Does this effect pedal exist?

[strungout]

Hmmm, I was thinking the other day (happens, incurable) about an effect that would work similar to a tremolo in but would let me independantly dial in how long each part of the effect lasts. Example, hear sound for 1 second, cuts off for 2, etc. Does a pedal that does this already exist?

I found a two way time delay, 4 pins, settable on time and off time which sparked the thought (if anyone knows how that works or what each pin is for, I'd like to know. The sticker on it was ripped off, so no serial number or maker of anything...)  :x

Ciao.

[brett]

Hi.

I don't know of a pedal or design that does that, but it wouldn't be too hard to design something.  My concept is a low-frequency 555 driving a 4066 that would switch between the tremolo and clean signals.  

I've designed somehting that switches at higher frequencies (30 to 300Hz) between a signal and its inverse, to give a balanced modulator effect.  You might be able to borrow something from that design -it was called the modulatron and there should be a link in the archives somewhere.

have fun

[Nasse]

Yes, such tremolos with adjustable waveform or pulse width ratio exists. But times like two seconds dunno if commercial pedals can do that long :wink:

I think one custom boutique pedalmaker that posts here now and then has a *very* cool looking model with this kind of facilities, but just can´t remember the link...

But there is that "Variable Stuttering Pedal" thingie in GEO :roll:

[puretube]

the new E-H Pulsar (aka "re-issue") is capable to do this.
(i.i.r.c., from ~ 3 sec. max. on or off - could be modded, though -
to really very (almost inaudible) min. on or off).

Basically, (almost) any tremolo-circuit (or VCA) will be able to do it,
if you use a square-wave  LFO with variable "duty-cycle",
which can be easily found on synthesizer DIY websites.

original "new Pulsar" prototype graphics layout:



sorry, the actual schematic for it is a so-called trade-secret.

[ExpAnonColin]

A little while back I was trying to create such a device with an astable multivibrator, but triangle wave conversion got to be too much of  a hassle.

[strungout]

Cool, thnx for the ideas. I'm gonna check synth sites and see what I come up with.

Ciao.

[bwanasonic]

Zach Vex must be on the same wavelength as his next pedal is the *Seek-Trem*. I think the AdrenaLinn thing also performs a similar function ( sequenced tremelo patterns) .


Kerry M

[Rodgre]

I think the Adrenalinn does something interesting, as well as one of the Korg Electribe units.... programmable tremolo.

I had thought about trying to market such a thing years ago, and then I realized that I could never do such a thing.

What I do is use a noise gate with an external trigger. The external trigger is often a synth played by a sequencer. That sequencer will make the synth play (and it's always a hard and solid sound, like a simple squarewave oscillator with no attack or decay....on for as long as you play it and then OFF)

You play a quick 16th note arpeggio with the sequence and you will hear the guitar tremolo with a 16th note pattern (think How Soon is Now)  Take that concept and play a more rhythmic pattern with long notes and short notes.... and you can make all kinds of rhythmic tremolo patterns.

A little trick I stole from Chapterhouse and the Cocteau Twins back in the day. As heard on at least four Curtain Society tracks.

Roger

[Mark Hammer]

Go here: http://www.musicfromouterspace.com/analogsynth/synthdiy_links.html

You'll find links to plenty of DIY synth sites (with a few commercial places thrown in).  Ray Wilson's page itself has some suitable designs.

Any 2-opamp LFO puts out a square and a triangle waveform.  Normally, it is the triangle waveform that is tapped and used to modulate things, but the square-wave output is there for the taking.  If one varies the duty-cycle (i.e, how long the squarewave goes positive-vs-negative) that produces ramp waves of different slopes at the triangle output, but it also produces different on/off times at the square wave output.

One question you will inevitably have to contend with is whether you want things to change immediately, or have some "rounding" of the variable-duty waveform so that there is a slight fading-in at the transition point.  If you use the LFO to control LDRs, and select the LDRs for their response times, that rounding can be introduced without additional circuitry by the LDRs themselves.  I think you'd want something not too fast and not too slow.  On the other hand, depending on what it is you want to vary, LDRs may well be impractical.