XR2206 Function Generator Kit Improved Instructions

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UPDATED ON:     17 May 2022

Introduction

The XR2206 Function Generator Kit is available through various outlets at a selection of prices up to £13. I got one branded ARCELI via Amazon for £7.99.

Having got one, I would advise getting the cheapest one you can. Just take into consideration the trustworthiness of the seller to be sure you get what you’ve ordered, paid reasonable post and packing charges and that you will actually receive it. Having looked at pictures of the finished article I suspect all brands circuits are the same but each brand may source their components differently.

Now you can see my other post “A Function Generator Built From A Kit Using An XR2206” to see how I got on with building these kits.

Quality of The Kit Parts

The Electronic Components And Circuit Board

I found the quality of all the parts to be good. All components were like all those used in modern electronic equipment. The resistors all had the same power handling capacity ¼W. This was reasonable for a low power device such as this XR2206 Function Generator Kit.

Similarly the electrolytic capacitor voltage ratings of 25v was ample.

The preparation of the circuit board was excellent too. Feed-through holes, tinning and lacquering all looked good to me. Solder flowed well around the holes.

The Transparent Acrylic Case

All components are attached to the circuit board and the whole is expected to be housed in a Transparent Acrylic Case. This case has six faces all cut out from transparent acrylic sheet 2.5mm thick. The six faces consist of four sides a top (Front Panel) and a Base. The Front Panel is engraved with labels for the controls.

The case is held together around the circuit board by tabs on the edges of the four sides which fit into slots on the Front Panel and base. The case parts are nicely presented and look as if they were cut out and engraved with a LASER.

Quality of The Instructions

This is the area that is lacking. The instructions are obviously translated from another language into English. They immediately stand out due to the regular reference to “welding” instead of “soldering”. My main reason for writing about this kit is to make the instructions clearer. Here are the original instructions on two sides of an A5 sheet.

XR2206 Function Generator Kit Instructions Page 1
XR2206 Function Generator Kit Instructions Page 1
XR2206 Function Generator Kit Instructions Page 2
XR2206 Function Generator Kit Instructions Page 2

How To Download An XR2206 Data Sheet

The data sheet for the XR2206 is available in HTML or PDF format from ALLDATASHEET.COM. Choose your format from the links in the list below:

The XR2206 Function Generator Kit New Improved Instructions

1. XR2206 Function Generator Component Layout Diagram

The original component layout diagram is satisfactory and is almost identical to the image printed on top of the circuit board. So I have photographed the circuit board to display here instead.

XR2206 Function Generator circuit board showing how the components are laid out
A picture of the front of the XR2206 Function Generator circuit board showing how the components are laid out.

2. The Function Generator Component Table

Below I have produced my own table listing the components with their description and value. For non electrolytic capacitors I have also listed the code printed on them.

COMPONENTDESCRIPTIONCODEVALUENOTES
R1Wire ended resistorBrown, Black, Black, Brown1kΩUnpolarised
R2 (VR1)PotentiometerB50350kΩUnpolarised
R3Wire ended resistorGreen, Brown, Black, Brown5.1kΩUnpolarised
R4Wire ended resistorOrange, Orange, Black, Black330ΩUnpolarised
R5Wire ended resistorGreen, Brown, Black, Brown5.1kΩUnpolarised
R6Wire ended resistorGreen, Brown, Black, Brown5.1kΩUnpolarised
R7 (VR2)PotentiometerB50350kΩUnpolarised
R8 (VR3)PotentiometerB104100kΩUnpolarised
C1Electrolytic capacitorNO CODE100μFPolarised
Long wire is +ve
C2Ceramic capacitor1040.1μFUnpolarised
C3Electrolytic capacitorNO CODE10μFPolarised
Long wire is +ve
C4Electrolytic capacitorNO CODE10μFPolarised
Long wire is +ve
C5Ceramic capacitor1051μFUnpolarised
C6Ceramic capacitor47347000pFUnpolarised
C7Ceramic capacitor2222200pFUnpolarised
C8Ceramic capacitor101100pFUnpolarised
U1Integrated CircuitXR2206CPNotch is between P1 & P16
JK1Power SocketNO CODE5.5mm Outside × 2.1mm Inside
J1-J2Header Pins & CapXM2.542×2pinFor Changing Waveform
J3-J7Header Pins & CapXM2.545×2pinFor Changing Frequency Range
P1Output Connectors3×1term.Screw Terminal

