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lalito
Joined: Sep 26, 2006 Posts: 9 Location: Manchester UK
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synthmonger
Joined: Nov 16, 2006 Posts: 578 Location: flada
Audio files: 3
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Posted: Fri Dec 01, 2006 8:48 am Post subject:
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Nice find! I'll have to try these out. |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Fri Dec 01, 2006 11:01 pm Post subject:
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i've seen those before. they look really cool. yeah, that cacophonator sounds awesome. and only 1 ic! |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Sat Dec 02, 2006 12:40 am Post subject:
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can you guys tell me the purpose of "SW2, CHARGE"? it's right above the battery:
is that the symbol for momentary? is it some sort of protection? i'm almost done with a pcb layout... thanks!
edit: sorry, i read the rest and it explained. "SW2 is provided to rapidly charge C7, which then discharges slowly into the circuit. In this mode, C7's diminishing voltage, in conjunction with a resistance selected with RV5, provides myriad interesting sonic effects for a period of several minutes."
sounds very cool! |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Sat Dec 02, 2006 3:21 am Post subject:
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okay, finished the layout. i haven't added SW2 yet, but i will soon. here ya go:
*see below posts for updated layout*
please let me know if you guys catch any errors. i made this sort of quickly, and it's my biggest layout attempt so far. thanks! Last edited by choklitlove on Sat Dec 02, 2006 11:21 pm; edited 1 time in total |
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The Alison Project
Joined: Jul 21, 2006 Posts: 187 Location: Canada
Audio files: 2
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Posted: Sat Dec 02, 2006 8:16 am Post subject:
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Here are a few things I noticed, no idea if they have been changed for a reason thou.
C4 - should be 4.7uF
C9 - should be 0.01uF
also C4 from the schematic is missing. |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
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Posted: Sat Dec 02, 2006 10:14 am Post subject:
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On the schematic, the oscillators on the bottom right, U1E and U1F need to be connected to the output buss with 10K resisitors, like the other four.
On second thought, maybe they are there to pull on the power supply voltage and act as some sort of modulators. _________________ --Howard
my music and other stuff |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Sat Dec 02, 2006 11:32 am Post subject:
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mosc wrote: | On the schematic, the oscillators on the bottom right, U1E and U1F need to be connected to the output buss with 10K resisitors, like the other four.
On second thought, maybe they are there to pull on the power supply voltage and act as some sort of modulators. |
i thot the same thing at first glance, but the text validates your "second thought"... compromise would be to add a couple switches to connect/disconnect 'em...
nice layout, matt, thanks! i'll probably just perfboard this one, but using your parts placement and routing... having your roadmap really helps, even if i do take a shortcut.
b |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
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Posted: Sat Dec 02, 2006 4:59 pm Post subject:
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I love circuits like this - very creative... _________________ --Howard
my music and other stuff |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Sat Dec 02, 2006 5:39 pm Post subject:
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sorry about the errors. i'm fixing as we speak. thanks for the help, and this will be ready to go very soon. |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Sat Dec 02, 2006 6:29 pm Post subject:
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updated:
*see below posts for updated layout*
thanks for the help and please let me know if you see any more. after looking at something for so long, you tend to miss things. thanks a lot! Last edited by choklitlove on Sat Dec 02, 2006 11:22 pm; edited 1 time in total |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Sat Dec 02, 2006 10:02 pm Post subject:
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i think c3 needs to go to pin 5 of IC1, not to pin 6?
b |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Sat Dec 02, 2006 10:34 pm Post subject:
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you're right. i feel like a moron. i'm on it...
thanks! |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Sat Dec 02, 2006 11:20 pm Post subject:
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updated again:
http://www.geocities.com/worthekik//cacophonator.html
thanks a lot you guys. i looked over it and couldn't find anything else, but evidently that's not saying much. i put a link to this topic on the page so everyone will know you guys helped. see any more? |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Fri Dec 08, 2006 9:03 pm Post subject:
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i built the cacaphonator this evening, pretty much following matt's PCB layout but hand-wired on perfboard. worked first time, a happy noizy little beastie. not quite the variety of tones as from ray wilsons' wacky project, but some interesting rhythmic spazms--they'll make a nice complementary couple.
i didn't have a 2200uf cap, so i paralleled 2 1000uf, with a switch between so i could select one or both... a worthwhile mod, in conjunction with the momentary power switch it gives a variety of "envelopes"--one of the keys to th coolness of the circuit is the gradual buildup of sound when you power up, and the gradual fade when you turn it off, thanks to those caps.
