On further note - given more thought earlier today, once I've successfully breadboarded Ian's for testing - I'm going to go with a dual version, ALONG with a 633 RM in the same panel. I bought 3 of the chips earlier this year. Figured it'd be a cool combination along with 2 of Ian's. (Full patching availability for mixes / etc.)
Good thinking... That will be a nice module. _________________ --Howard
my music and other stuff
On further note - given more thought earlier today, once I've successfully breadboarded Ian's for testing - I'm going to go with a dual version, ALONG with a 633 RM in the same panel. I bought 3 of the chips earlier this year. Figured it'd be a cool combination along with 2 of Ian's. (Full patching availability for mixes / etc.)
Good thinking... That will be a nice module.
Thanks much Howard! I'd originally thought of doing a triple ring mod. and that's why I'd ordered 3 of them. Now though, with Ian's great posting, I thought it to be cooler possibilities with 2 of his and 1 AD633 RM.
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
Posted: Mon Dec 03, 2007 2:31 pm Post subject:
So, I think I'm going to build a stripboard of this. It's tiny and will fit with minimal fuss in a rack panel with my SN-Voice pair. It really doesn't sound like anything else I have, it's cool and edgy. _________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated. Home,My Studio,and another view
btw.:
i have drawn a little pcb layout with Print mounted sockets and pot for Eurorack format. ( would also fit into a frac custom panel )
But it is without the CV input.
is that necessary ?
if anybody is interested for that _untested_ layout and _without_ the Cv input,
i can post it.
It is made with sprint layout 5 for which a read only version is free available at abacom
i will draw it with the CV input later.
On the actual layout there was no space to integrate it for fast
( the goal was the printmounting for the pot and the sockets because of fast building and much less errors )
ahh, it has 2 out sockets and one is with bypass switch ( that should also fit for a printmount switch )
ohh, and it has power connecters for Motm, Dotcom and doepfer.
Joined: Mar 07, 2007 Posts: 4579 Location: London, UK
Audio files: 172
Posted: Mon Dec 03, 2007 3:26 pm Post subject:
I think you should post it.
_________________ Garret: It's so retro.
EGM: What does retro mean to you?
Parker: Like, old and outdated. Home,My Studio,and another view
as sayed: absolutely untested.
Print it first out and check the circuit AND the spacings.
I will give it another look later ( maybe in January )
I'm into other projects now, and my frined who is etching for me has no time now.
this draw was just a spontaneous action
if the CV input is necessary i will redraw it then with that
analog XOR, EM.JPG
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screenshot of my drawing you find in the RAR file
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XORanalog, postet at EM.rar
Description:
My drawing is absolutely untested. Also the spacing for the Cliff minijacks, and the spacing for the print switch for bypassing. the link to the free viewer software is above
Escuse my Noob schematic Question here but I stumbled across this circuit and really want to put one together.
My question is regarding the shape pot(?) in the top right of the schematic.
Does this mean the wiper of the shape pot is wired to the + 12 rail and the Input is wired to the ground??
very confused.
and regarding the power symbols generally.... When they point up does this mean the positive rail and downward pointing symbols represent the -12 rail?
any clarification would be greatly appreciated, just when i thought I'd gotten the hang of reading simple schematics, it seems there are many ways and symbols for similar things
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
Posted: Sat Jan 08, 2011 10:17 pm Post subject:
Terrafractyl wrote:
Does this mean the wiper of the shape pot is wired to the + 12 rail and the Input is wired to the ground??
Ah, it means that the wiper is connected to one end of the pot thus forming a variable resistor. Afraid I don't remember which end. Try each and see which you like best.
Quote:
and regarding the power symbols generally.... When they point up does this mean the positive rail and downward pointing symbols represent the -12 rail?
Yes, that's the convention I use. It's quite common but not universal. Also the connections of the opamps to the power supplies are not shown when they are obvious.
Quote:
any clarification would be greatly appreciated, just when i thought I'd gotten the hang of reading simple schematics, it seems there are many ways and symbols for similar things
Yep, that's true. But after a while you will get the hang of the various notations and you won't even have to think about them.
Joined: Oct 11, 2004 Posts: 204 Location: London
Audio files: 1
G2 patch files: 1
Posted: Tue Mar 06, 2012 3:10 am Post subject:
Just finished this last night, Ian was king enough to let me post the pcb, i will fix a few little things, the part labeling and post it. Added a mixer, so i can mix the Xor'd with the dry ins, it did make sense somehow.
