tiny tremoloOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

[deadastronaut]

@manny, finally tested the 2 trannies armando sent..in my dmm...

just to let you all know ,they  read,

182 hfe

164  hfe...and both work...hmmmm..

[MetalUpYerEye]

Is anyone making still making PCB's for the Tiny Trem or (now) making PCB's for the ameoba? Sure wouldn't mind having one... 

[deadastronaut]

i'm still tinkering as yet.....

tiny enough to vero really though....but there is still a clicky issue with the 'tiny'

and the 'amoeba' needs to get rid of a bit of crackle only when you play...no ticking at all...thats why im going down this route...


anyone got any ideas on getting rid of the crackle?...looking at the pdf?..ive tried lots of stuff..

its really clean until you put the depth pot on it..then it introduces a crackle when playing only...otherwise great!..

[Jhouse]

I haven't started to try to tackle this project yet. To be honest, the great hunt for just the transistor kind of put me off. Does the circuit only crackle when the depth knob is on and does it do it the entire time it is on?

[Gurner]

Is there a schematic (vs a layout) for the amoeba?

[Jhouse]

HERE you go.

He posted it in an earlier post.

[deadastronaut]

I haven't started to try to tackle this project yet. To be honest, the great hunt for just the transistor kind of put me off. Does the circuit only crackle when the depth knob is on and does it do it the entire time it is on?

yeah know what you mean about hunting for trannies...

re:amoeba.
ive just tried it with the in on one side of ldr....and out on the other side of ldr....perfect..no crackle at all...without any form of depth control....

trems well on my rythm pickup and all other selections (5way)...not so choppy on my treble pickup though...

so the problem/crackle definately lies with the depth!...hmmm..ive tried varying the led brightness.in different ways, .but it ends up controlling the speed too...hmmmm...

so f=== it , im not having a depth......its going to be a 1 pot addition to another pedal.toggled..as an option..

[Jhouse]

ts going to be a 1 pot addition to another pedal.toggled..as an option

0

You could always slap in a spdt switch in place of the depth pot and stick two different resistors on there, like a 10k and a 22k. It might just be a silly little idea, but at least it would be some form of a depth control.

[deadastronaut]

yeah gotcha, i quite like the choppyness of it as is...im gonna use it on my 'pulsewah'...f=== it!..

http://www.diystompboxes.com/smfforum/index.php?topic=88582.0

been working on the 'pulsewah' too long to remember, be nice for guitar and keyboards too.....and also to get out of my head and move on to other mad ideas i have..

basically its a trem, with a morley wah, i just had to wait till i got rid of any trem noises to build the bugger.....

it will eventually be, a trem/wah/volume/ with these selections/ trem with wah/trem with vol/or just wah or just volume or just trem....just for the hell of it.......all in one...

it works by using the morley ldr system but in reverse...the dark opens the wah/volume...instead of an led opening the wah...no treadle at all, just an ldr lying flat on the face of the box with an led facing it horizontally, (right angled led)

to compensate for daylight and darkness...and your foot interrupts the led........just a mad idea, but it works and sounds cool...and best of all pedal board friendly,  normal 1590bb....

[Manny]

That pulsewah certainly looks interesting Rob 
I've ordered a few different 2N2222a's from different places to see if any work.

I noticed the hFE on yours was slightly lower than mine but can't imagine that that would make any difference.

[deadastronaut]

That pulsewah certainly looks interesting Rob  
I've ordered a few different 2N2222a's from different places to see if any work.

I noticed the hFE on yours was slightly lower than mine but can't imagine that that would make any difference.

hi manny, yeah cant wait to get it done n dusted...

i hope you get a good batch...there's got to be some.....................theres just got to be!.................somewhere.!........(in a 1950's sci fi voice)............

i dont know if it would make much difference hfe wise!...shame the ones i bought dont work ...ive seen a few around in places..ebay etc....but those 2 armando had, work definately..... lets see what you get, i
guess..

[guitarmageddon]

hi Rob,
I built this, incorporating your tiny trem idea. (scroll down a bit)
http://www.diystompboxes.com/smfforum/index.php?topic=64752.600

It's a Photon Filter and optical trem, jammed in a 1590A . There's a switchable ldr mounted externaly too

The internal ldrs (one for each effect) look at the back of the pulsing status light.
Its driven by a regular 555- so it does have a little clock noise but still sound cool.

