I HAVE CONSTRUCTED A MAGNETO-DYNAMIC INFUNDIBULATOR

[jinxtigr]

https://www.youtube.com/watch?v=1cdXNJROg4c

I HAVE CONSTRUCTED A MAGNETO-DYNAMIC INFUNDIBULATOR

*ahem!*

No, seriously, I have! Watch the video and you can construct one too! You'll need an XLR cable, a transformer (like a 600 ohm telephone transformer with three windings), some little diodes like stompboxes use for clipping, and a teeny capacitor. Two of everything, for stereo. You'll want a soldering iron (if needed, I can make a How To Solder video) and either a multimeter, or in a pinch, guitar cables and some kind of amp (as shown in the video). With these, you too can build what I've built.

This is a real thing. It's inspired by the $3500 Gyraf Audio G21 "Magneto-Dynamic Infundibulum". That is much better than this, much like a vintage Klon Centaur is much better than a modern MXR Distortion+ bought off Amazon.

But, you probably can't have a Gyraf Audio Magneto-Dynamic Infundibulum (or a vintage Klon Centaur). And if you could, you're probably not watching my videos. But you can have a magneto-dynamic infundibulator! And what's more, you can use it: the homebrew version performs very respectably considering its humble origins. It leaves a lot out, but since you're homebuilding it, you can experiment and see how many features of the Infundibulum you can incorporate. This device follows consistent principles, which I explain. It's all in the video!

This sort of thing is supported by my Patreon. Support that, and I will construct again! I'm not sure if I'll end up with anything quite this impressive, but let it be known that I've never been only about the software and plugins. I've developed everything from stompboxes to speaker designs (the SubKick video shows glimpses of some speakers I've made, you might not have noticed what they are since they're so huge and strange) and I would love to bring my patrons along for the ride

[Sound Author]

This is crazy stupid cool!

[jinxtigr]

Glad ya like it! Tell people

[Havok]

Have you got a link to buy a suitable transformer for This? Could I use a quadfilar transformer and just use 3 of the windings?

[jinxtigr]

Have you got a link to buy a suitable transformer for This? Could I use a quadfilar transformer and just use 3 of the windings?

No, but you can certainly use 3 of a 4-winding transformer. And wire the extra two together, for extra inductance on your control coil. And you should totally experiment, I made these out of telephone line matching transformers for a reason. Find some surplus transformers and see what you can make.

The important part is, the plus and minus (tip and ring, part of a balanced mic cable) go through the transformer, not into an isolating coil. The wires go through to the other end, probably rather little series resistance. And you wire them so you get maximum output (I think that will equate to both of the wires driving the transformer core the same way, and that if they're fighting each other it will be less output at least at quiet levels, almost certainly less highs?) with the intention to drive the transformer core, but with wires that go straight through, not wires that form isolation coils.

[Jim Y]

Very interesting...
But I for one need a proper wiring schematic, especially to show the transformer wiring.
Usually, if it has 6 pins, the transformer is like this...

This is an ordinary type of 600ohm audio transformer with 2 centre tapped windings. Not 3 or 4, but only 2 windings. Electrically, having the centre tap pins does not make it exactly like another winding - but I'm not saying that isn't what you have or it can't work!
Note that the 3 pins on the side marked P (primary) are pins 1,2 & 3 as the schematic, so the other side has 3 pins 4,5 &6 of the Secondary.

So, it really needs a similar diagram for the transformer used for it to make sense or another brands transformer to be found.
If you have a multimeter, the resistance function can show you which pins of a transformer are part of the same winding and show if, indeed, signal is purely passing through the winding wire or across windings via magnetic coupling.

[Jim Y]

It could be this? I'm not sure.

[Havok]

I don't think that will work, you need separated windings for each path. I've found some 1:1:1 telecoms transformers that I think will do the trick, they are setup like this, with the primary being equal to each secondary:



https://uk.rs-online.com/web/c/power-su ... 4294690518

I've got a Sowter 9165 and a Cinemag CMOQ-2S for a build I'm in the middle of so plan on giving them a go too

[Jim Y]

Well found. I think that would probably fit.
One of the few clues in the OP is the hot & cold paths from side to side of the package.
So you use secondary wingings 3 to 4 and 5 to 6 for the signal hot & cold paths and the primary coil 1 to 2 for the "control" or whatever it does.