ugly face debug... fried i.c's?

[frank05330]

after a tiresome day spent debugging, i finally got the ugly face working... kinda. when plugged in i got noise finally, but the signal keeps completely dying out. took me a long time to figure out it only comes back when i touch the cmos555. i was careful about static when putting in the chip, but if this keeps happening does it mean the ic is broken? anyone?

thanks

[tube man in a kilt]

could you give me a link to the schem or somethign? i cant find it.

[tube man in a kilt]

haha, thats what happens when you search google: ugly face. i need a schem w/o the envelope filter. why didnt someone say something about this in my noisemaker thread? this is perfect!

[petemoore]

haha, thats what happens when you search google: ugly face. i need a schem w/o the envelope filter. why didnt someone say something about this in my noisemaker thread? this is perfect!

>>>Oh Yeah !!!

[tube man in a kilt]

haha, but what about w/o the envelope filter?

[Dan N]

If the sound "comes back" when you touch the chip, maybe it has a bad connection to the socket, or bad solder joint. A dead chip would not come to life when you touch it unless you were, uh, naw, could'nt be?

I killed a timer in mine yesterday and plugged in a non cmos chip. It worked fine although it has not been given a workout.

[frank05330]

thanks dan. you were right the ic is definitely not dead, cos i tried another one and i got the exact same problem.
has anyone got any ideas?
when i touch the chip for a second(on the connectors), the sound comes back and will stay back for two minutes or so without having to keep my finger on the chip. but it keeps cutting out eventually.
could it be a dodgy socket? it couldnt be the soldering could it? i havent come across anything like this before, its as if when i touch the chip it "charges" it for a minute or something.
any help would be greatly appreciated
thanks

[aaronkessman]

maybe you need some tubulator cream for it

http://www.altmann.haan.de/tubeolator/default.htm

nah, gotta be a mechanical problem. I wasnt even careful about static when doing mine, and it works great.

[mlabbee]

LOL!  Oh my, that's about teh funniest thing I've seen/heard since the whole cd "greening" craze.

[Paul Perry (Frostwave)]

Seriously though, sometimes stuff "comes on for a while after being touched" because the biassing is wrong, and touching one of the pins happens to put enough static electricity there to keep it up for a while.
Alwaus consider bias beign tugged around by slowly charging/discharging caps when you have these 'delay' style symptoms.

[frank05330]

thanks paul.
i gotta admit tho i know next to nothing about biasing... how would i fix it?
can you recommend maybe any particular caps to use if i was to replace them, that wouldnt affect the bias?
the schematic is at:
http://www.geocities.com/tpe123/folkurban/fuzz/snippets.html

thanks