Vico Vibe problem

[duck_arse]

DA how vital is the 6v1 zener?...any other option as i haven't one?.

i'm just breading it for the crack..

schemo:
http://revolutiondeux.blogspot.co.uk/2012/06/jordan-vico-vibe-tremolo.html

yer, I was hoping for a different diagram.

if by DA you mean me, I'd say the zener is just providing a stable bias for Q1. the 1M pot (which can be anything, 50K upwards) is just dividing and applying to the base. so any voltage you've got will work, to some degree, use 3 blue leds if you like (what's their Vf?) I'm still not sure about that osc circuit, the 560k feedbacker looks a bit low, and there is a resistor to ground (in every other version of this osc I've seen) missing.

I'll bb tomorrow maybe.

[edit :] I instead redrew it tonight. now it looks suspiciously like a twin-tee, like in a kay trem, not a phase shift. my bad. if there was some sort of little drawing of a red face, I would put it ....... here.

[deadastronaut]

cheers man,  i used 3 blue superbrights leds...works ok,

but i swapped the 220k for a 470r...much much better deeper depth the 220k really held it back. .  plus 33k instead of 39k, tinker tinker...

swapped one of the 560k for a 4.7M now it goes from really low to fast...much better.

cool simple little circuit to tinker with.  

there is a large vol drop though when bypassed (on TB breadboard)....and thumping even at original values...

i read somewhere that a guy put a fet preamp in front to lift it..

[Renegadrian]

Ok you got it thumping too!!! Strange thing is...I got the mahoney one and it fu..in' doesn't thump at all!!! grrr

[deadastronaut]

adriano i stuck a 3904 in Q2 no more thump..

i think it prefers a lesser gain tranny...

i'm tinkering with moving the depth as its pretty poor really...

[Davelectro]

I built this pedal a couple of years ago; all in all it's a cool sounding circuit.

Two major problems:

1. The oscillator. It goes from fast to...stupidly fast.

(BTW, I remember the oscillator refused to work with mid gain transistors such as 2n2222 or 2n3904. I had to use a 2N5088)

2. The clumsiness on both controls. "Speed" needs an antilog pot really bad, but I think "Depth" may benefit from a C taper as well.

[deadastronaut]

yep the depth is next to useless....the speed isnt too bad when swapping caps etc, but no real control of depth is a big issue..

anyway,  i used a 2n2222 in Q1  and a 3904 Q2 and there is no 'thump' whatsoever,  even with my mixer right up...

whereas with the 5088's it was as noisey as a noisey thing on national lets be noisey day...

its a cool little circuit, but i think its a bit of a balancing act to get it to behave...

[duck_arse]

one of you blokes fooling with this should swap the osc for a phase shift osc, like I originally thought it was. it should only mean shifting the resistors/values and caps. see what happens then.

changing the 3 100nF caps to 220nF or maybe 330nF will reduce to only nearly crazy fast. and how are you tuning the bias pot, does it not affect depth range?

[spelling] I wish I could leave my original typings in, I hadda "phase sh1t osc" and "cray fast". dunno how fast a cray would be. [/spelling]

[deadastronaut]

D,A i gave up on this annoying little cool circuit , and thought sod it, and decided to  design my own

preamp-vol, depth and speed...lovely. no more vol sucking....and not a thump in sight.

i have a nice siney thing gong on, but i'm going to try to add a square too...man i love breadboarding.

basically i made a preamp, (this goes loud) then lifted my lfo from the abductor delay, and whacked 2 leds in series, one with an ldr to ground via a 5k pot for depth....sounds pretty cool.




sucks a little top end tone though...other than that its ok, the speed is all bunched at one end of a 1M pot, but a 500K/1M reversed will be fine.  tinker tiinker..


hold on , link wont work due to censorship...

https://dl.dropboxusercontent.com/u/7464107/tremoshtt1.mp3

[duck_arse]

now, you just know that's not going to play on my machine, don't you?

[deadastronaut]

  why not, its just mp3...

heres another you can't play...ha ha,  ridiculously fast to slooooooow...

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

[duck_arse]

well, "just an mp3" is quite a challenge on "just a linux box". but don't worry, I managed to hear both files. I even looked at your abductor (and the name just this second made sense with the graphics), no real circuit? can you give a hint for the oscillator you used?

[deadastronaut]

i'll knock up a schemo when i can later, i'll start a new thread rather than hijacking the vico vibe, that isn't really a vibe...

off to cook dinner and wine and dine mrs astro in a bit...while i'm driniking i'll think of a name for it..wine always inspires.me

[pappasmurfsharem]

well, "just an mp3" is quite a challenge on "just a linux box". but don't worry, I managed to hear both files. I even looked at your abductor (and the name just this second made sense with the graphics), no real circuit? can you give a hint for the oscillator you used?

Do you not have VLC?

[LucifersTrip]

I posted details on the other forum when I built the VV. For me, it's one of the better trem type effects for fuzzes (along with the Vox Repeat Percussion), since it can get really sharp and choppy and keep the definition.

I tweaked mine to get a better and fuller depth control plus I removed the 3.3K for full speed (a straight line). The only thing I didn't do was spend much time trying to slow it down.
Unfortunately, increasing the size of the rate pot doesn't do it. The effect will actually stop. Though, in the thread (fsb), I think it continued with other ways to slow it down.
I never had a problem with "thumping" or any distortion (like with the Kay).

Here's the version I went with back then, with voltages:

[Davelectro]

Yeah, it does sound good for such a simple circuit. Clearly it's not a vibe but there's something vibe-y going on, nevertheless (I guess it may have to do with its crazy speed range).

[duck_arse]

well, "just an mp3" is quite a challenge on "just a linux box". but don't worry, I managed to hear both files. I even looked at your abductor (and the name just this second made sense with the graphics), no real circuit? can you give a hint for the oscillator you used?

Do you not have VLC?

that is a cruel thing to say, pappasmurf, and you know it. I had vlc. couldn't get plug-ins to play in opera, asked ubuntu to load the forbidden extras, and it unloaded vlc for me. incompatible, or something. stuff now plays, plug-ins do, but it still taks a lot of swearing for some things. like mp3.

[duck_arse]

lucifer, I too played with this, and ended up with very similar results. so I redrew the circuit, and so I'm going to post it.


like you showed, I ditched the depth pot for a fixed R, and used the bias pot for "depth". it seems the circuit runs best at full depth, with the bias shifting the tone from trem to helicopter chop. almost a burst box candidate. I added an electro across the zener, because that's what we're supposed to do.

for the thumpers, I noticed none at all. sounds like furr if you turn the amp right up w/ no signal. I used 2nd law transistors, hFE ~300, no problem.

and bi-directional input/output, is that cool? well, not if you add an input buffer. and for dead astro, I reckon you should get this back on your BB if you like depth, it has surely as much as you need. I grabbed 180k for the 220k, and there was plenny depth still. and with the ea trem osc, you'd get the depth control, more osc output and a flashing led, if you wanted.

[Davelectro]

The rate led at Q2C won't work, but it may be placed between +V and the junction of R5 and C2.

[deadastronaut]

have you whacked a humbucker through it?..and hit your guitar hard...i found it distorts. (original schemo)

[Davelectro]

No clipping with PAF-style humbuckers.