I guess a “canonical” attenuverter input reference would be nice to have?
There are some basic circuits in the Cadet schematics. We’re moving to all active signal paths moving forward, so an attenuverter is a dual discrete VCA with a special buffered driver circuit from the pot. I’m not quite ready to publish that circuit, but I’ll think about it.
I’m slightly confused as to why the bypass caps are drawn with resistor symbols, but apart from that this is fantastic.
Hah, me too! I must have made a drafting error.
Any thoughts in the long term for a +/-5V psu connector standard?
I very much feel the need to be euro compatible, but burning more than half the power in a power hungry design in linregs feels wasteful.
Lots of thoughts. I had considered a 4-pin Molex MicroFIT connector (an actual power connector, unlike ribbon cables.)
We’ve got switching +/-12V to +/-5.5V followed by high grade RF +/-5V LDOs on power entry to some new prototypes.
The question is very complicated – in the end, for us any product for the modular line we release would need to support both +/-5V and +/-12V even if some sort of alternate connector were offered. We’ve thought about various types of “EuroRack to +/-5V” adapters and plugin assemblies, but all the cost engineering ends up pointing back to nominal differences in costs and a big jump in user frustration with dealing with multiple standards.
One approach is the Roland Aira method, which used only the +12V power rail (available on EuroRack supplies) and switch that to +/-5.5V, then drop with LDOs. It is similar to the approaches we’re testing now, but currently we’re trying to source the negative current from the negative rail to maximize the EuroRack power supply.
So it’s most likely we’ll work around the existing standard, which is +/-12V input. The most important priority for me is that the modules perform really well under any conditions (even bad EuroRack power supplies.) If there’s a strong push for it, we could document a +/-5V (or +/-6V, for LDO entry per module, which is ideal) connector. I’d rather do that than see a branching standard emerge.
Let me know your thoughts if you are seriously considering developing modules under the standard!