[guitarmageddon]

Heres a demo of my build.
http://www.youtube.com/watch?v=5g4buyZyeUg

[Dragonfly]

deadastronaut - while you were looking at negister setups, did you check out the Negistrem the nordine came up with a while back?  Might give you some ideas....

http://www.diystompboxes.com/smfforum/index.php?topic=66950.0

[Manny]

That Negistrem looks interesting.
Seem to rely on the same weird behaviour from 2n2222 family though.

I'm going to give this a try and see what happens. Any ideas which FET to use, or will any do? (I've got MPF102s and J201's around somewhere I think)

[deadastronaut]

@guitarmaggedon. nice, i love it. ive been doing a similar thing, using the ldr in a reverse action,so when ya foot covers the ldr the wah opens..
using my ' darklight'
http://www.aronnelson.com/gallery/main.php/v/chickpea/DARKLIGHTLDR.jpg.html
instead of light hitting it...which leads to obvious problems in different lighting .....very cool  though i love the sound of that filter...great...
and cramming it into a 1590a...excellent...



@dragonfly, yeah i came across that, on my web wanderings, looks good, i tried it with my dodgy 2n2222a's and a j201 but it didnt work...
i havent tried it with my 2x 2n2222a's that do work as a negistor though!...may have to re board it...thanks man.

btw, point 3 on earthtones list was interesting.....anti popping etc...

@manny, yeah that will be the problem i think, finding the elusive 2n2222a's that will actually work..but it looks like a cool circuit..i think j201's will do it..
i'll have to give it another go i think...

on the negistrem, i would suggest getting the negistor to work (whack an led in there to see or dmm)  before doing the rest of the circuit....

anyone know of an alternative tranny that will behave the same a the 'can' type 2n2222a's, if there is, then problem solved..... rob.


edit: ive been looking at dano's lfo for a while, has anyone tried this lfo, and does it click?.....i havent a 40106 at the moment..
http://www.beavisaudio.com/Projects/ColorsoundWah/index.htm

[Jhouse]

I know of an alternate transistor that would work every time! A uni-junction transistor would work I do believe. 2N2646 is a good example of one.

Honestly though, a 555 cmos chip would be cheaper and easier to come across. This is why they quit using uni-junction transistors I think. I don't know. I'm not old enough for them. Anyway, I think the "ticking" noise that comes from the 555 version of your tremolo has to do with the LDR, kind of like the crackling problem with the amoeba.

Here's a quick schematic I drew up proposing the uni-junction transistor idea. R1 and C1 control the rate and they should be anywhere between 10k (uf) and 50k (uf). R3 is 47 ohms and R2 is 100 ohms. You could still stick a pot on the power supply for a rate knob and I designed that idea around a 2n4871 because I happened to find one, but I'm almost certain a 2N2646 would work.

[deadastronaut]

hi jace, that looks interesting, nice one, have you tried it?...at least its not a 2n2222 eh?..

on the subject of ticking, i tried a 4093 osc earlier..ticked like f...worked well though very stable etc..


anyway on going through lots of different osc i went back to the cmoss 555...guess what, ...yay i got rid of the ticking..finally...

i stuck a 5k trimpot on the 9v going to the 555's 9v and dropped the voltage down..and voil'a no more ticking..

the voltage i have on the trim swings from 1.8v..to 3.3v......no click or tick...even at full volume and gain on my mixer....yay!!!!!!!!..

basically, drop the voltage into the 555 to the lowest v till it just works...even .....try it with a sag pot guys.....much much better....

WHOOOOOOOOO................... [/color][/size]

i'll try it with a proper full size pot...get the right setting then read the resistance and throw a resistor across the 9v to 555...wahhheyyyyy.......report back later..

edit: ok tried it with a 10k pot...it reads 2.7k....so i stuck a 2.2k in there.. i also put a 100uf across the +- for good measure..power smoothing etc....all ok.

[MetalUpYerEye]

'Kay. Now i've got to rebuild my 555 Tiny Trem. 

[deadastronaut]

hi josh, just try the voltage sag first....use a 10k pot ok...i put a 2.2k resistor on the 9v to the 555...sorted...