TREMMY TREMOLO

[duck_arse]

svf or srv?

[deadastronaut]

both probably..

ok,  a little issue has arisen, (as always)

i tried this with the xrock in front through my amp earlier, and then retested through my DI/mixer..

what it is , is this..

when my guitar volume is fully off i'm getting a (tremolo) induced oscillation (not tick) ...when i turn my guitar up slightly it fades off...

here's a clip of what i mean....xrock / tremolo......then added filter.....

https://dl.dropboxusercontent.com/u/7464107/noiseybugger.mp3

hmmmmmm.....ideas?..

updated schemo:

[samhay]

The LFO is probably throwing quite a lot of noise onto the ground and/or +9V supply - they do that. Your xrock uses high gain discrete transistor stages, which will amplify power supply noise.
You could add more filtering to your xrock - perhaps multiple resistor/cap combos - and/or hope it gets better when you box them up.

[deadastronaut]

cheers sam,

yep it was the xrock, i tried  my spitfire on it, (which i had to claw back from a friend ) totally fine...no issue at all so far..

so, for fun i might actually try a SVF on it while i'm at it....

i'm trying to reach page 104 to match the trem input cap..   edit ( which i notice i missed on schemo) 

[samhay]

Fair enough - add some/more power filtering to the xrock (and put it in a nice metal cage) and you should be ok.

SVFs are really cool, but this is going to cost you another 2-3 op-amps. Do you want the option of HP, LP and BP outputs?
Might as well throw the kitchen sink in and do envelope control of the LFO rate and/or depth. That aught to keep the thread going for a bit longer too.

[deadastronaut]

sorry getting mixed up...3 more opamps no way..

i mean the Q&D VCF...i messed with it on breadboard before and stripped away bits for uber simplicity.  ..i still have my experiment notes/schemo..

i remember i had a high and low version...


http://www.diystompboxes.com/smfforum/index.php?topic=89022.0;prev_next=next


saying that, i'm pretty happy with how it is at the mo really....see how i feel.

[deadastronaut]

right that's it...i'm done. i'm happy with it.

here's a layout ive been working on for 1590bb

5 pots / 3 switches.. i'm not using onboard pots as i want to be able to shift them about.. and the 3 switches will hold the board n place too..

my pedal layout will be like this : switches at the top, to avoid kicking.

pot order:  trem speed / vol  / trem depth.
                    filter speed   filter depth

  -  -  -
 0  0  0
  0  0  

just need to finalize pot values...

[duck_arse]

your above circuit diagram is missing C14 at "I" on the board. I'm assuming this is input dc blocking?

[deadastronaut]

yep i spotted that earlier...sorted..  

[samhay]

Looking good.

[deadastronaut]

cheers sam, i'm still getting used to eagle really..

its a bit involved , but worth the brainache to have a nice easy board to populate etc..

i just got sick of cutting pcb, printing, ironing,  etching, drilling ..the dust is just plain nasty...plus i only have a tiny space to work in

so my tools always have to be put away...i don't have the luxury of a nice workshop...

[samhay]

I know exactly how you feel Rob - I expect many of us in the UK (and Europe) are in the same boat.
Where are you planning on getting the boards made?

[deadastronaut]

i'l get em done at  seeed , i like the green pcb..

they are reasonably quick too...around 2 weeks roughly give or take a day or 2..3.. which is just long enough to get me thinking of another 100 page project..

[deadastronaut]

final clip...just showing the range of sounds etc..

https://dl.dropboxusercontent.com/u/7464107/tremshifterrange.mp3

[WhiskeyMadeMeDoIt]

Sounds fantastic!  I'm down for a board when / if you want to sell any.

[deadastronaut]

cheers man... yeah i'll do a few. after ive built / tested it. 

[bluebunny]

. . . just long enough to get me thinking of another 100 page project..

I'm not building this until we're at least up to page 26.     It's not a proper AstroProj unless I've changed jobs twice and grown a ponytail down to my backside.  

[deadastronaut]

 ... sounds about right.


i'll try harder to piss everyone off with my lengthy projects in future...honest,

[John Lyons]

Sounds good Rob.
I'm in for a couple PCBs when
you get to them, please.

[Keeb]

Great circuit as always!

I might breadboard this to try it out but solely based on the soundclips I'd be down for a board (or two if you'd rather do pairs).