thanks to lalito for unearthing these, and choklitlove for the layout...
bbob |
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Coriolis
Joined: Apr 11, 2005 Posts: 616 Location: Stilling, Denmark
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Posted: Sun Dec 10, 2006 4:38 am Post subject:
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Quote: | didn't have a 2200uf cap, so i paralleled 2 1000uf, with a switch between so i could select one or both... a worthwhile mod, in conjunction with the momentary power switch it gives a variety of "envelopes"--one of the keys to th coolness of the circuit is the gradual buildup of sound when you power up, and the gradual fade when you turn it off, thanks to those caps. |
Hmm...how about turning that into a simple little A/R generator so you could the "build-up" and "turn-off" time? Does that make sense?
C |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Wed Dec 20, 2006 9:05 pm Post subject:
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bbob wrote: |
i didn't have a 2200uf cap, so i paralleled 2 1000uf, with a switch between so i could select one or both... a worthwhile mod, in conjunction with the momentary power switch it gives a variety of "envelopes"--one of the keys to th coolness of the circuit is the gradual buildup of sound when you power up, and the gradual fade when you turn it off, thanks to those caps. |
wouldn't it be possible to somehow install a pot to control exactly how much of the 2200uF is used? sort of selecting what stage of the envelope you'd like it to stay at? or even selecting different "sizes" or speeds of envelopes? i'm not sure if this is what Coriolis meant... i'm not even sure what i mean. |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Wed Dec 20, 2006 9:40 pm Post subject:
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or maybe having several momentary switches each using a different size capacitor in place of the 2200uF? that would be really fun... |
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fldrvr
Joined: Jul 13, 2006 Posts: 33 Location: USA
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Posted: Wed Jan 24, 2007 9:57 am Post subject:
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I don't understand why the layout calls for a DPDT. Wouldn't an SPST be enough?
Does anyone have any other sound samples? |
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choklitlove
Joined: Dec 23, 2005 Posts: 144 Location: Indiana
Audio files: 17
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Posted: Wed Jan 24, 2007 2:47 pm Post subject:
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fldrvr wrote: | I don't understand why the layout calls for a DPDT. Wouldn't an SPST be enough?
Does anyone have any other sound samples? |
both will work. actually, i think literally any kind of switch will work. i just wrote that because A: that's what i had a picture of, and B: i think a lot of people have a lot of DPDTs and use them for both SPST and DPDT purposes. but, yeah, any will work.
sorry, no more samples than on the theremin page that i'm aware of. |
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fldrvr
Joined: Jul 13, 2006 Posts: 33 Location: USA
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bobodamunkey
Joined: Jan 29, 2007 Posts: 12 Location: USA
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Posted: Thu Feb 08, 2007 1:36 pm Post subject:
Cacophonator |
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This is possibly a really stupid question but I am a newb so i am going to ask anyway. What are the voltages on the caps? I am sure i need to use some sort of standard but i have no idea so can someone clue me in on this?
Much appreciated |
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Fernando
Joined: Dec 30, 2006 Posts: 286 Location: Barcelona & Emporda, Spain
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Posted: Fri Feb 09, 2007 5:09 am Post subject:
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Maybe using a relay or something simpler we could control the event generation... so it won't be only manually triggered but triggered from other circuits on a synth....
bbob wrote: | i built the cacaphonator this evening, pretty much following matt's PCB layout but hand-wired on perfboard. worked first time, a happy noizy little beastie. not quite the variety of tones as from ray wilsons' wacky project, but some interesting rhythmic spazms--they'll make a nice complementary couple.
i didn't have a 2200uf cap, so i paralleled 2 1000uf, with a switch between so i could select one or both... a worthwhile mod, in conjunction with the momentary power switch it gives a variety of "envelopes"--one of the keys to th coolness of the circuit is the gradual buildup of sound when you power up, and the gradual fade when you turn it off, thanks to those caps.
thanks to lalito for unearthing these, and choklitlove for the layout...
bbob |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Fri Feb 09, 2007 5:20 am Post subject:
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It runs off a 9V battery, so 9*2 and round up to the next available value gives you 25V caps. (I'm sure 16V would be fine too, that's just the rule I use) _________________ What makes a space ours, is what we put there, and what we do there. |
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