|HOME| |DIY FAQ| |GEO FAQ| |Debugging Page| |Links| |Schematics| |Wiki| |Layouts Gallery| |STORE|
|AMPAGE| |GEOFEX| |AMZ|

Welcome, Guest. Please login or register.
Did you miss your activation email?
October 31, 2014, 05:36:45 PM
972742 Posts in 103672 Topics by 33095 Members
Latest Member: Bagman
Home Help Login Register
DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Fuzz and Pos Ground (again) 0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] Go Down Print
Author Topic: Fuzz and Pos Ground (again)  (Read 504 times)
roccster
Posts: 27


Fuzz and Pos Ground (again)
« on: September 17, 2014, 11:36:45 AM »

Hi all,

Im new to this forum, and to the whole DYI stompboxes. I can see why this becomes an addiction.
Im really not good at electronics, but I wanīt to learn. So I started out by ordering a BYOC, and now I am trying to figure out these layouts of pedals.
So I stumbled on Tonefiends Fuzz Face (surprise), and off course this whole thing with the Pos Ground is making me really confused (since I canīt get it to work atm).
I have searched this forum to try and find an answer that I can understand, but I guess im just to stupid. So I made this image, showing how I have wired the PCB to the box. Can a kind soul try and have a look and explain what I am doing wrong?



The issue is that the Bypass is working fine, but when I power it on itīs dead quite. So I suspect some kind of ground issue, since when I meassure the transistors I get pretty strange readings
i.e transistor 1:
E = 8.6V
B = 2V
C = 1.4V

So please have a look at the picture and tell me what Im doing wrong?
I have gone through the DIY article several times, and I just cant find it
(article url: http://tonefiend.com/wp-content/uploads/Fuzz%20Face%20Build_v02.pdf )
Logged
Hemmel
Posts: 504


Marc L


Re: Fuzz and Pos Ground (again)
« Reply #1 on: September 17, 2014, 11:41:27 AM »

EDIT : the picture doesn't show on my PC since my company's proxy blocks it.
« Last Edit: September 17, 2014, 12:08:01 PM by Hemmel » Logged

Doing : Morley Classic Wah , Harmonic Fusion Engine, gaussmarkov's TS-808, Timmy Drive
           Building Bass Amp from scratch
Did : Parts-o-caster, Lovepedal Kalamazoo, DOD250
Repaired : Fender Champion 600, Peavey KB-60
roccster
Posts: 27


Re: Fuzz and Pos Ground (again)
« Reply #2 on: September 17, 2014, 11:47:59 AM »

Can you see it now?
Logged
Hemmel
Posts: 504


Marc L


Re: Fuzz and Pos Ground (again)
« Reply #3 on: September 17, 2014, 11:57:18 AM »

EDIT : the picture doesn't show on my PC since my company's proxy blocks it.
« Last Edit: September 17, 2014, 12:08:09 PM by Hemmel » Logged

Doing : Morley Classic Wah , Harmonic Fusion Engine, gaussmarkov's TS-808, Timmy Drive
           Building Bass Amp from scratch
Did : Parts-o-caster, Lovepedal Kalamazoo, DOD250
Repaired : Fender Champion 600, Peavey KB-60
Kipper4
Posts: 2175

Rich UK


Re: Fuzz and Pos Ground (again)
« Reply #4 on: September 17, 2014, 11:59:30 AM »

Does the battery get hot?
Note that in the pdf the led resistor goes to +9v you have it hooked up to the battery ground (-9v)
you have incorrectly labelled the jack plugs too
input jack top to bottom lugs  Ring. Tip. Sleeve.
Output  jack top to bottom Sleeve. Tip.
Logged

Smoke me a Kipper. I'll be back for breakfast.
roccster
Posts: 27


Re: Fuzz and Pos Ground (again)
« Reply #5 on: September 17, 2014, 01:06:26 PM »

Kipper,

Thanx for your input, but this is what the PDF says:
Solder the -9V (black) wire from the PCB and the -9V
(black) wire from the 9V battery snap to the other end
of the 4.7K resistor. (page 38 lover right pic)

Isn't R the inner lug (ground)
S the outer and T the one in the middle?

Sorry for getting confusing Smiley

Ah now I get the what you meant with the Jacks, yes the mono is marked wrong right? But IRL I have connected the wire to the tip on the Mono Jack.
« Last Edit: September 17, 2014, 01:13:43 PM by roccster » Logged
roccster
Posts: 27


Re: Fuzz and Pos Ground (again)
« Reply #6 on: September 18, 2014, 12:52:58 AM »

Ok, updated the pic of pos. ground wiring:



Also this is the schematic, and according to this the output-jack is grounded, i just wonder to where, since the assemble PDF donīt show the output jack grounded at all?



