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Passive modules for DIY
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page 1, 2, 3  Next [all]
Author Passive modules for DIY
Voltage_Controller
Hi,

I just built a passive format converter (banana to 1/4") and have started a passive mult with attenuators. This of course has me excited to build more unpowered panels to flesh out my system with somewhat "quick" builds. Are there any other standard non-powered projects you all make?

Thanks!
onre
https://www.olegtron.com/olegtron-r2r-1

This is rather useful for all sorts of things.
jimboburgess
Switched multiples are handy. Just a bunch of ON-OFF-ON switches giving you banks to change signal direction quickly.

Attenuators as you are making. but you can make them attenuvertors pretty quiclky, http://www.bartonmusicalcircuits.com/atnmix/
FetidEye
on the doepfer diy page : http://www.doepfer.de/DIY/a100_diy.htm
are some cool circuits, such as passive filters, OR gates and more!
iopop
Check Definitive Passive Utilities Thread for some inspiration.

Those fixed Moog filters I'd really need to make some day.
unrecordings
Wow, I like that Olegtron R2R

In the meantime here are some passive circuits that I use:
unrecordings
And of course the classic Moog filter:

(Edit - somehow missed iopop's reply in my excitement)

unrecordings
iopop wrote:
Those fixed Moog filters I'd really need to make some day.


They're worth it - the only problem for me was getting a film 390nF capacitor, but you can use parallel capacitors to make up the value if need be
roglok
There's a comprehensive thread about this somewhere...

EDIT: found it - not as comprehensive as i remembered, though:
https://www.muffwiggler.com/forum/viewtopic.php?t=88096
Moos Gummi
Useful stuff in here!

Another cool thing is a passive ring modulator. It won´t fit behind a tiny Euro panel, but you can combine it with other passive stuff or just place it somewhere in the case and run wires to the panel.

Also this passive XOR looks interesting, though I haven´t tried it yet... Would be nice to use it together with diode AND/OR logic.

For the Moog filters, it might be useful to use the second tier of the switch as lag circuits, by copying the LP circuit with bigger capacitors. Picture file
unrecordings
Can you make a passive AND gate ? I thought you needed a positive rail for that one
Moos Gummi
Yes you´re right, I hang my head in shame...

But maybe having a passive OR/XOR would be about 2/3 as cool?
donpachi
http://liivatera.com/Products/Synthesisers/PassiveMultiple/#2

Passive switched multiple. Can be used as one or several multiples. Or to extend a connection for which a single patch cable would not suffice.
unrecordings
We've not mentioned passive ring modulators yet. I've a couple of them. Ken Stone offers boards (via Elby/Modular Addict/Synthcube etc) but like most passive circuits they're REALLY easy to hand wire with stripboard

http://www.cgs.synth.net/modules/cgsrr.html

And here are some more passive circuit I dug up from the archive including my take on the Tudor3:
SoundPool
I've got a whole bunch of easy passive project layouts here designed as "floating" PCBs with minijacks for my own projects. Also with mounting holes for those who want to build them into a pedal or put them behind some sort of panel or in a specific case. Maybe it is time I actually make them available to other folks...
unrecordings
SoundPool wrote:
I've got a whole bunch of easy passive project layouts here designed as "floating" PCBs with minijacks for my own projects. Also with mounting holes for those who want to build them into a pedal or put them behind some sort of panel or in a specific case. Maybe it is time I actually make them available to other folks...


That would be nice It's peanut butter jelly time!

Meanwhile I found a few more links buried away:

AMZ Website - lot's of diode based fun here
http://www.muzique.com/lab/main.htm

Sine to Square Converter - Might try this today (I'm thinking distortion!)
http://www.simplecircuitdiagram.com/241-self-powered-sine-wave-to-squa re-converter/

Simple Compressor - There's a few versions of this floating around the web
http://www.simplecircuitdiagram.com/16-self-powered-compressor/
Moos Gummi
I really like this thread, because for some stupid reasons I want to build a small case with only passives in it...

