combined vibe trem

[Kipper4]

Anyone tried something like this? would it work? could it work?
See a problem?
Which do you prefer?

[antonis]

Plz Rich...
Not another phase splitter again..!! 
(they've stalked your slamber..)

P.S.1
Are you sure about bias resistors ratio..??
(thery hardly let for 1V quiescent V_CE..)

P.S.2
If you insist to use Vactrols then use a dual op-amp for phase splitting..

[duck_arse]

I pick option C. disconnect SWING 2 from 3. connect VACT_36 to wiper of SWING. report results.

it's going to drive you mad getting those cap polarities right.

[Kipper4]

[antonis]

it's going to drive you mad getting those cap polarities right.

For Rich's peace of mind (and a really mojo pedal) I'd suggest 2 back-to-back (series reversed) electros of double signle's cap nominal value..

[Kipper4]

I aint no mojo builder just a hacker.

I'm more intrested to see if you guys think it will do something or will just crap out and not bias properly.
Cheers

[antonis]

IMHO, it mainly depends on signal amplitude..

For a "perfectly" biased phase splitter, signals of amplitude slightly lower than 4.5V peak-to-peak shouldn't cause any issue.. 

No comments about Stephen's suggestion..

[Kipper4]

Tried it a couple of ways and it don't worky. The winky wont double wonky my donkey.

Is that a magpie I see.

[Mark Hammer]

Are you trying to make something that can work in either of two ways, or something that attempts to do both at once?

[Kipper4]

Both at once. Parts economy.
I'll add some more nonsense later.
My idea was
1 it's a vibe. (Yay love me a vibe.)
2 it's a shallow tremolo
3 instant rotary effect?
Sadly it's still just a vibe at this point it won't shallow trem.

[ljudsystem]

Looks cool Kipper  There is something very inspiring about the magnavibe/univibe circuit... I keep breadboarding different variations and trying different ideas.

I got two questions:

Couldn't you put the tremolo LDR from the transistor base to ground instead?

I'm not sure I understand what the "swing" pot is supposed to do? Could you explain it to me?

[duck_arse]

I'm not sure I understand what the "swing" pot is supposed to do? Could you explain it to me?

it ain't worth a thing if it ain't got that swing. I rekon it's yer donkey is the wonky. don't they usually have four legs?

[Kipper4]

I got two questions:

Couldn't you put the tremolo LDR from the transistor base to ground instead?

I'm not sure I understand what the "swing" pot is supposed to do? Could you explain it to me?

Q1 yes i guess i could put it at the base or another place.

Q2 the swing pot idea was to make it trem but what the pot does is put more or less resistance before the ldr so I have some control over the amount of swing to Gnd, therefore hopefully have some control over it.
It didnt work out as expected, no surprise there.

[Kipper4]

Even my donkey bray is wonky. DA


Heres a scheme to try to make it a little clearer for you @LJud.

[duck_arse]

what happens to the donkey ifn youse now adds to that un-named circuit in reply #13 the magnaviber ldr from emitter to C25//Rmin junction? or does that become the same circuit we've drawn a dozen times over?

[Kipper4]

Thus

[Digital Larry]

I think this is really a very interesting concept.  A vibe on its own creates a continuous frequency modulation that sweeps up and down between two end points.  An amplitude modulation creates an upper and lower sideband as I remember.  Depending on the relative phase between the two (if they are operating in series), you might get different sounds. 

For example, suppose the amplitude peak corresponds to the middle of the frequency sweep (vibe).  That would probably sound different than some other synchronization.  Looking forward to sound samples!

[duck_arse]

Thus

yeah. like that except for C28 [?] on the emitter. maybe that other 100nF could be bigger, too. did you get any sounds from it?

[Kipper4]

Na no luck like that unless you do this.

Not the best effect ever and i still have to sort out thumper. Hence the note to adjust R1.

Works like this though.




Part of the problem is you dont want the trem to trem when the phase phases or you wont hear anything but thumper. Note led orientation and lagger.

[duck_arse]

hmmm, well, I tried it, I thought there was a couple of settings that werked. it tended to sound just like a pair of thumpy phase shift oscillators flashing leds at ldr's [which it was], one effect or other tended to dominate the overall. I will hack up a drawing for to show my differences to your three legged donkey. or was it an ass?

two oscillators was my design brief from the get gorn. you never mentioned one anti-phase osc, did you?