RoboVox

[sirreg]

I just breadboarded this circuit. It works but there is alot of noise (feedback). I'm using a medal box with breadboards velcroed  to the bottom.
I isolated the input and output jacks. Anyone have a suggestion?

TIA

Reg

[Marcos - Munky]

Mine is noisy, but don't have feedback. I don't know what is the problem, but maybe it's a normal thing of the circuit.

[niftydog]

breadboard like this?


Mega-stray-capacitance-from-hell-in-a-hand-basket!

That could be you're problem; coupling signals all over the shop! Much better (but still not ideal) to make it on vero-board (or strip-board as them yanks call it!)

[guitarhacknoise]

nifty: " Mega-stray-capacitance-from-hell-in-a-hand-basket! "
how bad?
is this or could this be part of the reason my circuits have a hard time makin' it to perf/pcb after they have worked on breadboard and vice versa? (noise and or  feedback/squeals)
-matthias

[niftydog]

it's hard to get decent results with the gear I have at my disposal. Fact is, it's there, it's unknown and it might be the source of your problems.

Try spreading the circuit out if you can, use up as much space as you have available. Don't use adjacent rows if you can avoid it.

Breadboard is really bad. Perf and strip board are nowhere near as bad.

Use short leads & shield the circuit well.

[guitarhacknoise]

o.k.
then by your rules i'm o.k. (somewhat)
I usually keep the sections in separate areas, to make it easy to get in there and make adjustments/guesses.
edit:
sections-separate areas!
-funny!
matthias......................

[puretube]

don`t you use "breadboards" attached on a sturdy, grounded metal-sheet?

[guitarhacknoise]

mmmmmm.....................
no.
but it IS painted munsell green........................

it's just a square (really..1'X1'!) of plywood with two crappy/over priced R.S.  bread boards on it, and an alum. "control panel"  for hooking up the ............."controls"
pots and plugs/jacks.....
edit:
I thought that link would show me your b.b. ...............
it was the lady .....................
I will do so...................(the date)..................
-matthias

Sirreg...........I have also tried this lil' jammer.........fun, but I have had more fun with the "thing modulator" different chip...same Idea/sounds?

[sirreg]

I'll have to get a pic of my set up. I figured that in a metal box it would
cut down on the noise. I was real disappointed when I heard all the noise.

Would a 220uF cap acrossed the 9V and ground help any?

GuitarHackNoise Where is the Thing Modulator schematic?

I'm using a CD4016BCN IC. I also tried the CMOS Echo on Mucky site
but didn't get that to work.

Reg

[sirreg]

Here are some pics of the prototyping box I build.







:shock:

[guitarhacknoise]

hey sirreg,
nice proto box!
I like it!
here is the thing modulator:
http://www.geocities.com/tpe123/folkurban/fuzz/thing.gif

It may totally trash your voice..........
I put a "blend" switch in mine to let a variable amount of dry signal thru
pin 2- after the .1uf cap , connect a 50k variable resister and a spst toggle to pin 3
I think you can get the lm567 and the lmc567 from digikey.

[Marcos - Munky]

Hey, I liked your box. Try a cap between 9V and ground, maybe it cuts the noise. Also, check this thread: http://www.diystompboxes.com/sboxforum/viewtopic.php?t=24124&highlight=robovox

[Peter Snowberg]

Nice protobox!

Welcome to the forum too!

I've never built one of those devices but I would suggest the same cap that Marcos just mentioned. Try a bunch of values from small (0.1uF) to large (1000uF) and see if you get any variation in the noise.

[Grocha]

Hi. Can anoyone post a robovox´s soundclip?? i´m very curious about.

thanxs
Gabriel