But how would you connect the original Tudor to anything else, as input and output are the same?
SoundPool
I think I'll send out at least one or two for prototyping this week. I was never sure if there was much interest and being a broke graduate student even some small side thing like this is a big time/money endeavor, but if folks find them useful maybe I'll do some small kit runs.

One of them is actually the Tudor 3 circuit, although I am afraid I haven't included your modifications we were emailing about in this version. Maybe I should try and squeeze them in or make an expanded/alternate version.
Also got a mini matrix mixer, some diode clippers, as well as a classic passive ring-mod with some extra little details.

unrecordings wrote:
SoundPool wrote:
I've got a whole bunch of easy passive project layouts here designed as "floating" PCBs with minijacks for my own projects. Also with mounting holes for those who want to build them into a pedal or put them behind some sort of panel or in a specific case. Maybe it is time I actually make them available to other folks...


That would be nice It's peanut butter jelly time!

Meanwhile I found a few more links buried away:

AMZ Website - lot's of diode based fun here
http://www.muzique.com/lab/main.htm

Sine to Square Converter - Might try this today (I'm thinking distortion!)
http://www.simplecircuitdiagram.com/241-self-powered-sine-wave-to-squa re-converter/

Simple Compressor - There's a few versions of this floating around the web
http://www.simplecircuitdiagram.com/16-self-powered-compressor/
SoundPool
Moos Gummi wrote:
I really like this thread, because for some stupid reasons I want to build a small case with only passives in it...

But how would you connect the original Tudor to anything else, as input and output are the same?


Just connect it using a splitter cable or wire two jacks to that same point - your input is also your output. It is intended for use in a feedback loop though- if it isn't in a feedback loop it doesn't do anything, and even then the effect isn't very overstated, although can be a bit more drastic depending on the dynamics of the system you are putting it into. Makes for some nice fun doing no-input mixing board stuff or in matrix mixer set ups.
Moos Gummi
Thanks for the heads up!

So I guess the modified versions will only work in feedback loops too?
SoundPool
yeah, feedback loops only, and don't expect something like a phaser effect, its more of a de-stabilizing circuit. so if your feedback loop is producing lots of high pitches, say like a simple no-input aux mixer feedback, putting the Tudor circuit in will alter the overtones/harmonics you are hearing.

if you want a passive phaser like effect better to go for a bandpass filter and then either sweep it by hand with a pot, or make it CVable with a vactrol or light sensor. I believe there was a guitar pedal company making a "passive wah" using that principle for a short time.

hmm I've got some 4069 chips sitting around, gonna have to give that sine to square converter a try
unrecordings
Yep the Tudor3 is more an instrument than an effect. You need to play it to coax subtle variations in the feedback loop that you're trying to manipulate

As for the Sine to Square - I just tested it on a simple kick/snare sequence. I need to calm down now before I record some - it's B R I L L I A N T

Edited to add Soundcloud demo:

[s]http://soundcloud.com/unrecordings/4069-distortion-test-1[/s]
SoundPool
very nice! just gave it a whirl... not sure if I'm doing it quite right haha. still need to replace my shoddy breadboard so I can never be 100% still if its that I have something wired wrong or if its just a bad connection. really great for experimenting, huh? I tried driving it out of the aux of my mixer playing some Eno through it and got some nice fuzzy distortion, but not these more square sounds- not sure if thats because of the source signal though. Direct from my ms20 mini I get nothing though, but it wasn't a particularly hot signal.

are you driving direct from a drum machine, or module?
unrecordings
I'm using drum modules and an MFOS mixer - you need a hot signal to really make it crunch. there's a simple test with a sine wave though - input the sine, if the signal is hot enough you'll get a pretty clean square wave out of it. It also seems to love a dynamic signal that crosses its input threshold. The article mentions that you can lower the input threshold with germanium diodes rather than silicon. In the demo I'm just switching things in/out of circuit - there's no fading, just the natural attack/decay of the circuit
jimboburgess
I came across this I think it's a piezo, a panel, a spring and a jack.

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