Boss - PD-1 Distortion Rocker  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

I actually traced mine out and drew up a schematic a long time ago. If I can find it, I'll make a digital version and post it. It's on a piece of paper somewhere I can hopefully find!!
I never did fix mine. I'll have to find it and give it another try. I couldn't get any voltage out of the power section and I think the DC-DC converter is dead. If I find mine, I'll try to remember to take some pictures.

User avatar
pinkjimiphoton
Transistor Tuner
Information
Posts: 1242
Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks
Location: new world order land (formerly la-la land)
Has thanked: 358 times
Been thanked: 479 times
Contact:

Post by pinkjimiphoton »

hey bro,
mine is the same... i took a chance and replaced all the burned up shit, no dice...that 10v thing...the black box..gets hot, and it smokes whatever transistor i try. ;)

but... i DO have a WORKING one, and tomorrow if i get a chance, i'm gonna figure out how to bypass that crap and just make it run off the power jack. i'm hoping the rest of the circuit didn't smoke...lol. but if i'm right, and lucky, should be able to just bypass that junk and go right to the pcb wherever it is that the b+ enters from the blown board. :scratch:

screw "c" batteries... i mean...why go thru the hassle of stocking them for one pedal? especially when you'll probably run it with a freekin' wall wart anyways.. :mrgreen:

that said, if it works, cool, maybe together we can figure out how to make it all work again. it's a great sounding distortion once ya get used to it a little. i can take pics/voltages etc off the good one, so let me know if ya need any readings or whatever. ;)
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

There are three voltages needed: 10v, 9.5v and 5v.
I've been trying to figure out the best way to do this for a long time using a 9v power adapter.
Use a charge pump to "double" voltage and regulate it down to 10v and 9.5v then use a 5v regulator off 9v? 10 and 9.5 are so close I'm wondering if they could both be combined at 10v?

User avatar
roseblood11
Tube Twister
Information
Posts: 1886
Joined: 23 Aug 2008, 14:21
Has thanked: 366 times
Been thanked: 313 times

Post by roseblood11 »

Can you describe how the treadle works? I think that's the most interesting thing in this pedal. I read somewhere that it works magnetic, without any moving parts?

I'm quite sure that you don't need all those different voltages, but a view at the schematic would answer that question...

From the soundclips I'd guess that the distortion circuit itself is quite close to the DS-1.

User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

It is a DS-1 or at least really, really close as far as I can remember. I used the DS-1 schematic to trace most of it.
It uses a hall element to detect treadle movement. I'm not too familiar with how the hall element works. I think they are magnetic in some way. I think this part works of the 5v and 10v.
I think only the input and output buffer transistors use 9.5v.
This is all just guessing based applying what I think the original voltages were at the output of the power section.
It has a power board with the DC-DC converter on it but that board goes to another little circuit that I think is regulating the voltages from 10v to 9.5v and 5v.
I'll look for my drawn schematic tomorrow, scan it, and post it. That is if I can find it.

User avatar
pinkjimiphoton
Transistor Tuner
Information
Posts: 1242
Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks
Location: new world order land (formerly la-la land)
Has thanked: 358 times
Been thanked: 479 times
Contact:

Post by pinkjimiphoton »

hmmmm....let me see what's in there. gimme a little bit to probe (that sounds so dirty) around the working one.

i'm imagining a volt ain't gonna matter.. unless it needs AC somewhere, cuz that black thing i think is some kinda transformer or something.

i'm thinking charge pump and then 2 or 3 regulators, or even a couple diodes/resistor kinda voltage dividers or something.

wish i had a better camera so i could take some pictures that could be useful.
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

Well, I think in all reality we only need to apply 10v and there is a little circuit that regulates it down to 9.5 and 5v.
I'm going to look for the schematic in a little when it warms up. I think it's out in the workshop.

User avatar
pinkjimiphoton
Transistor Tuner
Information
Posts: 1242
Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks
Location: new world order land (formerly la-la land)
Has thanked: 358 times
Been thanked: 479 times
Contact:

Post by pinkjimiphoton »

heck, why not just run it at 9v? seems like a volt shouldn't make much difference, no?
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

Good news!!! I found it!!!
Here you guys go. I'm 99.9% certain everything is correct. Especially the power section. I really took my time to get this one right the first time. That being said, I'm only human. There may be some mistakes.
Attachments
PD-1 Power Section
PD-1 Power Section
PD-1 Main Circuit
PD-1 Main Circuit

User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

Why can't I edit???

I forgot to mention that the voltages were measured with 10v applied which gave me the 9.5v and 5v references. They may not be right. I got that it was 10v from someone else so I was working off that. Someone with a working one might verify the voltages.

User avatar
pinkjimiphoton
Transistor Tuner
Information
Posts: 1242
Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks
Location: new world order land (formerly la-la land)
Has thanked: 358 times
Been thanked: 479 times
Contact:

Post by pinkjimiphoton »

i have a working unit. it takes 9v at the power jack, or runs at 3v on two "c" batteries. that gizmo in there steps it up.

let me get some voltages, be back shortly..
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

Nice. Where I have the voltages posted on the power supply schematic would be ideal places to get voltages.
Also before and after the converter would be good also I guess.

