Seymour Duncan - 805 overdrive

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Seymour Duncan - 805 overdrive

Postby teddeeh » 13 Jan 2018, 11:03

https://i.imgur.com/QHkZAPE.jpg
https://i.imgur.com/6MdBMRy.jpg

Pors and top of circuit
I will post other pictures in a bit.

I cant trace guys. But if someone is willing to help, i will test parts and follow someones guidance in helping trace and sort the schematic to this wonderful pedal out.
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dv8r601 (14 Jan 2018, 05:14), Nocentelli (13 Jan 2018, 14:02)
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Re: Seymour Duncan - 805 overdrive

Postby teddeeh » 13 Jan 2018, 18:55

https://i.imgur.com/A5iul1h.jpg
https://i.imgur.com/becqI3N.jpg
https://i.imgur.com/PmuvQhf.jpg
https://i.imgur.com/XXj9Hzd.jpg

The two caps c11 and c12 are 47uf 25v
No components on the other side. Switch looks simple true bypass board.
Those are the guts. I am planning on shifting this pedal soon. But happy to have a poke if needs be. Im not good at tracing but can test components with my multimeter. And i do have a component tester.

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dv8r601 (14 Jan 2018, 05:15)
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Re: Seymour Duncan - 805 overdrive

Postby roseblood11 » 14 Jan 2018, 11:24

Great!

But please add all pictures as attachements here - there are so many old threads, that are more or less useles, because the external links are dead...

And it would be very helpful if you write a complete list of components, with the writen codes and the corresponding values.
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Re: Seymour Duncan - 805 overdrive

Postby teddeeh » 15 Jan 2018, 05:10

I can try to follow instruction but this is more for someone to help me.. i dont have the time at the moment to really dig in to this. I can help and take direction as im unsure for really digging my teeth into this. And as for tracking a schematic, id be just as much help performing surgery. But!! Im willing to try and help. If i have time ill do a component count and write codes but while i have the pedal as im planning on shifting it, ill do what i can. Ill try and keep it long enough till there is a working schematic and ill test it against the real deal if i can.
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Re: Seymour Duncan - 805 overdrive

Postby teddeeh » 05 Feb 2018, 20:47

Right guys. I kinda fucked the case just a bit so i guess im not selling this now. I have tried to get reqdings from my multimeter but im getting nowhere. I will happily post this to someone, preferably in the uk, to work it out. I will obviously want it back and working but i dont mind sending it to someone to trace and decifer.
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Re: Seymour Duncan - 805 overdrive

Postby wilqen » 05 Aug 2018, 08:56

Hello. I'm in the US, but I'm actually very interested in this pedal and I'm willing to help. You've done the first step, You've taken some great pictures. The pictures show all the components and the circuit stands out on the board nicely.

As far as testing components sometimes that is possible with a resistor while it is in circuit, but not always, however all of the resistors I can see have the codes marked on them. Should be able to figure out what they are. The non-polar caps are going to be difficult because they are not marked at all and it is almost always impossible to measure them while they are in circuit. If some of them have to be removed from the circuit board to measure them it really won't be that difficult since they are surface mount.

Also this circuit is known to be basically a tube screamer and knowing that will help a lot. Give a head start actually. Some of the transistors seem to have non-standard labels, but it's a Tube Screamer, so it shouldn't be too hard to figure out what they are. Sometimes you have to make an educated guess.

I see that your last post is from February. Are you still interested in tracing this pedal? Do you still have it?
You mentioned that the case got damaged. Does the pedal still work?

If we get started on tracing it, perhaps others will join in .....

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Re: Seymour Duncan - 805 overdrive

Postby nomminus » 13 Aug 2018, 09:06

Hi guys, my first time on here and amazingly I am perhaps able to help a little. There is a great resource that I use for identifying resistor values, but not in this case unfortunatly (lol), very simple and extremely effective for the older style through hole jobbies.

https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code-4-band

Now this next bit may just confuse the issue; as I have not studied it against my SD 805. However, the 805 is basically a TS "boutiqued" by SD; so the basics should (I think?!) follow upon these lines:

http://www.geofex.com/article_folders/tstech/tsxtech.htm

Hope you guys find this of some use, I have to try and get involved in some way.


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