Author Topic: synthy filters for guitar..  (Read 29791 times)

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deadastronaut

Re: synthy filters for guitar..
« Reply #60 on: September 19, 2013, 04:02:17 AM »
ok, for my next trick i shall be breading up the 9v ms20...and then adding lfo. :)

tinker, tinker...

http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
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^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

nocentelli

Re: synthy filters for guitar..
« Reply #61 on: September 19, 2013, 07:18:34 AM »
Excellent: Currently got another MS20 on the breadboard in an attempt to get an envelop filter out of it, but please share your LFO findings.
Quote from: kaycee
squeeze on the back and never open it up again

deadastronaut

Re: synthy filters for guitar..
« Reply #62 on: September 19, 2013, 07:50:45 AM »
okey dokey..will do.

breaded the ms20 twice with no joy though....hmmmm... ;)
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

nocentelli

Re: synthy filters for guitar..
« Reply #63 on: September 19, 2013, 11:04:02 AM »
Is it the Escobedo version you can't get to work? I used the Eric Archer schematic -

http://ericarcher.net/devices/diy-lpf/

I used the rail splitter and rail-to-rail opamp specified in the schematic, and initially had some confusion because the 4.5v vref supplied by the rail splitter is labelled as "0v" throughout the schematic. Once I got that sorted, it worked fine. You can omit the mix pot for guitar use, I just connected the 33k/10k junction from the OTA output to vref via a 10k to simulate 100% wet, and left off the dry path from the input->output mixer.
Quote from: kaycee
squeeze on the back and never open it up again

deadastronaut

Re: synthy filters for guitar..
« Reply #64 on: September 19, 2013, 12:03:31 PM »
Hi leo, yep its the escobedo. one......its still not having it, i'll attack it again later.....probably pilot error.. ::)


that eric archer one sounds cool,  but i have the bits for the escobedo one...

Haven't got  'darlingtons' and other IC....at the mo, so i'll persevere a little with this for now...


have you got your envelope going yet?..love to hear it.
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

garcho

Re:
« Reply #65 on: September 19, 2013, 12:43:30 PM »
D'Astro, check out the Cliff Schecht version. single side MS-20
"...and weird on top!"

deadastronaut

Re: synthy filters for guitar..
« Reply #66 on: September 19, 2013, 01:11:06 PM »
well i think i'll have to go with something other than  a 13700n filter...tried  4  IC's...breaded it 3 times ...no joy..bummer

i never had any joy with these IC's, even when i tried the mutron V a while ago either...so they are either fake or fried....or i am more dumb than i thought.. :)  (quite plausible)

anyway....

http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

garcho

Re: synthy filters for guitar..
« Reply #67 on: September 19, 2013, 01:42:30 PM »
Booooo! Sorry to hear.

Random online filter help:
Analog Filter Wizard, courtesy of Analog Devices.

"...and weird on top!"

deadastronaut

Re: synthy filters for guitar..
« Reply #68 on: September 19, 2013, 02:24:18 PM »
^ cool... 8) ;)
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

nick d

Re: synthy filters for guitar..
« Reply #69 on: September 19, 2013, 03:43:48 PM »
          I built an MS20-type filter using LM13700 in a synth/noise box with dual LFO's a while back , just tried it out with guitar . It actually sounds pretty good IMHO , especially if you like Hawkwind-type stuff . I have posted a clip on Youtube , should be up in a while . A minor complication regarding stomp-box use is that it runs on +/- 12 V , but I'm sure that can easily ( ! ) be sorted . The VCF is based on one from the EFM Wildcat synth , the LFO's are from MFOS , as is the noise generator . Very noisy , very lo-fi , very fun !

deadastronaut

Re: synthy filters for guitar..
« Reply #70 on: September 19, 2013, 03:47:29 PM »
^ yep i like old hawkwind stuff...and red shift, tangerine etc...i mess around with reason synths quite a bit too.. :icon_cool:

look  forward to hearing it man.. 8)


ive temporarily gone back to the dual Q&D for now...sounds pretty good..
« Last Edit: September 19, 2013, 03:50:36 PM by deadastronaut »
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

garcho

Re: synthy filters for guitar..
« Reply #71 on: September 19, 2013, 05:23:57 PM »
If you find a way to get the farty distortion down, let us know.
"...and weird on top!"