Forgot to decouple the xor, doh.
mixor.jpg
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Joined: Oct 11, 2004 Posts: 204 Location: London
Audio files: 1
G2 patch files: 1
Posted: Tue Mar 06, 2012 7:07 am Post subject:
the pcb. i couldn't print now, so if somebody could verify if it's the right size,
or have a fresh eye for errors that would be nice. for the mixer section you need to refer to Ken Stone's page, also used with permission.
Joined: Apr 20, 2016 Posts: 5 Location: Sydney, Australia
Posted: Sat Jul 02, 2016 9:46 pm Post subject:
So I did my own little PCB layout for this and built it as a 4hp Eurorack module. Works very nicely! No audio samples to share, but I'm rather enjoying feeding it audio rate pulse waves from my dual VCO, with an AR envelope prodding the mod input occasionally. I have nine unpopulated PCBs left, so will definitely build a couple more.
In the below pic it's the module with the bamboo panel. It's obscured by a patch cable but I put Ian's name on the panel
Joined: May 18, 2016 Posts: 91 Location: Texas, USA
Audio files: 2
Posted: Wed Jul 06, 2016 2:17 pm Post subject:
Hi all, pardon if this has been addressed already as I did not read the whole thread closely. I am just thinking that I've seen something that could be called an analog XOR in the training of a neural net to learn the XOR function.
Overtrained you get plateaus only with sharp transitions and undertrained you get smooth transitions between plateaus. You can plot it in 3D too.
Ah, I just looked on Google Images and found an example, shown in the attachment.
Joined: May 18, 2016 Posts: 91 Location: Texas, USA
Audio files: 2
Posted: Wed Jul 06, 2016 2:27 pm Post subject:
Actually, if this is correct - that a neural net XOR (two hidden layers usually and just a few neurons) transfer function makes cool sounds - then would it not be uber cool to make a panel with a neural net XOR all done in variable resistors so you could tweak the weights during a performance? Neat?
Joined: May 18, 2016 Posts: 91 Location: Texas, USA
Audio files: 2
Posted: Wed Jul 06, 2016 2:32 pm Post subject:
Here in this illustration we have a neural net topology with weights shown. A total of seven weights are required. That would be seven pots to adjust unless some were fixed or ganged. I can probably make a circuit using conductive filament for the weights on my 3D printer - how interesting an example to make!?!
Les
Nerual Net XOR Topology.jpg
Description:
Neural Net XOR block diagram - one of many implementations
Joined: May 18, 2016 Posts: 91 Location: Texas, USA
Audio files: 2
Posted: Wed Jul 06, 2016 3:11 pm Post subject:
In the attached photo I am showing three "finger potentiometers", suitable for panel designs, that are a bit of a misnomer as they are in fact variable resistors not potentiometers so really I need a better name. Anyway here is how they work:
Each finger pot has an underlying spiral of a colorful (in this case aqua translucent) insulating material. On top of this is 3D printed an electrically conducting layer that makes for 10 kOHm or higher resistance in the coils. Both ends of the dual spiral design have a circular electrical contact suitable for 3mm hardware or similar. With washers and spacers, even a metal panel can be used. The mechanical and electrical contact is made at these end points.
Once situated firmly in a panel, the operator can vary the electrical resistance between the terminals by pushing on the center of the spiral, squeezing the sides of the spiral, or some other deformation on the spiral. The goal is to short the layers and then slide along the shorted layers or short more layers, etc. to create a different resistance.
I have also thought of using the zig-zag resistor symbol to physically make resistors this way, isn't that neat? Well anyway you get the idea. This circuit, using a single quad opamp and 3D printed resistors, and three audio jacks would make for a great demo item, don't you think?
Les
Finger Pot 2 - 1 (3).jpg
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Three "finger potentiometers"
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Just built a dual one of these, and used the two spare op amps to make a third XOR, which is hard-wired to the outputs of the first two. In other words, you have A1 XOR A2, B1 XOR B2, and A XOR B available as outputs. To add to the sonic mayhem, the third also has an Input, so is actually a 3-input XOR.
Audio sample attached. First 20s are one output with two sine waves as input, tuned to be fairly harmonic slightly modulated by an LFO. Then two triangle waves, not harmonically related, VCOs driven by a sequencer. At 40s, it's the A XOR B XOR C output, run through a low-pass filter, with the cutoff driven by an LFO. Finally, at 1.34, it's a medley of all outputs through a mixer.
Love the sound of the 3rd part... the first part is also very nice... Makes me think it's time to include one of these in my setup... _________________ https://soundcloud.com/bastian-j
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(Full patching availability for mixes / etc.)
