Assembly instructions for v1.0.x boards

These instructions are for the assembling the Ultimate Voice Changer Arduino Shield versions 1.0.0 and 1.0.1. If you don’t already have one of these kits then you can purchase one from my Tindie store.

First, here is a rendering of the board layout, which is easier to read then the board itself if your eyesight is anything like mine.


The kit should include the following components in addition to the board:

  • MCP3208 IC
  • MCP4921 IC
  • Audio jack
  • 330 ohm Resistor
  • 1K Resistor
  • 1.5K Resistor
  • 0.1uF Capacitor
  • 10uF Electrolytic capacitor
  • LED
  • Breakaway headers

Here is a photo of an assembled board that you can use as a guide when assembling yours.


The board is pretty simple to assemble but there are some things to watch out for:

  1. The MCP4921 and MCP3208 must be placed in the correct orientation! The board has a square solder pad for pin 1 and is also marked with a ‘*’ symbol. Use the above photo as a guide when placing these components.
  2. The electrolytic capacitor (the large blue one) must be inserted with the correct polarity. The longer lead must be soldered to the square pad.
  3. The LED must also be inserted with the correct polarity. The board shows one flat side to the LED and this should match the flat side on the LED itself.
  4. If you have the v1.0.0 board, there is a small “via” (small hole connecting a trace on the top and bottom of the board) very close to the pads for digital pins 8 and 9. Be extra careful not to connect those pins to the via.
  5. You will need to check the resistors with a multi meter to make sure the correct value resistors are being used in each location. Alternatively you can read the color codes on the resistor to determine the value but I highly recommend buying a basic multimeter if you don’t already have one.

If you have any questions at all please post a comment here, connect with me on Google+, or contact me via my Tindie store.

I recommend using breakaway headers on the A1 through A8 ADC breakout pads. There is no need to put headers on all of them unless you really think you need them all.

Connecting the Mic

If you have the Sparkfun Mic:

  • Mic VCC to A1 VCC
  • Mic GND to A1 GND
  • Mic AUD to A1 IN

If you have the Adafruit Mic:

  • Mic VCC to A1 VCC
  • Mic GND to A1 GND
  • Mic OUT to A1 IN

Once assembled, you need to connect the mic to A1
Once you have the board assembled, simply download and install this Arduino library and upload one of the example sketches to the Arduino.

You will need to connect the mic to A1 and a potentiometer to A2 for the sketches to work correctly.

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2 thoughts on “Assembly instructions for v1.0.x boards

  1. Albert Allen

    Dear Andy and good afternoon from England
    Can’t download this sketch as above .shied built no problem need help to get it to work, the PC board is of great quality and the silk screen makes it easy to assemble. Totally new to this type of project and need help eg frequency pot connections pot resistance and mic input and oudio output connection details thank you in advance .Any programming help would also be appreaciated

    1. andygrove Post author

      Hi Albert,

      Sorry for the late response. I just saw your comment. I will send you an email directly and try and help you out with this!




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