nick d

Re: synthy filters for guitar..
« Reply #72 on: September 20, 2013, 07:30:05 AM »
             Right , I have posted a clip on Youtube of this MS20 box . Can any of you wonderful people tell me in simple words how to link it to here ?
             I've had three tries , all I get is " Invalid Youtube link " . Please , help the Noob !

deadastronaut

Re: synthy filters for guitar..
« Reply #73 on: September 20, 2013, 09:31:05 AM »
copy the link at the top of your youtube vid  (url )...not share etc...

then choose youtube from here (top left)

then paste your copied  link between the brackets...
http://www.youtube.com/user/100roberthenry
http://deadastronaut.wix.com/index
https://deadastronaut.wixsite.com/effects

^ SPACE PATROL FUZZ/ NANO-8 MIDI DRUMS /CHASM REVERB / TREMSHIFTER / FAZE FILTER/ABDUCTOR II DELAY pcb's + WAH LIGHT PLATES. and sausa

nick d

Re: synthy filters for guitar..
« Reply #74 on: September 20, 2013, 10:16:00 AM »
[yohttp://www.youtube.com/watch?v=gTjcnvy31zI&feature=player_detailpageutube][/youtube]

       If I've got this right , you should see a demo of some MS20 tomfoolery ......

nick d

Re: synthy filters for guitar..
« Reply #75 on: September 20, 2013, 10:26:19 AM »

 

        Hmmmmmmm.......... nth time lucky ?!?!

nick d

Re: synthy filters for guitar..
« Reply #76 on: September 20, 2013, 10:40:32 AM »
      Ha ! It worked at  last ! Rob , you are a gentleman and a scholar !

      By way of explanation , the other boxes are :-

              Middle - by-pass loop switcher
              Left - BMP type fuzz
              Right - A boost , needed this to make up for a slight loss of volume at min resonance .

             The controls on the filter/LFO/noise box are marked and should be ( ? ) self-explanatory .
             The demo also includes oscillation at resonance and a bit of noise gen sillyness .
             

nocentelli

Re: synthy filters for guitar..
« Reply #77 on: September 20, 2013, 11:18:10 AM »
Cool vid - which MS20 schematic and which LFO did you use?
Quote from: kaycee
squeeze on the back and never open it up again

nick d

Re: synthy filters for guitar..
« Reply #78 on: September 20, 2013, 12:11:31 PM »
           I downloaded the EFM schematics from a site which I have totally forgotten the name of - the schemos had a lot of errors and missing values , so I had trouble getting it to work properly . The main snag was that the resonance control worked like an off/on switch !  Then recently , I found a synth site called Lushprojects - they do a module " Lushone " , which was practically identical apart from the resonance section . I made the appropriate mods , the end result is what you hear !
           The LFO's are from " MusicFrom Outer Space " -what a great site ! - look at the " Oldies but goodies " section - there is one called " Super-Simple LFO " - I used that but cut the Saw/Ramp bit . The NoiseGen is MFOS , not sure which one .
            If you look at any of these VCF's , the CV is input via a 100K res usually . To use multiple LFO's or other modulation sources like envelopes or exp. redals , just add more 100K's .
          I have not yet tried a 9V version , there is one a few posts back by Cliff Schecht - looks slighty more complex , but a similar idea . It has the bonus of a boost on the input , which would solve the problem I had .
          I think the only issue in using 9V instead of +/- 12 might be a smaller voltage swing from the LFO , giving a milder effect . Possibly reducing the 10K resistor(s) on the 13700 current inputs could fix this ?
          I am going to have a go at a 9V version , with more modulation possibilities - a triggered EG would be cool , perhaps a random LFO as well ? ???

garcho

Re: synthy filters for guitar..
« Reply #79 on: September 20, 2013, 12:36:28 PM »
Quote
The LFO's are from " MusicFrom Outer Space " -what a great site ! - look at the " Oldies but goodies " section

Most of his projects include LFOs, there's a ton of stuff on that site, don't be afraid to adapt some of that simple synth stuff to guitar.

Quote
I have not yet tried a 9V version , there is one a few posts back by Cliff Schecht - looks slighty more complex , but a similar idea.

That version has a nice single sided current source, it's a benefit of Cliff actually being an engineer.

Quote
I think the only issue in using 9V instead of +/- 12 might be a smaller voltage swing from the LFO

+/-12V = 24V. 9V = +/-4.5V. kinda big difference.

Quote
Possibly reducing the 10K resistor(s) on the 13700 current inputs could fix this ?

Be careful! Too much current and bye bye OTA
"...and weird on top!"