3 legged dog question

[paperhouse]

i'm almost done with my very first build but i have a question. the layout shows where the drive pot connects but it doesn't show where the volume pot connects. there's a red circle on the layout that i'm not sure what to do with it - does the red circle go on the gain pot and the other lug goes to ground? or does the volume pot connect in series to the "out" wire and the other lug goes to ground?

i'm referring to this layout btw:



and the red circle i'm referring to is the rightmost pin on the 4049 in the upper row.

thanks for your help! this project has been a lot of fun so far!

[paperhouse]

so according the schematic it looks like i just connect one lug of the volume pot to the "out" wire on the board and the other lug to ground. does anyone know what that red circle is in the pic though? is it just an error?

[zeppelinchld]

the red circle is just an indicator of pin one

[paperhouse]

thanks!

[paperhouse]

ok, i got it all together but i'm just getting noise 

i got the volume pot working but i think i messed up the drive pot. there are only wires for the drive pot in the diagram listed above. should terminals 1 and 2 be connected like in this red llama schem?



that's what i did and all that i get is noise and the noise totally cuts out when the drive is all the way down. i'm thinking now that maybe i should connect the left lug to the red wire, the middle lug to the black wire and the right lug to ground. by "red" and "black" wire, i'm referring to the wires labeled "drive pot" in the diagram above. am i totally off here or does that sound reasonable?

thanks for your help!

[ambulancevoice]

no those two pins shouldnt connect, as you can see on the schematic, pin 1 has "n.c." written next to it, which means no connection
on the board the drive pot should be wired pin 3 to ic pin 7 (the red line on the layout) and pin 2 (wiper) to ic pin 6 (the green line on the layout)
also, dont forget those track cuts!!!


besides, the red llama drive/fuzz pot is in a completly different position on the ic compared to the 3LD

[paperhouse]

thanks for your help - this is my very first build so i kind of expected some trouble.

the tracks are definitely cut out entirely. i'm going to have to buy a DMM to make sure that i read the resistor values correctly.

[StephenGiles]

My 3 legged dog called Bonzo will be pleased!

[ambulancevoice]

bonzo... wonderful

yeah
here is a resistor colour code chart for you to print out so its easier for you to read them

[StephenGiles]

Bonzo is jumping for joy!

[paperhouse]

ok, i cleaned up my traces and fixed the drive pot to no avail. all that i get is a loud noise / buzzing. the really strange thing is that my signal passes through (it sounds filtered) when there's no battery connected but once i connect a battery it dies. maybe i have a bad jfet? i have another 4049 chip that i could pop in there.

oh yeah and i used a few pieces of electrical tape to insulate the leads on that resistor going across the 4049 on the bottom of the board. will that provide sufficient insulation?

thanks again for your help guys!

[ambulancevoice]

did thou directly solder the fet in or did thou use sockets???
check over every component, make sure everything is connected, everything is in the right position (like the ic and electrolytic capacitors)
go over everything!!!
if you cant find it, sleep on it, and check on it the next day, cause the problem might become pretty obvious then

question, are cmos chips static sensitive to?


GO BONZO!

[paperhouse]

i didn't use a socket on the jfet but i did for the 4049. i was pretty gentle on the heat (25w iron) so the jfet shouldn't have fried unless it's very fragile.
i'll look over everything again.

does the fact that it passes signal without a battery but it passes noise when the battery is connected help narrow down the problem at all?

[frankclarke]

A basic chip test is that one pin of each inverter will be at 0V, and the other at the voltage to the supply pin (about 9V). Connected inverters will be 3-4V.
If you remove the 10nF cap, you should get amplified audio output from one of the holes it went into when you play your guitar. Get that working first, then put the cap back in.

[tcio]

I am trying to get help with the 3 Legged Dog also. I am having the same problem. I keep getting this high piercing squeal. I checked all the components, even replaced the transistor and IC in case they were bad and still no success. So I tore it all apart and built it al over again very carefully. I still get the high squealing soind but noticed that if I turn the volume pot down almost all the way it goes away but I then loose a lot of guts. I really love this pedal and sure could use some help. I have to play out in 3 weeks and am hoping to use it.

I am using breadboards........