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XR 2206 X1

Page history last edited by MrTundraMan 11 years, 1 month ago

XR-2206 Function Generator

 

 

Description of the Design

 

The XR-2206 is a function generator. It 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.

 

The board adds the external parts to make a sine wave generator capable of being controlled from the High Voltage Digital Pot board. This allows a microcontroller to digitally set the frequency of the output.

 

Connectors

 

  • J1 is Power/signal control circuit connected as GVS (Ground, Voltage (+12V), and signal output).
    • Pin 1 = Ground
    • Pin 2 = Voltage (+12V)
    • Pin 3 = Sine wave output
  • J2 is the connection to an external pot.
    • Pin 1 = Ground
    • Pin 2 = Resistance

 

Parts List

 

Mounting Holes

 

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

 

V1 Issues

 

  1. VGS silkscreen s/b GVS
  2. Resistors are 1/8W (leaving this point alone since it's small and I bought 1/8W resistors already.
  3. Dropped ground plane from .020 to .012")
  4. Need pin 3 connections.

 

Alternatives

 

Revision X3 Changes

 

 

  • 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).

 

Connectors

 

J1 - Power

 

  1. +12VDC
  2. GND

 

J2 - Pot/Frequency Adjust

 

  1. GND
  2. Adjust

 

J3 - Output

 

  1. VCO Out
  2. GND

 

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