3. Soldering Instructions

The soldered side of the XR2206 Function Generator Circuit Board after soldering.
The soldered side of the XR2206 Function Generator Circuit Board after soldering.
  1. The components are fed from the front of the circuit board (the side with the writing on.) Start with the smaller less sensitive components listed here. After pushing them through their holes splay out their wires to hold them in place while the board is turned over and soldered:
    1. Resistors (bend their wires at right angles near to their bodies),
    2. Ceramic Capacitors,
    3. Electrolytic Capacitors.
  2. Solder:
    1. The IC Socket (align the notch in one end with the picture on the circuit board,
    2. Blue Terminal Block (ensure the connection holes face the edge of the board,
    3. Power Socket,
    4. Potentiometers.
  3. After soldering, at any stage, cut the unnecessary wires off as close to the board as possible. Any bits that protrude will make the total height of the board and components so big that the lid (front panel) won’t fit. I discovered this the hard way. The tabs on the potentiometers and the power socket must be bent to lie flat. I have acquired small wire cutters which sit very flat against the board and have a spring to open them especially for this work. You can see them below:
Newsome Small Springy Wire Cutters (11cm long).
Newsome Small Springy Wire Cutters (11cm long).

4. Debugging Stage

  1. After completion of soldering insert the IC (XR2206) into its socket. Observe its polarity by looking for the notch in one end and align that with the notch in its socket. Also try and take anti-static precautions while doing this. The pins 1 to 8 may need to be straightened and pushed towards pins 9 to 16 to reduce the distance between them. There are plastic tools available to assist with this.
  2. Connect a 9v to 12v power supply (or battery) to the power socket JK1. NOTE: The centre pin is the +ve connection and the outer barrel is the -ve connection.

5. Using The XR2206 Function Generator

  1. With the Jumper Cap (link) in the J1 position the XR2206 Function Generator will produce a Sinewave output at the blue terminal of P1 labelled SIN/TRI.
  2. With the Jumper Cap (link) removed from J1 position the XR2206 Function Generator will produce a Triangular wave output at the blue terminal labelled SIN/TRI. When choosing this setting the Jumper Cap (link) can be placed in the J2 position to retain it so it doesn’t get lost. The pins at the J2 position are not connected to any part of the circuit.
  3. A Square Wave output is always available at the blue terminal labelled SQU. The mark to space ratio is not adjustable using this kit as provided.
  4. The AMP control adjusts the amplitude of the Sine, Triangle or Square wave outputs. NOTE: This control is wired so that a clockwise movement DECREASES the amplitude and conversely an ANTICLOCKWISE movement INCREASES the amplitude. When turned to maximum the sinewave output is very distorted. This can be checked with an oscilloscope.
  5. The FINE control adjusts the frequency generated by small increments.
  6. The COURSE control adjusts the frequency generated by large increments.
  7. The Jumper Cap (link) J3 can be placed on the 2⨯5pin block in any of the five positions to change the frequency range covered by the COURSE and fine controls. The frequency ranges available are marked on the transparent cover and are:
    1. 1Hz – 10Hz,
    2. 10Hz – 100Hz,
    3. 100Hz – 3kHz,
    4. 3kHz – 65kHz,
    5. 65kHz – 1MHz.

6. The XR2206 Function Generator Kit Schematic Diagram

My Version of The XR2206 Function Generator Kit Schematic Diagram
My Version of The XR2206 Function Generator Kit Schematic Diagram

NOTE: The two Jumper Caps (links) in my diagram are plugged onto the pins of header blocks J1-J2 or J3-J7. In each case the link is shown by a dotted line between two pins. Running along the middle of each header block is an arrow. The tail of the arrow is at the lowest Jumper Cap position and the point is at the highest Jumper Cap position. The original instructions only refer to J1, J2 & J3. My instructions continue this numbering to J7 to describe the five positions their J3 can be placed in.

If the kit was more sophisticated it would replace J1-J2 with a single pole two way switch and J3-J7 with a single pole five way switch.


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