TREMMY TREMOLO

[deadastronaut]

my latest addition to this is a variation on the inductorless wah too...just for kicks, (might end up being a ms20)

but heres the idea,..

2 lfo's...one for trem, and another for the filter changing 'over time'  with it (optional)

so you get:

trem   trem  trem  trem trem....(choppy)
whoooooshhhsssoooooohhw.......   (triangle)

be nice on the choppy square stuff, and the triangle too....hmmmmm...

which got me thinking....yeah i know..

as i have an lfo with triangle and square options already...bear with me ok, how about using the one lfo for doing both??...with some dodgy switching.

or do i need more pharmacy drugs and sleep..

heres what i have so far...very floydy..

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

[John Lyons]

Very nice Rob! That has a nice sound to it with the vocal setting.

[deadastronaut]

cheers john,

yeah its got that old floydy organ-ish sound...very cool.

instead of just having a trem why not have  little extra eh..

[samhay]

That sounds like the dog's bollocks.

[haveyouseenhim]

So when is the deadastronaut album coming out? I would like to pre-order my copy now.
Or do I have to keep cobbling together samples and making bootleg albums?

I'm serious, take my money!

[bluebunny]

or do i need more pharmacy drugs and sleep..

If this is what illness and drugs and alcohol does, then please remain a sick junkie (in a nice way, of course!) and keep coming up with these weird and fantastic ideas!

One of these days I'm gonna drive over to saaf-eass Lahnd'n and hunt ya down, and stick a bottle of Grouse down yer neck just to make sure you don't start doing boring stuff like a "booster"...                        

[deadastronaut]

cheers sam, yeah i love it too... i'll knock up a quickie schemo of how i have it at the mo before it gets lost in the random chaos of tweakery..

@mike: it'll never happen all the time i'm tinkering, ......but you never know.

i have a lot of tracks/songs like most people do i guess, but i never put them 'out there' as i'm never quite happy with the recording/mixing mostly ....one day maybe...


@marc: lol, different effects for different ailments, maybe i'll try and get malaria next, with a dash of herpes for good measure ,hmmmm  you never know what might come of it.... 80 hour delay, (that'll be fun testing)....

and yes you and the whiskey will be most welcome  

[deadastronaut]

heres the filter i used..

on the clip i just went straight into the filter and out... hooked up to one side of the ldr of the lfo  for the tremmy tremolo (red moon tremolo)



now i just need to work out a minimalist way of using the existing tremolo which is fine , and this filter switchable in/out...e.g normal trem/filter trem..

and also how to use the triangle wave side of things with the filter , whilst also using the square side of things to get the choppy but ramping up/down filter too..

greedy?...oh yes

any suggestions always welcome..(apart from sod off)

[deadastronaut]

complete schemo of what i'm up too...

[armdnrdy]

Hey Rob,

I've been working on a stereo panner/tremolo for the last month or so and I came across an issue with switching from a triangle wave to square wave.

The amplitude of the square wave is greater...which equates to the level when in "square wave mode" being a bit louder.

I took some voltage measurements and "tamed" the square wave with a voltage divider.

You can measure the voltage of the triangle and the square and calculate the voltage divider resistors to even things up.

On your drawing one side of the smaller value resistor would connect to the confluence of IC2 pin 3, R3, and the other side to SW1 pin 1. The larger value resistor would connect to SW1/smaller resistor and the other side to ground.

Check it out to see if there is a noticeable volume difference between the two waves.

[deadastronaut]

cheers larry, interesting, hmmmm..yeah the square does seem a tad louder now you mention it.

i'm guessing from what i want to do i'll end up having to have 2 seperate lfo's anyway...

so i could use them both for square/triangle too...but i would like them to be in sync with each other...(if i use a quad opamp i'm guessing they would be?) or would 2 sets of what i have be syncro'd anyway)

any good really slow to fast 'dual' lfo's about?...(avoiding the 555's)

[armdnrdy]

I don't think that two LFOs using one quad IC would be in sync. The slight variance in components would dictate different rates of oscillation.

[deadastronaut]

Hmmm thats what i thought...maybe enough for what i want though, as the filter part wouldn't really need a square wave...

anyway time for a very crude block diagram to better explain my intentions....make sense?.

[deadastronaut]

here's a clip of what i mean...( i added the choppy trem in soundforge just to get the idea..)




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

[samhay]

So you want the two effects in parallel?

[deadastronaut]

trem, and trem with filter option...

but squeezing a square and triangle for trem..

and a triangle only  for the filter..

[samhay]

The reason I ask is that you could use the first op-amp in the audio path as your filter. In this case, you would have the tremolo in series (after) the filter...

[deadastronaut]

yeah that sounds cool,

i thought about the opamp being the filter actually too , makes sense, ..but use the values for the twin T i was using ...


ian gord bless him   suggested an option of tapping off the square wav  pin1, and triangle pin7 from the existing lfo which makes sense too..(minimalist parts wise)

i tested that out by using an led from pin 1/7 ...

it works , i get square from pin 1 (led on/off) whilst my trem ldr led is triangle..(pulsing) nicely..

and when trem led is switched to square both are square...cool..

however all speed is obviously being controlled with the one pot, ......so no fast chop with an underlying slow filter..

interesting though.



edit:

wow, just wow...spent the last hour or so just rippin over this with the filter on a sloooow sweep with the xrock...seriously  nice..
for a laugh and temporaryness i joined the inputs opamp/filter and just came out of the filter...seriously nice, like having the filter/wah in front...but not. its after the drive, but still has that bite to it.....very cool.

[deadastronaut]

sam do you have a block diagram of how you would go about it?...

looks like i'm going to need 2 lfo's anyway...so i'll go from scratch.

[samhay]

You could arrange the audio section something like this.
We have to use an inverting op-amp if you want the classic wah treble cut along with the resonance peak. It won't sound exactly the same as the NPN version, but have a play with the value of R1, which sets the gain of the twin-T filter.
I couldn't figure how to switch the filter out in a very elegant way, but this should work. If you change R1, then make R6 the same value too.