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
- 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.
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
- +12VDC
- GND
J2 - Pot/Frequency Adjust
- GND
- Adjust
J3 - Output
- VCO Out
- GND
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