Last night I disassembled the pedal and mounted it on a breadboard, and the first thing that I notice is just the ground problem. This was not pressent in the box, maybe the box it self grounded the output jack? Well regardless, I had a wire already attached to the ground on the output jack in the breadboard, and as soon as I grounded it (to positive ground) the bypass signal worked and the ground issue was gone. Still no signal through the PCB though.

 
Logged
duck_arse
Posts: 2791



Re: Fuzz and Pos Ground (again)
« Reply #7 on: September 18, 2014, 10:04:44 AM »

as kipper says, yr diagrams show wrong. you need the wire to the right hand socket that is connected to "S" connected instead to "T" as marked it the first dia. the plug tip carries the signal, and it needs to connect to the board output. follow the blue from the board to the switch.

the rhs socket needs an earth wire, connected to the SLEEVE, no other lug but the sleeve. the other end commons with ground somewhere, right on the left hand sockets sleeve, then you know it's right. when the sockets are assembled in a metal box, the metal ferrules/flange (I dunno the correct term for it) of the sleeve, unless they are the isloated types, connect via the case. this is "a" method, but has some tricks and downfalls.

and your led needs to have the flat moulded into its case lead, which indicates K, connecting to the more (-) of your 2 wires going to it. the other side, A, goes to the more (+) wire. one of the two wires has the led resistor in series, it doesn't matter which wire it is.

oh, and I've just noticed, your left hand socket has "T" connected to the battery. T for tip always carries the signal. S for sleeve always connects to ground. R for ring sometimes is used to switch the battery on with inserted plug.
Logged

" ... I am obviously an amateur and I have no idea what I am talking about." - AA
roccster
Posts: 27


Re: Fuzz and Pos Ground (again)
« Reply #8 on: September 18, 2014, 11:34:38 AM »

duck_arse,
Thanx for getting back to me.

Ok, still not getting the drawing right (updated it again), I just looked at the pos not the letters Cheesy

Well I have connected the left Input Jack as follows:
Ring goes to +9V on PCB and middle lug on 3DTP
Sleeve goes to Battery +
Tip goes to top left on 3DTP

And the right Output jack:
Tip to middle right on 3DTP
(no ground here)
I understand this jack needs a ground, not sure where since this is supose to be a Pos Ground wiring.

When it comes to the Led you say i dont follow... What indicates K?

« Last Edit: September 18, 2014, 11:42:11 AM by roccster » Logged
soupbone
Posts: 668


Oklahoma Bred..Scots/Irish Blood


WWW
Re: Fuzz and Pos Ground (again)
« Reply #9 on: September 18, 2014, 05:09:14 PM »

Ok, updated the pic of pos. ground wiring:



Also this is the schematic, and according to this the output-jack is grounded, i just wonder to where, since the assemble PDF donīt show the output jack grounded at all?



Last night I disassembled the pedal and mounted it on a breadboard, and the first thing that I notice is just the ground problem. This was not pressent in the box, maybe the box it self grounded the output jack? Well regardless, I had a wire already attached to the ground on the output jack in the breadboard, and as soon as I grounded it (to positive ground) the bypass signal worked and the ground issue was gone. Still no signal through the PCB though.

 
I'm building a F.F. Clone using Dragonfly's Layout,and The "Roger Mayer Hendrix Mods",both from the layout gallery.I'm using a DpDt Switch instead of a 3pdt.(no led) The part I'm stuck at is the wiring for the d.c. jack that I installed,and the battery snap.Do you have any ideas on how this would be wired?
Logged
duck_arse
Posts: 2791



Re: Fuzz and Pos Ground (again)
« Reply #10 on: September 19, 2014, 09:08:14 AM »

roccster - as the pedal is positive ground, and as the jack sleeves ALWAYS connect to ground, and as you have the battery positive connected to the sleeve, all the positives are grounds (put simply). easiest way is to run a wire from the right hand sockets sleeve to the left hand sockets sleeve, just there where the battery wire connects. it can't POSSIBLY be wrong then.

get your led, and have a real close squint at it. better still, look this diagram I found on the googoo's ....



in your wiring diagrams, the led resistor is connected to the black (-) lead, which is more negative than the red (+) lead (or ground for that matter). therefore, the led lead connected to the resistor in your diagrams, must be the kathode. the k must be more negative than the A for the led to light, but it still doesn't care which side the resistor is, just as long as it is there somewhere.


soup - show us a wiring diagram you're thinking of, and we can then point to the wheres and whys.
Logged

" ... I am obviously an amateur and I have no idea what I am talking about." - AA
soupbone
Posts: 668


