4-channel mixer/attenuator with 2.0x gain and 5V offset

Ampmix was designed as a handy CV mixer and processor with buffered inputs but its low-noise circuit means it will also work great with audio, even with full gain.

A 2.5V voltage offset is generated then normaled to the inputs of the 4 channels, giving them a maximum of 5V out each with knobs turned full clockwise (2.0x gain). Please note that these offsets will affect the mixing if the channel hasn't been patched on its input or output, so turning all unused channels fully counter-clockwise/left (off) is advisable for a clean mix.

It works as 4 channel mixer,
1 attenuator + 3 channel mixer,
2 attenuators + 2 channel mixer
or 4 attenuators.
With up to 2.0x gain on each channel.

The buffered inputs offer very large resistorless jFET impedance and is unaffected by output impedance (isolation/protection resistors) on the modules going in to the mixer. If a patch cable is inserted but loose at the other end, the input will be floating (this is modifiable by a resistor between input pin and ground on the inputs jacks, input impedance will then be equal to this resistors value).
The outputs have 1kohm impedance.

http://shop.ljunggrenaudio.com/en/items/ampmix.ryo

• ? mA +12V
• ? mA -12V
• ? mA 5V
• 31 mm Depth

No info about availability.