Precision Adder. Euro Format.

Motivation

Buffered Multiple front view.

This is a useful and often needed utility module. The input voltages are precisely added to the outputs.The inputs 1, 3 and 5 are normalized. It can be used in different ways: As three independent adders, as buffered multiple, adding a modulation source simultaneously to all three outputs, adding two, three or four voltages precisely and a few more, depending on your patch. The accuracy depends on the used operational amplifier. For pitch CV I recommend precision OpAmps like the LT1014.



Specs and features


Implementation

Schematic

Precision Adder schematic main board

Precision Adder schematic: Main board

Precision Adder schematic control board

Precision Adder schematic: Control board 02

Description:

All inputs are buffered with high impedance inputs. They are followed by precision adders where the two inputs and the two additional modulation inputs are added together. The last stage buffers the output and corrects the phase. Inputs 1, 3 and 5 are normalized.


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Calibration

  • None
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Building hints

  • The accuracy depends on the used operational amplifier and the matching of the resistors. For pitch CV I recommend precision OpAmps like the LT1014. Match all 10k resistors to 0,1% or better.

Special parts

  • None

Download

Precision Adder main PCB documentation download
Precision Adder main PCB Gerber files download
Precision Adder control PCB documentation download
Precision Adder control PCB Gerber files download

Precision Adder front view

Precision Adder: Front view


Precision Adder main PCB

Precision Adder: Populated main PCB


Precision Adder side view

Precision Adder: Side view



2020 October V 0.9.0-EB

2020 October V 0.9.0-EF

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