Motivation

Out Module front view

This is my replacement of the original Elektor Formant COM module. I discarded the original circuitry because of the TL085 used with his unusual pinout and the availability of dedicated audio operational amplifiers. I used a more effective filter implementation for tone control. The tone control is derived from "Small Signal Audio Design" by Douglas Self Chapter 15. A optional level indicator makes it easier to find the right volume level for best SNR. The maximum output volume is adjustable to protect your PA. You can connect the output directly to active monitors.



Specs and features


Implementation

Schematic

Out flat back PCB schematic

Out flat back PCB schematic


Description:

A description can be found in "Small Signal Audio Design" by Douglas Self Chapter 15


Out flat front PCB schematic

Out flat front PCB schematic


Description:

A description can be found in "Small Signal Audio Design" by Douglas Self Chapter 15. A optional volume indicator is added.


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Calibration

Adjust the maximum output level to your needs with TR1

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Special parts

None

Download

Out front PCB documentation download

Out back PCB documentation download


Output module: back view

Output module: back view


Output module: back view

Output module: side view


Output module: front view

Output module: front view


Output module: side view

Output module: side view


2018 July

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