Author Topic: synthy filters for guitar..  (Read 31775 times)

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nick d

Re: synthy filters for guitar..
« Reply #100 on: September 26, 2013, 07:12:42 PM »
                                                 

                         Amended schematic , old-school cut'n'paste using real scissors . Also added control labels and
                          + and - inputs to second half of 13700 . And switched flash on .
                         

                          Yeah , you can max the resonance and play sirens with the LFO , no bother !

nick d

Re: synthy filters for guitar..
« Reply #101 on: September 26, 2013, 07:28:09 PM »
           Oh dear , it really isn't my day , is it ?   + and - inputs , I accidentally swapped them .
           
            Pin 14 is + , i.e. non-inverting , 13 is - , i.e. inverting .

            Fingers crossed , it's all correct now .

nocentelli

Re: synthy filters for guitar..
« Reply #102 on: September 27, 2013, 01:08:34 AM »
 Oh dear , it really isn't my day , is it ?   + and - inputs , I accidentally swapped them .
           
Pin 14 is + , i.e. non-inverting , 13 is - , i.e. inverting .

Fingers crossed , it's all correct now .

So the connections you've drawn are correct, just the + and - labels are swapped?
Quote from: kaycee
squeeze on the back and never open it up again

nick d

Re: synthy filters for guitar..
« Reply #103 on: September 27, 2013, 07:25:57 AM »
            Yeah , pin 13 goes to 10k to pin 9 , pin 14 is from the 10k that comes from pin 8 .
           
             Checked against my 12 V schem and the rats nest on the breadboard , which works !

nocentelli

Re: synthy filters for guitar..
« Reply #104 on: September 29, 2013, 06:08:34 AM »
Just logged in to say I layed out this circuit last night and had a quick play this morning and it works fine. I could do with a little more resonance, but I'll have a play with the "feedback" opamp and see if I can get a bit more. I'm going to try it with the envelope detector section from the BJFE snow white autowah, which looks like just drop in there. Thanks, nick d.
Quote from: kaycee
squeeze on the back and never open it up again

deadastronaut

Re: synthy filters for guitar..
« Reply #105 on: September 29, 2013, 06:11:55 AM »
cool, look forward to hearing your results... 8)

(waiting on my 13700's..)
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 #106 on: September 29, 2013, 06:22:35 AM »
               Got a bit further on with this . Video demo included , you may wish to cover your ears .
                
                  Two LFO's tried , value of C changed to 47nF . Vr now from a buffer using similar circuit as for filter Vref .
                   - this is definitely an improvement .
                
                 Added buffer/boost to input to counter volume drop . This works a treat , straight lift from the Cliff Schecht
                   design .
          
                 The LFO's definitely need level controls , particularly for fast rates . Not done this yet , I'm thinking a 47k pot
                    if using a 33k resistor , and the bottom end of the pot should be Vr , NOT Gnd ?

          
« Last Edit: September 29, 2013, 06:24:10 AM by nick d »

nick d

Re: synthy filters for guitar..
« Reply #107 on: September 29, 2013, 06:29:17 AM »
[youtubehttp://www.youtube.com/watch?v=9UY-fVUos2E&feature=player_detailpage][/youtube]

deadastronaut

Re: synthy filters for guitar..
« Reply #108 on: September 29, 2013, 06:30:56 AM »
Here ya go.. ;)

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 #109 on: September 29, 2013, 06:35:35 AM »
       Cheers Rob !  @ nocentelli , no lack of resonance here , too much if anything !

deadastronaut

Re: synthy filters for guitar..
« Reply #110 on: September 29, 2013, 06:38:17 AM »
@nick, sounds really great man..great slow sweep.....that'll be nice with an envelope detect too...awesome. :icon_cool: :icon_cool: :icon_cool:
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 #111 on: September 29, 2013, 07:07:40 AM »
                Thanks Rob ! Yeah , that long sweep is mega , with the res well up . I'm looking at envelopes
                 too - either follower or triggered . There's a fairly simple ( ! ) on  MFOS in the Noise Toaster
                 project , might be good with a momentary stomp to fire a one-off Attack/Release sweep .

nocentelli

Re: synthy filters for guitar..
« Reply #112 on: September 29, 2013, 08:39:16 AM »
I'll check over mine carefully this afternoon, problem just user error.
Quote from: kaycee
squeeze on the back and never open it up again

nick d

Re: synthy filters for guitar..
« Reply #113 on: September 29, 2013, 08:54:26 AM »
             With my values ( 47k pot + 12k res ) , the resonance increases up to around 90% pot rotation ,
              then oscillation kicks in .  I found two things that kill the resonance while I was wiring up - either
              the bottom end of the resonance pot , OR the 4k7 from IC3 , pin 2 not connected to Vref .

deadastronaut

Re: synthy filters for guitar..
« Reply #114 on: November 24, 2013, 08:48:02 PM »
@nick: just listened to the vid again...really nice. 8)

did you get any further with this?.
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 #115 on: November 25, 2013, 09:10:20 AM »
    I am in the process of a final build - basically the circuit from the demo with a few minor tweaks , plus an expression pedal jack  .
    Didn't get any further with envelopes - it's an eight-knobber as it is !
   
   When it's done I'll post pics , clips and schemo . The vero is fairly huge and sprawling , so I won't attempt to draw that up , I'm
   sure someone else will do a neater job !
   
   

deadastronaut

Re: synthy filters for guitar..
« Reply #116 on: November 25, 2013, 11:21:20 AM »
8 knobs  :icon_eek:

lfo leds?

lfo volumes?.

anyway, cool, look forward to the build demo man... 8)

i now have my 13700's..
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 #117 on: November 25, 2013, 11:50:48 AM »
  Two LFO's , each with level and rate pots  and LED , resonance , filter frequency , input boost , output level . The input boost is set-and-forget so could be a trimmer , but it just adds a bit of flexibility . I might add another jack for external CV , so envelopes , sequencer , random etc. could be added later . That's what voltage control as all about !

deadastronaut

Re: synthy filters for guitar..
« Reply #118 on: November 25, 2013, 12:18:33 PM »
very nice... 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

Strategy

Re: synthy filters for guitar..
« Reply #119 on: November 26, 2013, 03:19:39 PM »
well done! is this HP and LP together like original MS20, or just LP?

very nice... 8)