Confetti704 Non Inverting Summer

The non inverting summer board for the Analog Computer Confetti. A good description of the basic functionality of the summer one can find here: The Summing Amplifier.
The board has a jumper marked as V3 for using the sum of two (no jumper) or three inputs (set jumper) different inputs..

The screenshot of an oscilloscope: summing to different inputs together, a square wave plus a sine wave.

Paper PCB


  • Resistors:
  • 1x 33.33 kOhm
  • 4x 100 kOhm
  • Semiconductors
  • 1x TL074 OpAmp
  • Mechanical:
  • 1x IC socket, 14pins
  • 1x 2 pin strip
  • 1x jumpers
  • 4x 2 pin header, female
  • 2x pin header, female 90° 1×3, 1×2
  • 2x pin header, male 90° 1×3, 1×2


The Confetti704 Non Inverting Summer was designed by Wolfgang Spahn 2015-19.
It is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Creative Commons License