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WIGGLING 'LITE' IN GUEST MODE

diode ladder pushes rope up a transistor ladder
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page 1, 2, 3, 4, 5  Next [all]
Author diode ladder pushes rope up a transistor ladder
andrewF
UPDATE 22/7/14 EURORACK PANELS IN STOCK
12hp AU$28
AU$5 shipping per order
pics below

UPDATE 18/1/2014 BUILD NOTES & BOM (750KB PDF)

UPDATE 10/1/14
boards in and tested, no layout errors though some resistor values could be tweaked to get it 'perfect', will be discussed in the build notes.
Boards are AU$18 each plus $5 for shipping
(whether you get 1 board or 10, shipping is $5 per parcel).
See below for pics and vids.

These are very tight boards with smd parts, probably not suitable for beginners, sorry!








There simply can never be too much sexual innuendo in modular synthesis.

Anyway, this is a circuit I wondered about for many months, eventually built one and it exceeded all my expectations.
Here's a basic description from http://www.sdiy.org/pinky/data/bp.html

Everybody loves the Moog ladder filter, right? TB-303 etc.....
And everyone loves the EMS diode ladder, the Pink Floyd characteristic synth sound, yeh?

So what happens when we mate these two filters?
No, I don't mean what are the offspring like
Lets just see them in coitus!

This circuit replaces the diodes and transistors of the ladders with opto-isolators.
The interesting effect is that the transistor filter does not need an audio input,
The audio from the diode ladder is sent across as infra-red light and turns on the transistors.

There are outputs for each filter, plus summed output and a difference output.
The difference output is quite unique, never heard anything like it.


There is a switch to swap the resonance feedback paths between the filters
which tends to make thing go a bit nuts.

Component values are not given as this is still in proto-type stage and some values WILL change, though most of the core sections are same as the origiinal designs, so not hard to work out.
Once fully fettled, PCBs and full schematic will be available. The PCB is 1.8 x 3.0", pots spacing 1", I made it as dense and compact as I could Mr. Green



This is a recording I made with the 1st version on breadboard



frequencycentral
Wild thing, I think I love you...
thebot
SlayerBadger! What an excellent idea!
paults
That's just.....wrong.
amdagan
Ooooooooooh yeah
This circuit tickles all my geeky erogenous zones, all at the same time. I don't even care what it sounds like, I'm in for 2!
2thick4uni
Probably the wildest filter since the Bi-N-Tic. I hope you matched the optocouplers for vbe hihi hihi hihi


.
decaying.sine
I sacrificed a chicken half way through, and we don't even have chickens here.
FetidEye
i think i'll need some VAZ(tm) to wiggle this !

Vaz is a form of artificial life, a constantly replicating nymphomation - Jeff Noon
falafelbiels
Raw...
Is that a euro format PCB again Andrew?
If so, I love you. Plus that must come along with my circlejerk order.
Jarno
That's nasty, I love it! SlayerBadger!
Isaiah



1000th post! It's peanut butter jelly time!
Paradigm X
Wow dense pcb

Liking four optocouplers for £1.10

Will have a listen when im at a pc with audio.
applause applause
Dego
SlayerBadger! You da man!
L-1
I like the PCB! applause
fluxmonkey
great stuff, perfect fit for the nonlinear assthetic. squonk on!
raisinbag
Ya man! That's sick love it. What r u gona call it? Something like "dubble penetration"? we're not worthy
LektroiD
That's a tasty piece of wizardry right there...

If this becomes available, put me on the list.
ben_hex
raisinbag wrote:
Ya man! That's sick love it. What r u gona call it? Something like "dubble penetration"? we're not worthy


The DP Filter! love
Pfurmel
MY ASS IS BLEEDING
DSC
I'm excited to build one trying different values. I imagine there have to be sweet spots! hyper
nihilist
GNARLY sounding filter.
I want one.
gbiz
Awesome applause
Barcode
Sounds fantastic! I want one.
emmaker
Looks like there is some unobtainium there. The TLP521s are EOL (End Of Life) on the Toshiba website. Mouser, Digikey and Allied Elec don't carry them here in the states. Newark has the TLP521-4 which is 4 devices in a package. So that might discourage some people.

Thanks for putting both the MOTM and Euro power connectors on the board.
Barcode
Furturlec has them for $.30 each.
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