8x Output Buffer Add-on

Product status: Ended

manikk 8x Output Buffer is an add-on for the Otto Passive Mono.

NOTE! This is just the add-on, not a complete module. To create a complete module, you need to order an Otto Passive Mono also.

When you combine this add-on with the Otto Mono, you get a 2HP 8xBuffer module with 8 inputs on a pinstrip on the backside and 8 output jacks on the front panel.

The images below shows the final result when attached to the Otto Passive Mono.

The module can be useful if you have another module or signal source that have unbuffered output pins and you would like to buffer these signals, and route them to dedicated jacks on the front panel.

The signals are buffered by OP-amps without any signal processing.

NOTE! All 8 input-signals MUST be connected to something. This is because an OP should not be left floating on the input. Unused pins must therefore be connected to GND. You can for example connect to unused GND-pins on the Otto Passive Mono.

You can use female-to-female dupont cables (not included) for the input-connections on the back.

The eight outputs have a protecting 1k resistor before the output-jack.

The single row pinstrip for the 8 inputs are located at the top/back of the add-on. There is also a 9th pin for GND. You can connect this GND-pin to a GND-pin on the other source-module if needed.

The dual row pins on the bottom/back of the add-on is the regular eurorack power connector. The negative -12V is marked on the PCB. The power cable usually has a red stripe for the negative -12V. Make sure to get the orientation correct.

The Otto Front have normalizing pins for the 8 jacks, where each of the incoming input-signals is re-routed to these pins if no plug is inserted in the associated jack.

See also the FAQ for more tips and tricks.

Package Contents

  • 1 Add-on board
  • 1 Power cable
  • Comes in a plastic zip-bag
  • Plastic zip bag

See here how to attach stickers to the front.


250 SEK

Technical specifications


Width: 2 HP
Depth: 44 mm

Current consumption

+12V: 14,2 mA
-12V: 14,2 mA

Additional files, images and videos

Left view

Right view

Back view