Earthquaker Devices - Talons  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
User avatar
Gila_Crisis
Resistor Ronker
Information
Posts: 404
Joined: 01 Jul 2007, 08:37
Has thanked: 3 times
Been thanked: 124 times
Contact:

Post by Gila_Crisis »

Hi folks,

do anyone here have some information about this pedal?
I tried to google it and I found this gut picture.

it seams not to be an uber-complicated circuit!

thanks for the help
Attachments
eqdtalons5.jpg
eqdtalons5.jpg (44.8 KiB) Viewed 5322 times
Zwischen Ordnung und Chaos fangt die Musik an

User avatar
zedsnotdead
Breadboard Brother
Information
Posts: 125
Joined: 13 Dec 2012, 02:27
Has thanked: 31 times
Been thanked: 54 times

Post by zedsnotdead »

Ok so i got hold of one of these beasts and took several guts photos.

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image


I didn't want to take the pots apart, pedals not mine and the owner didn't want any piece of detailed info of it to be public (hence the blemished date and so...)
Sorry for the crapy photos, but that's all I could shoot at the time.

Hope it helps!

Cheers!

User avatar
ALDOUSCROSS
Information
Posts: 27
Joined: 13 Jun 2009, 03:55
Has thanked: 2 times
Been thanked: 1 time

Post by ALDOUSCROSS »

possibly a Guv'Nor. (just my guess)

User avatar
zedsnotdead
Breadboard Brother
Information
Posts: 125
Joined: 13 Dec 2012, 02:27
Has thanked: 31 times
Been thanked: 54 times

Post by zedsnotdead »

Forgot to mention: Leds are clear red.

User avatar
zedsnotdead
Breadboard Brother
Information
Posts: 125
Joined: 13 Dec 2012, 02:27
Has thanked: 31 times
Been thanked: 54 times

Post by zedsnotdead »

Ah, one other thig. I still have the pedal with me for a week or so. If you need me to check anything just ask and Ill do my best.

Cheers!

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

Do you have a list of the components? Here is what i have so far as a guess.

User avatar
zedsnotdead
Breadboard Brother
Information
Posts: 125
Joined: 13 Dec 2012, 02:27
Has thanked: 31 times
Been thanked: 54 times

Post by zedsnotdead »

I'll try to get some values and post them here.

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

Second guess at values from pictures???

User avatar
zedsnotdead
Breadboard Brother
Information
Posts: 125
Joined: 13 Dec 2012, 02:27
Has thanked: 31 times
Been thanked: 54 times

Post by zedsnotdead »

Just got hold of the pedal. Everything is almost right darmstat, just a couple corrections!

Check it:

Image

My only doubt is that diode, but I guess it's just for polarity protection...?!

Cheers!
Attachments
Earthquaker - Talons components trace
Earthquaker - Talons components trace

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

Great zednotdead. Would you happen to have some pictures of the other side of the pcb board?

User avatar
zedsnotdead
Breadboard Brother
Information
Posts: 125
Joined: 13 Dec 2012, 02:27
Has thanked: 31 times
Been thanked: 54 times

Post by zedsnotdead »

Pictures from my first post are front and back.
I know it's hard to see the tracks, mainly no the backside, but those were the best I could take.... sorry. :|

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

This is what i have so far with the pictures available.

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

with 4.6 k resistor

User avatar
Nocentelli
Tube Twister
Information
Posts: 2222
Joined: 09 Apr 2009, 07:06
Location: Leeds, UK
Has thanked: 1152 times
Been thanked: 954 times

Post by Nocentelli »

Thanks for this! I think the presence control should probably be connected to the inverting input of IC1 instead of the output, and the three tone controls should have their wipers connected to the inverting input of IC2.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

User avatar
zedsnotdead
Breadboard Brother
Information
Posts: 125
Joined: 13 Dec 2012, 02:27
Has thanked: 31 times
Been thanked: 54 times

Post by zedsnotdead »

Just talked to the owner of the pedal, he said I could keep it for a couple of days more :applause:
So, I don't want to take it apart, but I'll try to verify the connections with a multimeter. If it beeps it's ok :P If not... i'll figure it out and correct the schematics (thank you so much darmstat!!!! :thumbsup )

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

So Something like this Nocentelli?

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

OOPS... I uploaded the wrong one. Here is may updated version.

User avatar
Nocentelli
Tube Twister
Information
Posts: 2222
Joined: 09 Apr 2009, 07:06
Location: Leeds, UK
Has thanked: 1152 times
Been thanked: 954 times

Post by Nocentelli »

Yep. And you would normally expect the resistor hanging off the IC1 non-inverting input to be connected to vref rather than ground, and to be smaller in value. I wonder if the 3M3 and cap to ground pair are actually connected to the "guitar side" of the input cap, and there is a different bias resistor somewhere (usually 1M or 470k in this type of circuit) connecting the opamp input to vref? I say all this from the perspective of not having spent hours studying the trace itself, so it is just speculation.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

This my best guess with the pictures and i think i am missing just 2 resistor( 2 x 10k ) which could be somekind of voltages dividers. I am not sure. Please feel free to correct or toss in an oven....lol

User avatar
darmstat
Breadboard Brother
Information
Posts: 109
Joined: 06 Feb 2011, 18:15
Has thanked: 1 time
Been thanked: 54 times

Post by darmstat »

diode is just a protection diode.

Post Reply