Messages

Thanks a lot for the suggestions.
actually I didn't build any positive ground yet. just want to plan ahead before facing troubles!!
Dave is right, maybe using a baterrry for this positive grounds might be the easiest solution.
I will check the Road rage as well
thanks guys

Hello everyone!
Im wondering i could use a plug to invert the polarity of the 1spot Dc adapter for pedals with positive ground. i read different threds but didnt really understand the thing.
if its possible to invert with a plug, i could use this pedal together wiht others negative ground using a daisy chain right? i mean, only one of the plugs of the daisy chain would be inverted...
sorry, but thats why im a diode destroyer
cheers guys

Can i use a 78L05 instead of the 2N3904 ?
cheers

Cooooooooooool! you got it!
damn! when i bought the parts the guy told me that was equivalent! BAs"%£$%%rd!
Well, i will change and i hope will be fine.
thanks a lot for your help!!!
cheers

RobA, i have no audio probe (yet).
i've found the GGG tubescreamer IC voltage specs. Im using the tonepad layout but , here we go:

original voltage (from DC adapter=9,35V
Ic pins
1- 4,7 V (4,5V)  5- 4,7 (4,5V)
2- 4,9 V (4,5V)  6- 4,7 (4,5V)
3- 4,7 V (4,5V)  7- 4,7 (4,5V)
4- 0 V  (0V)       8- 9,35 (9 V)
on brackes are the GGG measurements
It seems to me that the IC is ok.
im using 2 transistors 2N3906 (on tonepad should be 2N3904)
my measurements are:
(in brackets are the measurement for the 2N4401)
Q1 e = 1,36V (2,5V)
     b= 8,72V (3V)
     c= 9,35V (9V)
The same values for Q2 were obtained.
it seems that my emmiters are sending less that it should and the base is quite high!
could be only a differnce from the 2N3906 in comparison with the 2N4401 ?
so, any further help
cheers folks!




thanks mate!

I will post some pictures a.s.a.p
I found something that might help you experts to solve the mistery.
I've got a old battery that is sending 6.5V. With this battery everything is working fine.
I decided to check with a new one and guess what? the same problem as i got with the adapter.
it seems that the problem is on the pcb than?
it seems to me that somehow is not accepting more than 7V, anything higher, it starts to crash!!!
maaaaaaan this thing is getting very interesting!!!
any diagnostic?
cheers

Hey RobA,
yes, kind of squeal. and if i put the put the gain on "11"   i get some wierd distortion, but only playing the notes harder! just keep in mind that With batteries everything runs smoothly!!!
any tip in how to kill the bloody Squeal?

Hey mates!
I´ve just bought an 1spot adapter and now im getting 9,3V, what i assume its ok!
But, the problem persists! I decided to build than, in another enclosure, and the same problem as in my iphone Box! a very high frequence hum, i believe a lot of dogs got mad aroung my apartment
What i dont understand is: using the 9V battery, everything works perfectly. I can understand that an unregulated DC adapter can bring noise to the board but not working at all as well?
cheers !

Hi.
Jprizz: im using the negative one!
Govmnt_Lacky: yeah, is tottaly unregulated.
Do you think that this will make this strong Humm? Im still waiting the new PS to solve this mistery!
Damn it. First Build, first mistery! i guess this is one of the reasons this stuff is so adictive!!
cheers guys

Hey.
I would like to build a booster and a Fuzzy face! Do you guys have any suggestions ? I´ve seen a lot of options out there. Just want something that will do the job and is reliable!
thanks

Hey!
Thanks for helping! i got the stupid barrel jack and i changed for the "standard one" (the same described by madbean offboard wiring). My wiring are correct.Tripple check .
I will switch the DC adapter for other one and see how it goes.
thanks again for helping!

Hey Guys.
i've just started to build my first pedal. Well, im building a Test box first.
Im following exactly the offboard wiring from Madbean and i got trouble with the DC jack.
when im using only the batery, everything works fine, i can even wire via the aligator plugs, a pcb and works 100%. When i plug a DC adapter, started a strong Hummmmmmmm! If i remove the adapter, leaving only the battery, everyting perfect!
with the adapter plugged, the true bypass is working fine. if the switch is on, again the strong Hummm!
If i remove the input guitar cable, the hum still there.
The only "wierd" thing that i can find is that the 9V adapter is sending 13V to the pedal.
Is there a correct way of wiring the positive wires to the DC jack or doesnt matter if you where u wire the battery snap (the ground is properly wired, the question is only for the 2 remaining lugs)
thanks a lot for any help
cheers