An active multiple module like the Video Mult may be one of the simplest module in your rack, but don’t let that fool you into underestimating how much you’ll use it.
When you have one source signal (like an LFO, a video luma (brightness) signal, or a pattern mix or other control voltage) and you want to connect it in to several other modules then you have a few different options. If you use a splitter cable or a passive multiple module then you can sometimes find the signal levels from the source are “loaded down” and affected by the other modules it’s connected to, since all of those connected modules directly share the same source. Hook up another input and the voltage drops slightly on all the other modules. Even worse, when you’re plugging in a cable connected to a passive multiple the signal pin (tip) can get briefly shorted to ground as it’s inserted, resulting in a glitch on your output because all the inputs see that short circuit as well. Sometimes that sort of glitch effect might be what you want, but most often it’s not.
This module provides unity gain buffering to solve that problem, using an op-amp to ensure that each of the three output sockets tracks the input correctly, no matter how many modules it’s sent to and what load is put on it.
The bottom channel of the Video Mult is normalled to the upper channel, so you can also use this module as a six-output multiple by leaving the bottom input socket unconnected.
What You Get
The Video Mult comes as a PCB + Panel set for DIY, with no electronic components or panel sockets included. To build this module you will need to purchase all those bits as well and solder it together yourself. This is an great project for beginners, with just twenty-nine (all through-hole) components!
The information you’ll need to build this module can be found in the Video Mult Manual V0.4b.