Description

An attenuverter is a utility that allows the user to scale and invert a signal. With the control at 12 o’clock, the signal is attenuated down to zero. Turning the control clockwise functions like a normal attenuator, while turning counter-clockwise the signal is inverted and attenuated.

This module has 4 attenuverters in a 6HP module. The attenuverters use curve shaping to have a log-like response for both positive and negative signals, which allows for greater sensitivity near the center of the control. All outputs are connected to a mixer via their normal connection and connecting a jack into an Out socket removes that channel from the summed mixer output. The mixer also has an extra unity gain input for adding an external signal or bussing together multiple modules.

This module also has a 5V reference voltage which is normalled to the input of the first attenuverter. This provides an easy source for static voltage offsets. The 5V reference can be optionally normalled to the other jack inputs by connecting solder bridges on the PCB.

This PCB uses surface mount technology, with 0805 passives and SOIC opamps.

Attenuverter – Build documentation | Kassutronics Blog