Oklahoma Bred..Scots/Irish Blood


WWW
Re: Fuzz and Pos Ground (again)
« Reply #11 on: October 25, 2014, 02:51:27 AM »

roccster - as the pedal is positive ground, and as the jack sleeves ALWAYS connect to ground, and as you have the battery positive connected to the sleeve, all the positives are grounds (put simply). easiest way is to run a wire from the right hand sockets sleeve to the left hand sockets sleeve, just there where the battery wire connects. it can't POSSIBLY be wrong then.

get your led, and have a real close squint at it. better still, look this diagram I found on the googoo's ....



in your wiring diagrams, the led resistor is connected to the black (-) lead, which is more negative than the red (+) lead (or ground for that matter). therefore, the led lead connected to the resistor in your diagrams, must be the kathode. the k must be more negative than the A for the led to light, but it still doesn't care which side the resistor is, just as long as it is there somewhere.


soup - show us a wiring diagram you're thinking of, and we can then point to the wheres and whys.
I'll post the link when I get up!(can't post the link from my stupid windows phone.)
Logged
soupbone
Posts: 668


Oklahoma Bred..Scots/Irish Blood


WWW
Re: Fuzz and Pos Ground (again)
« Reply #12 on: Yesterday at 11:22:21 PM »

roccster - as the pedal is positive ground, and as the jack sleeves ALWAYS connect to ground, and as you have the battery positive connected to the sleeve, all the positives are grounds (put simply). easiest way is to run a wire from the right hand sockets sleeve to the left hand sockets sleeve, just there where the battery wire connects. it can't POSSIBLY be wrong then.

get your led, and have a real close squint at it. better still, look this diagram I found on the googoo's ....



in your wiring diagrams, the led resistor is connected to the black (-) lead, which is more negative than the red (+) lead (or ground for that matter). therefore, the led lead connected to the resistor in your diagrams, must be the kathode. the k must be more negative than the A for the led to light, but it still doesn't care which side the resistor is, just as long as it is there somewhere.


soup - show us a wiring diagram you're thinking of, and we can then point to the wheres and whys.
Sorry it took so long to get back with you.I have A.D.D.(Attention Dave Disorder.lol) So,Here's the layout i'm using; http://www.aronnelson.com/gallery/main.php/v/DRAGONFLY-LAYOUTS_0/album18/album151/DALLAS_ARBITER_FUZZ_FACE_SILICON_PERF.gif.html    and the "Hendrix Mods"; http://www.aronnelson.com/gallery/main.php/v/Richard-Boop-RLBJR65/album84/FFace.gif.html  There's the layouts.I am doing it on perfboard this time.I'm using AC128 Germanium Transistors(PNP Build),a Carling DpDt Switch,and d.c. jack plug like this; https://www.smallbearelec.com/catalog/DCjack.jpg
« Last Edit: Yesterday at 11:29:49 PM by soupbone » Logged
roccster
Posts: 27


Re: Fuzz and Pos Ground (again)
« Reply #13 on: Today at 12:24:06 AM »

Sweet, thanx m8!

I mannaged to get the JB Fuzz Face to work just fine. Just switched the pos and neg from the battery connector. Problem was in the polarity of the trannies. After I sorted them out everything worked ok. Not thrilled with the sound of the JB though, think itīs way to muddy for my taste so my search for a fuzz continues Smiley

Cheers!
Logged
duck_arse
Posts: 2791



Re: Fuzz and Pos Ground (again)
« Reply #14 on: Today at 08:17:36 AM »

wire the dc jack to suit the plug attached to the supply/wall wart/adaptor. so if your supply plug has centre negative, the only way to wire the jack is as shown. you still switch the positive lead, whether positive ground or negative. .... I might be wrong ....



this one, being dragonfly's layout

shows "BC108 or similar PNP silicon" which is 100% incorrect, as the bc108 is an npn type. AND they are shown backwards for the bc5xx, the flats face the other direction if you want the bc series collector to supply. the bc108 comes in a metal can with emitter tab. oh, well. I think the electros are backwards for pos ground as well, but the parts positions might be alright ......

and this one showing the circuit


seems correct (except for the millenium switch line polarity). collect up all your grounds on the pcb and run one wire to the dc jack "to board +" lug, and one wire to the sleeves, cause they are always ground, and one wire from the centre pin back to "-9V". and don't daisy-chain the supply with a neg ground pedal, or you'll short the supply and both pedals stop.

the best thing you can do is draw the whole circuit (NOT the layout, the circuit) and include all the stuff, bypass switch, dc jack, battery, all. when you have the circuit CORRECT, the wiring is a doddle. let the mechanical follow the electrical, not the other way round. I hope this helps.
Logged

" ... I am obviously an amateur and I have no idea what I am talking about." - AA
Pages: [1] Go Up Print 
« previous next »
Jump to: