Analogguru - SDD-preamp

ieatyouforbreakfast · Post by **ieatyouforbreakfast** » 28 Apr 2009, 20:33

Does Dirk's layout fit in a standard zvex/mxr box?

Dirk_Hendrik · Post by **Dirk_Hendrik** » 29 Apr 2009, 07:33

That's wat it was designed for

ryanuk · Post by **ryanuk** » 22 Dec 2009, 12:51

It appears that someone has realised the commercial potential of a boxed version of the SDD3K input/output attenuators. See link.

https://trabantland.wordpress.com/2009/ ... ized-unit/

The schem can be found on the site. Similar to analoguru's work earlier in the thread but this version includes the selectable levels of attentuation.

Also the power supply is +/-15v as in the orignal unit...

All of this is powered by a standard 9V Boss adapter. A DC-to-DC converter increases the voltage to give the op amps the full 30V peak-to-peak.

In the pic on the sit I think I see the dc convertor (bloack block between the rotary switches) however, there are also some 3 pin ICs - regulators?

Can anyone take a stab a schematic or provide some thoughts on the power supply?

Whoismarykelly · Post by **Whoismarykelly** » 30 Jun 2010, 20:27

Im working on a vero for this project and after building this up its dead in the water. No signal past pin 3 of the first IC but I double checked it against the schematic AG posted and everything seems correct. But now that I look at Dirk's schematic there seem to be a lot more connections on that first IC. I cant compare to his PCB layout though because there isn't enough labeling to see what goes where. Can anyone please take a look at this vero and give some insight into my noobness?

EDIT — It has occurred to me that there are no 9V connections for that first IC but there are none shown on the schematic. The Vbias produced by the 4558 is just a reference ground right? Its not supposed to be the actual power supply for the circuit right?

tictac · Post by **tictac** » 30 Jun 2010, 21:37

You say there's a schematic?

Looked all over but couldn't find...

Do you remember where you saw it?

Whoismarykelly · Post by **Whoismarykelly** » 30 Jun 2010, 21:42

Figured it out with a lil help. Both ICs need ground and power connections. The schem is at the beginning of this thread.

daz · Post by **daz** » 23 Aug 2010, 15:50

Anyone built this yet? Interested to hear your opinions of it.

lordkalidor80 · Post by **lordkalidor80** » 01 Sep 2010, 08:06

Hi!
I'm interested to reproduce the SDD preamp, like the SDD-3KP... anyone know how to add the two attenuator controllers/knobs in the Analogguru schematic?
Thanks!

devastator · Post by **devastator** » 02 Dec 2010, 20:12

good question, actually , I'm little confuse about that (a guy asked me a SDD preamp). What will be the role of attenuator pot if you just keep the "preamp" section ?

I assume the attenuation is present to avoid clipping of the delay chips (when you plug an instrument with a high level output) , but there're any other reasons to keep it on a booster . You don't reduce the level to increase it after . Someone can say if I'm right or not ?

daz · Post by **daz** » 13 Dec 2010, 22:06

Just built one based on dirk's layout. I couldn't get it working- will have to debug when I get a chance.

So Dirk's layout is verified as working?

tornadoman · Post by **tornadoman** » 24 Dec 2010, 02:04

Hello guys I think it would be easier for me to find these parts if I had a parts list. If anyone wouldn't mind I surely would appreciate the list. Thanks

marketta · Post by **marketta** » 22 Mar 2011, 09:34

ryanuk wrote:It appears that someone has realised the commercial potential of a boxed version of the SDD3K input/output attenuators. See link.

https://trabantland.wordpress.com/2009/ ... ized-unit/

The schem can be found on the site. Similar to analoguru's work earlier in the thread but this version includes the selectable levels of attentuation.

Also the power supply is +/-15v as in the orignal unit...
All of this is powered by a standard 9V Boss adapter. A DC-to-DC converter increases the voltage to give the op amps the full 30V peak-to-peak.
In the pic on the sit I think I see the dc convertor (bloack block between the rotary switches) however, there are also some 3 pin ICs - regulators?

Can anyone take a stab a schematic or provide some thoughts on the power supply?

hi
I have asked an information in private and I apologize me to Dirk I concern the implementation of the 2 attenuatoris but it didn't have time to answer,
Kindly I ask then to the friends of the forum: has someone made this implementation of the two attenuatoris as the original pedal that is on sale on the site Trabantland?
Can you post a PDF?
Thanks

marketta · Post by **marketta** » 22 Mar 2011, 09:39

hi
I have asked an information in private and I apologize me to Dirk I concern the implementation of the 2 attenuatoris but it didn't have time to answer,
Kindly I ask then to the friends of the forum: has someone made this implementation of the two attenuatoris as the original pedal that is on sale on the site Trabantland?
Can you post a PDF?
Thanks

Dirk_Hendrik · Post by **Dirk_Hendrik** » 22 Mar 2011, 17:23

No need to apoligize at all. Your question was targetted at the SDD3k circuit AG came up with and for which I made a PCB layout. Adding the in and out attennuators like in the original SDD3k case is doable but is better off as a topic than as a PM conversation. This way others can benefit from it too

marketta · Post by **marketta** » 26 Mar 2011, 13:07

HI DIRK
I wanted some precise statements respect the project:

1) which taken jack J1/J2 I have to use? mono or stereo?

2) I have noticed an error respect the pins common of the button 3PDT (on the electric scheme they are 1-4-7, are the 3PDT contacts on the datasheet 2-5-8 instead, is it what I say? )

3) I send you photo to see what I have drawn.

make to know me

a regard
Mario

Dirk_Hendrik · Post by **Dirk_Hendrik** » 26 Mar 2011, 13:43

And I replied to that email yesterday by email.
Standard stereo jecks.
The bypass switching is correct. I've built this project multiple times without a problem.

marketta · Post by **marketta** » 26 Mar 2011, 14:32

to resolve the error of the block of the effect, when the P1 is to zero and the effect doesn't increase anymore, I have resolved modifying the partitoris R1-R2; R4-R6 of entry U1/A U1/B
This way doing increases otherwise the profit it is had to put at the most the profit of the ampifier.
To add the 2 attenuatorses for the time being I don't perform her, for now it is all right this way.
Made to feel Dirk

Dirk_Hendrik · Post by **Dirk_Hendrik** » 26 Mar 2011, 18:30

Marketta,

Please get help translating your posts from Italian to English. The thing that comes out of your translation application doesn't make any sense

marketta · Post by **marketta** » 26 Mar 2011, 19:00

I am sorry of my poor man English but I use the translator Power TRASLATOR 7 I cannot do other.
I have put some different partitors to increase the gain

Duckman · Post by **Duckman** » 28 Mar 2011, 23:23

Dirk, tell me something: this proyect can be done using a TL074? Any disadvantage? Just guessing...

Analogguru - SDD-preamp [documentation]