Part number: 4 Haos Redro Last update: 14/06/2009

Four input summing amplifier module

Resources:

7 Overall schematic FIG | PDF
8 PCB layout FIG | PDF (copper) | PDF (copper+component)

Description:

A four-input non-inverting summing amplifier module.

Table 1: Component function

R1-R5,IC1A These form an inverting summing amplifier. The output voltage is given by (V1/R1 + V2/R2 + V3/R3 + V4/R4)*R5. It is recommended that for each input the source impedance is 1/10 of the input resistance or less.
R6,R7,IC1B These form an inverting buffer to provide a noninverted output.
C1 This provides high frequency noise suppression.
C2,C3 Supply rail decoupling capacitors.

PCB layout:

The PCB is intended to be integrated into a larger design using right-angled pins so that it stands vertically from the motherboard much like an SIL packaged part. All three connectors are located along the lower edge of board.

Power:

The datasheet of the model of op-amp chosen for IC1 should be consulted for information regarding the power requirements of this module.

Images:


Completed module (two inputs used)
Copyright © 2008 Taiyo Rawle. This document is released under the terms of the TAPR Open Hardware License version 1.0 or at your option any later version as published by TAPR: http://www.tapr.org/ohl.html