Author Topic: TREMMY TREMOLO (Read 59440 times)

deadastronaut · « **Reply #140 on:** June 15, 2014, 06:02:12 PM »

aha...

had a mad revelation just now...

i was talking about getting the sweep but without the dip in volume (especially with distortion)..

i found a good kludge , the filter lfo's voltage divider (2x220k's) seems to be the key,

raising the 220k to ground from 220k to 1M (via a pot) stops the lfo led from dipping and dragging the vol with it,..

so a 220k as normal but with a pot in series works.....seems kinda obvious now ive tried it....acts as per normal, and sounds quite phasey now too...pretty sweet.

deadastronaut · « **Reply #141 on:** June 17, 2014, 06:37:49 AM »

ok heres what i have now...the filter depth is pretty cool now, pretty unorthadox, but it works nicely to go from deep sweep, to subtle.

duck_arse · « **Reply #142 on:** June 17, 2014, 10:45:22 AM »

there is something missing from IC1A in the N/C position. no feedback?

deadastronaut · « **Reply #143 on:** June 17, 2014, 10:46:56 AM »

well spotted...

must've been when i was swapping the switch position...cheers man.

deadastronaut · « **Reply #144 on:** June 17, 2014, 12:16:11 PM »

i was tinkering with filter caps...with a pot, but did'nt get desired results..

to sweep from fat to thin

10n lug3........
signal lug2...../\ \/
\/ ..........
1nf lug1......../\

then realised my pot is messing it up..

easier way?..

deadastronaut · « **Reply #145 on:** June 24, 2014, 06:23:33 AM »

ok, with the help of sam, cheers man.

i now have cap selection in the filter...

2.2n / 4.7n / 10n...the clips are in that order....apart from the noodly bit on the very end which is in reverse order

..

https://dl.dropboxusercontent.com/u/7464107/2.2n-4.7n-10n%20filter%20tsts.mp3

might have a little noodle around with the values still...but getting there..

samhay · « **Reply #146 on:** June 24, 2014, 08:45:43 AM »

Doesn't sound too bad. Perhaps try a 3n3 in place of the 4n7?

deadastronaut · « **Reply #147 on:** June 24, 2014, 09:05:20 AM »

will do, yeah it needs a tinker to get a nice 3 way range i'm happy with....

deadastronaut · « **Reply #148 on:** June 24, 2014, 09:37:33 AM »

2.2n/3.3n/10n...seems ok.. tried a 6.8n , but 10n seems fine now...

deadastronaut · « **Reply #149 on:** June 24, 2014, 09:57:01 AM »

our dear old friend mr switch poppo is back in town

...i thought i'd sorted that but obviously not..

typical , sort one thing then.......

edit a 1M across the switch seems to have tamed it....better way?

edit: i'm knocking up a layout in eagle..i fancy i'll get a few boards fabbed instead of my usual off board nightmares..

i'll still have off board pots though..can't be arsed to order them, or fanny about, and reduce size/cost etc...but the onboard switches will hold it nicely anyway too...hmmmm..

(if i can get eagle to behave that is

)

John Lyons · « **Reply #150 on:** June 25, 2014, 09:25:15 PM »

Sounds good Rob. I'd like to try this one.

deadastronaut · « **Reply #151 on:** June 26, 2014, 05:14:36 AM »

^ sure thing man..

cap switch pop: (as schemo above)

its a strange one this time around,

sometimes it pops, sometimes it doesn't...

i'm beginning to think its a switch ground issue as when i hold the switch by the metal part the pop is almost gone..

whereas if i hold it by the plastic...pop.pop.pop...

however..

sometimes the pop is on the first click, then doesn't after...meaning the caps are now drained?....hmmmmm

tried a 1M across the switch, but the same result?...any solutions/ideas?...

just want to make sure i iron out this possible issue before doing a final layout etc...

bluebunny · « **Reply #152 on:** June 26, 2014, 07:54:47 AM »

I'm assuming we're talking about "CAPSW" in your pic, Rob? I guess you could take a BFR from each of the "floating" side of those two caps (C11, C12) to ground, just like you do with the input decoupling cap in yer average pedal. Not sure if this would affect the operation of the pedal, but it would allow the caps to discharge quietly to ground, rather than sitting there all charged up with no place to go.

Or am I talking B0ll0x?

deadastronaut · « **Reply #153 on:** June 26, 2014, 08:11:36 AM »

yes you are..again

yep CAPSW..

BFR?..

edit: I tried 1M resistors to ground on both floating caps...still pops.

samhay · « **Reply #154 on:** June 26, 2014, 08:27:46 AM »

Dont take the big f**king resistors to ground - they need to go to Vref.
Not sure what this will do to the frequency response of the filter, you I guess you will find out.

deadastronaut · « **Reply #155 on:** June 26, 2014, 08:48:38 AM »

B @#$%ing Resistor...

i might have known..

cool, just tried BFR 1M resistors from floating cap to vref...voila', excellente' silencio'.....sam is spoiling us..ferrero is in the post..

works a treat...brilliant. filters seem ok too...cheers sam.

bluebunny · « **Reply #156 on:** June 26, 2014, 09:43:23 AM »

Quote from: deadastronaut on June 26, 2014, 08:11:36 AM

yes you are..again

Ha ha!

Yeah, what Sam said - small brain-fart earlier: V_REF makes much more sense. Ground would be plain daft.

Who the *£$% suggested that??

deadastronaut · « **Reply #157 on:** July 01, 2014, 05:27:59 AM »

well after much testing i finally settled on cap values...

gives a nice bright/med/warm range for clean or distortion...

i decided to include the 22pf (maybe 47pf) in the switching too. to not taint the tremolo.

samhay · « **Reply #158 on:** July 01, 2014, 05:51:15 AM »

Well we're only up to page 8 of this thread. You're not done already are you?

deadastronaut · « **Reply #159 on:** July 01, 2014, 05:53:32 AM »

no way...

ive got a SVF to try yet...

.........................maybe.

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Author Topic: TREMMY TREMOLO (Read 59440 times)