external parts to make a sine wave generator capable of being controlled from the High Voltage Digital Pot or the High Voltage Digital Pot 2 board. This allows a microcontroller to digitally set the frequency of the output.

XR-2206 IC

The XR-2206 can generate a low distortion sine wave well above and below the audio frequency range. The Exar XR-2206 is no longer manufactured, but it is widely available on ebay from China.

Rev X3 Board

This is the third revision of the board.

Rev X3 Schematic

Xr2206-schematic-x3.PNG

Rev X3 Layout

Xr2206x3-front.png

Rev X3 Mounting Holes

The board has three 4-40 mounting holes for either mounting horizontally with standoffs or vertically with an L bracket.

Rev X3 improvements over X2 version

  • Replaced Waveform adjust fixed resistors with 25K variable resistor (RV1).
  • Split GVS header (J1) into GV and GS headers for separate power (J1) versus outputs (J3).
  • Added a 3rd mounting hole.

Connectors

The connectors are two pin 2.54mm (0.1") pitch headers.

J1 - Power

  1. +12VDC
  2. GND

J2 - Pot/Frequency Adjust

  1. GND
  2. Adjust

J3 - Output

  1. VCO Out
  2. GND

Rev X2 Board

File:XR-2206-2013-01-19-143626.jpg

Rev X2 Schematic

File:Xr2206-schem-x2.PNG

Rev X2 Connectors

J1 is Power/signal control circuit connected as GVS (Ground, Voltage (+12V), and signal output).

  1. Ground
  2. Voltage (+12V)
  3. Sine wave output

J2 is the connection to an external pot.

  1. Ground
  2. Resistance

Rev X2 Parts List

Rev X2 Mounting Holes

The board has a single 4-40 mounting hole for either mounting horizontally with standoffs or vertically with an L bracket.

Alternatives

Rev X1 Board

File:XR-2206-2013-01-04-182208-X1.jpg

Rev X1 Schematic

File:Xr2206-schem-x1.PNG

Rev X1 Board Issues

  • VGS silkscreen s/b GVS
  • Resistors are 1/8W leaving this point alone since it's small and I bought 1/8W resistors already
  • Dropped ground plane from .020 to .012"
  • Need pin 3 connections.
  • R1 s/b 10K
  • Changed C1, was 1uF, s/b 0.1uF
  • Pin 3 is missing waveform adjustment resistors