User avatar
Fender3D
Cap Cooler
Information
Posts: 573
Joined: 08 Aug 2009, 02:40
Location: Helltaly
Has thanked: 121 times
Been thanked: 153 times

Post by Fender3D »

It has a charge pump rated at 10V stock.
I modded mine with a 7809 + sil. diode to obtain 9.6V 'cause it wouldn't work with just 9V...

User avatar
pinkjimiphoton
Transistor Tuner
Information
Posts: 1242
Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks
Location: new world order land (formerly la-la land)
Has thanked: 358 times
Been thanked: 479 times
Contact:

Post by pinkjimiphoton »

fender3d on diy posted this:

"Mine has a 2SA1015 then its central pin is Collector

BTW
get rid of that DC-DC **it...
Get a 7810 or a 7809 + sil. diode on GND pin and use a 12V DC adaptor..."
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

User avatar
pinkjimiphoton
Transistor Tuner
Information
Posts: 1242
Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks
Location: new world order land (formerly la-la land)
Has thanked: 358 times
Been thanked: 479 times
Contact:

Post by pinkjimiphoton »

guys, federico on the other forum posted a repair, workaround, and schematic for the blown board....here's a link!!

https://www.diystompboxes.com/smfforum/ ... 59.new#new

Image

"Electros 100 to 470uF 25V, films 100nF
Diodes 4007 or similar.
Unwire the battery box and put it away, unscrew and unwire the stock DC-DC board:
RED wire from DC jack goes to RED on my schem.
BLUE wire from DC jack and Black from main PCB go to my schem. GND
ORANGE wire from PCB goes to ORANGE in my schem.
get rid of the other wires going to DC-DC board.
You should be done..."

thanks to Fender3d!!! ;)
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

User avatar
Fender3D
Cap Cooler
Information
Posts: 573
Joined: 08 Aug 2009, 02:40
Location: Helltaly
Has thanked: 121 times
Been thanked: 153 times

Post by Fender3D »

lol jimi,
multitasking threads here and there...
I should have said "mine HAD..."
but since I kept the stock DC-DC board (you know, those vintage pedals will become collectable sooner or later) I can say "mine has..." as well

BTW
look over there for mod schematic

User avatar
Fender3D
Cap Cooler
Information
Posts: 573
Joined: 08 Aug 2009, 02:40
Location: Helltaly
Has thanked: 121 times
Been thanked: 153 times

Post by Fender3D »

5 minutes...
you won... :blackeye

User avatar
Fender3D
Cap Cooler
Information
Posts: 573
Joined: 08 Aug 2009, 02:40
Location: Helltaly
Has thanked: 121 times
Been thanked: 153 times

Post by Fender3D »

On a side note:
I suggest this mod if you wanna use a single power supply for your pedals expecially if you have 2 Boss rockers (yes, I got the Wha also...),
otherwise those DC-DC boards will hum like hell...

User avatar
pinkjimiphoton
Transistor Tuner
Information
Posts: 1242
Joined: 12 Sep 2010, 19:03
my favorite amplifier: my own, a redesigned princeton
Completed builds: so fucking many goddamn pedals it would make your ass hurt just looking at 'em all!!!!!
there's videos that totally suck of about 90 of 'em here:
http://youtube.com/666pinkster
gimme a like: http://facebook.com/pinkjimiphotonrocks
Location: new world order land (formerly la-la land)
Has thanked: 358 times
Been thanked: 479 times
Contact:

Post by pinkjimiphoton »

lol...thanks federico,
i was so excited when i saw your fix, i had to post...sorry, should have asked permission first!!

now i have TWO of these...maybe i'll mod one and keep it, and sell the original one down the road!!

thanks again bro! ;)
"When the power of love overcomes the love of power the world will know peace."
Slava Ukraini!

User avatar
Bside2234
Resistor Ronker
Information
Posts: 260
Joined: 30 Jul 2007, 19:35
Location: Kennewick, WA
Has thanked: 10 times
Been thanked: 89 times

Post by Bside2234 »

pinkjimiphoton wrote:guys, federico on the other forum posted a repair, workaround, and schematic for the blown board....here's a link!!

https://www.diystompboxes.com/smfforum/ ... 59.new#new

Image

"Electros 100 to 470uF 25V, films 100nF
Diodes 4007 or similar.
Unwire the battery box and put it away, unscrew and unwire the stock DC-DC board:
RED wire from DC jack goes to RED on my schem.
BLUE wire from DC jack and Black from main PCB go to my schem. GND
ORANGE wire from PCB goes to ORANGE in my schem.
get rid of the other wires going to DC-DC board.
You should be done..."

thanks to Fender3d!!! ;)
So this allows you to use a standard 9vDC supply?

Post Reply