TREMMY TREMOLO

[deadastronaut]

well ive been at the breadboard again...i know...i know....oh god not again!!!...

anyway, i was tinkering with the vico vibe, and it just didn't cut it imo...cool as the circuit is, i had issues..as had others.

so i came up with this..

it has nice on and bypass signal comparison , without tone sucking, or infamous volume drop, and behaves clean or with dirt....and doesn't distort when you whack it with a humbucker (we don't all play single coils )

and goes really slow to fast as ....

anyway i added a crude depth, but could be much improved

in fact on this clip at the very end i disengage the depth and you can tell it is has much more depth (choppier)...so the depth control could be much better. any ideas welcome

other than that its quite cool.

https://dl.dropboxusercontent.com/u/7464107/tremmytremolo1.mp3

[armdnrdy]

Hey Rob,

I didn't follow the other thread much but...
did you try a voltage divider "depth" pot between the speed pot and IC1B?

[deadastronaut]

cheers larry, i'll give that a go...

edit:

yeah its not adjusting  depth at all, i left the pot ground off too or it stops flashing altogether and goes quiet.

man your quick at editing..

[armdnrdy]

Just for kicks...

Try putting the depth pot (same config) in front of IC1B. (for isolation from the oscillator stage.)

Also...I left the designation and value on the pot when I quickly edited the drawing. The pot should be around 100K.

[deadastronaut]

in front of IC1B..?..

do you mean the 1k output side?.

[armdnrdy]

in front of IC1B..?..

do you mean the 1k output side?.

Yes...between pin 7 of IC1B and R6

[deadastronaut]

if i dim the leds it takes the whole level down..

[armdnrdy]

Well that' not good!

I would look for a different LFO to use.

You probably need separation between the oscillator and the depth and the depth and the LEDs.

Look at how the Mutron Phaser II LFO is implemented

[deadastronaut]

ahh i think ive got it,

the depth has to be in parallel with the ldr, i just changed the depth pot to 100k and seems much better...goes from completely off ( same as bypassed) to full depth

probably get away with a 47-50k..really

the lfo is fine, goes from really slow to fast...i swapped C4 for a 4.7uf, nicer 'useable'  range now too..

as a test i lifted the depth pot compared to full depth and there was no differences...brilliant!..



edit: thers a nice difference in shape with using a blue led, compared to a red diffused led, the red diffused has a nice softer pulse, wheras the blue is choppier..

[armdnrdy]

ahh i think ive got it,

the depth has to be in parallel with the ldr, i just changed the depth pot to 100k and seems much better...goes from completely off ( same as bypassed) to full depth

probably get away with a 47-50k..really

the lfo is fine, goes from really slow to fast...i swapped C4 for a 4.7uf, nicer 'useable'  range now too..

as a test i lifted the depth pot compared to full depth and there was no differences...brilliant!..

Good, good, good,

I don't really understand where you have it. is it where it was on you original drawing? just a higher value?

[deadastronaut]

yep as the first schemo, but just a 100k pot for depth  instead, and C4 at 4.7uf. done...swapping C4 will adjust the slowest speed , 22uf is funny, a really slooooow swell...just for fun.

but the 100k pot sorted it...proper choppy to subtle

behaves great with clean and dirt...excellent'e..

i haven't played with trems for ages, this is  goodun.  

[wildebelor]

this sounds really really good!!

[armdnrdy]

yep as the first schemo, but just a 100k pot for depth  instead,

That is one funky depth control placement! but...if it works!

[deadastronaut]

  ha ha,

cheers man, yeah it does..

having fun with the long swells.. xfuzz on synthy setting.into tremmy tremolo..

https://dl.dropboxusercontent.com/u/7464107/tremmy%20trem2.mp3

[wildebelor]

did not expect those sounds! Very versatile.
Do you have a layout or still breadboarding?
I think I might build a layout tonight if you don't have one

[deadastronaut]

still on bread....

i only decided to rip off the vico vibe from breadboard  and try this option this afternoon..

i cant be arsed with ordering reverse log pots, so i'll just wire them backwards....fully anti clock fast etc...for both.

bear that in mind..unless you have reverse log pots of course..

[midwayfair]

Try just using the Tremulus Lune's depth control (voltage divider between +9v, pin 7, and R6). It's already almost identical to the Lune's oscillator anyway, and then you can take advantage of the complete sweep of the vactrol instead of the max of maybe 50% attenuation you currently have. Of course, then it'll basically just be a two-knob Lune with the first stage inverting ...

You probably want a pF cap in the second op amp to head off ticking; you might also notice a difference with a buffer in front. And you may want a treble bypass across R8 (try something like 4.7nF and a 47K in series) to correct some of the treble loss you're no doubt getting with that input section.

[haveyouseenhim]

thers a nice difference in shape with using a blue led, compared to a red diffused led, the red diffused has a nice softer pulse, wheras the blue is choppier..

Maybe make those switchable for different settings?

[Crontox102098]

Sounds pretty clean and cool man!... that's all the depth? how i can get moooooore?

[deadastronaut]

Try just using the Tremulus Lune's depth control (voltage divider between +9v, pin 7, and R6). It's already almost identical to the Lune's oscillator anyway, and then you can take advantage of the complete sweep of the vactrol instead of the max of maybe 50% attenuation you currently have. Of course, then it'll basically just be a two-knob Lune with the first stage inverting ...

You probably want a pF cap in the second op amp to head off ticking; you might also notice a difference with a buffer in front. And you may want a treble bypass across R8 (try something like 4.7nF and a 47K in series) to correct some of the treble loss you're no doubt getting with that input section.

cheers john,

i just tried the 'lune' depth' but am not getting any depth control now...

am i right in thinking that the ldr would then go direct from IC1A pin 1.pin 6 IC2A?..

diagram?...i'm lost..