Sumtiple

Sumtiple

precision adder and active multiple

 

Description | Specifications | Order online

Description

A 3-input precision adder is combined with a 3-output active precision multiple. The multiple input is normalized to the adder output, so you can have 4 adder outputs total.

Very low gain and offset error make this a perfect tool for adding and splitting pitch CVs, but it is also a great general purpose tool. Of course works for audio as well.

A RGB-LED shows the adder output signal (red positive, blue negative) and multiple input (green, positive only)

You can multiply an input by 2 or 3, by patching the multiple outputs to the adder inputs.

Sumtiple is available as a completely assembled and calibrated module, or as DIY kit. The kit has assembled SMD parts and contains all THT parts and front panel. Construction manual as PDF here.

Technical specs

Adder:

  • Maximum offset 0.2mV, 0.24 cent
  • Gain error of maximum 0.1mV @10V input = 0.001%
  • Input impedance: 47k
  • Output impedance: <1 Ohm

Multiple:

  • Maxiumum offset: 0.1mV, 0.12 cent
  • Gain error of maximum 0.1mV @10V input = 0.001%
  • Input impedance: 1 Meg
  • output impedance: <1 Ohm

The design uses very low offset opamps and 0.05% resistors to accomplish these specs. In addition to this, the gain of the adder stage is calibrated on each unit.

  • Printed aluminium front panel, 2mm thickness
  • Supply voltage: +-12V and/or +-15V
  • Supply current: +12V: 10mA , -12V: 10mA, 5V: 0mA
  • Dimensions: 3HE, 2HP, 128.5mm x 10mm, Depth: < 35mm (including power connector)
  • Input / output voltage range -10..10V (20 octaves)
  • Weight: 30g

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