EMG DG20 (SPC and EXG) schematics etc.

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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby collingtech » 09 Feb 2010, 01:00

..and , is possible to change the ic for une better rated like tlc2262 or another opamp whit better noyse (less) ratio? or tlc2262 is incompatible (fetinput?)thanks
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby DimebuGG » 11 Feb 2010, 04:48

collingtech wrote:..and , is possible to change the ic for une better rated like tlc2262 or another opamp whit better noyse (less) ratio? or tlc2262 is incompatible (fetinput?)thanks


Actually, I used this SMD chip(TLC2262) and the rest are thru-hole components.
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby omni » 11 Feb 2010, 18:14

Bajaman,

I looked over your combo board and compared it to your schematic and found two discrepancies on the board.
1. On pin 9 of the LF444 you have the 1k resistor and the 56nf capacitor locations swapped
2. On pin 14 going thru the 1uf cap you have the resistor going to exg out as 1k.

So do the response charts reflect this? Also on the polarized capacitors are you using tantalum's?
Are you going to do the Afterburner to complete the set?

Thanks
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby bajaman » 11 Feb 2010, 21:55

I looked over your combo board and compared it to your schematic and found two discrepancies on the board.
1. On pin 9 of the LF444 you have the 1k resistor and the 56nf capacitor locations swapped
2. On pin 14 going thru the 1uf cap you have the resistor going to exg out as 1k.

So do the response charts reflect this? Also on the polarized capacitors are you using tantalum's?
Are you going to do the Afterburner to complete the set?


1. it makes absolutely no difference :wink:
2. It is shown as 10k not 1k, but it should be 2k :shock:
3. yes
4. I am not using any capacitors :lol:
5. No :|
cheers
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby collingtech » 12 Feb 2010, 15:43

DimebuGG wrote:
collingtech wrote:..and , is possible to change the ic for une better rated like tlc2262 or another opamp whit better noyse (less) ratio? or tlc2262 is incompatible (fetinput?)thanks


Actually, I used this SMD chip(TLC2262) and the rest are thru-hole components.


any chnce to share your layout ? thanks
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby borislavgajic » 20 Feb 2010, 19:31

SPeter wrote:Thanks a lot bajaman!
Great work!
:applause:
:thumbsup
:D



mee too bajaman...you share a lot with all of us.....thanks man......respect :thumbsup
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby orngjuice » 26 Feb 2010, 23:48

Hallelujah! somebody's traced it. Now does anybody have any info on the EMG SA's. You know, to complete the set.
-OJ
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby bajaman » 27 Feb 2010, 01:00

Now does anybody have any info on the EMG SA's.

You pay for it - I will pull it apart and reverse engineer the preamp in it :wink: :wink:
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby Aharon » 15 Mar 2010, 14:36

Thanks a million Baja,you da man!
This might be the project that brings me back to the hobby.....
My small contribution,somebody asked if the LF444 could be replaced with something else....Burr-Brown OPA4137.
Cheers
Aharon :thumbsup
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby flood » 18 Mar 2010, 08:12

Nothing to contribute here, but I just wanted to write in to tell Steve that he ROCKS way beyond belief. :thumbsup
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby bajaman » 18 Mar 2010, 08:43

aw shucks :oops: :oops: :oops:
I try to please ( and encourage more DIY :wink: :wink: ) :hug:
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby bool » 18 Mar 2010, 22:59

Baja for President!
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby lutor » 19 Mar 2010, 16:51

For first I want to give many thanks to Bajaman (He is for me one Hero) :applause:
For second I want to give you my small work for the person that want to use the perfboard in this project.
Note: Excuse me for my bad English language.
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby lutor » 20 Mar 2010, 10:16

I hope you want to excuse me but the correct layout it is the following one:
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby CHEEZOR » 29 Jul 2010, 05:00

Does anybody have hole through component layouts for all three EMG tone controls (SPC, EXG, and RPC)? I was thinking that it would be fun to build these into a stompbox with bypass switches for each control. Then you could use the EMG tone controls with all of your guitars and keep your standard wiring. I thought it might be cool to radically change your tone for solos. Any thoughts? I am a total newb to pedal building so thats why I haven't just done it on my own, but I thought this would be a cool beginner project for me.
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby UberStrat » 10 Aug 2011, 02:00

I'm trying to combine the tone pots for the spc and exg into a concentric stacked pot, but i cant find a 100k/25k pot. All I can find is either a 100k/100k pot or a 25k/25k pot .

I'm guessing there's some way for me to add a resistor to one of the pots to make a 100/25 combo, but I'm a complete novice and need a hand. Is this possible, or is there some other solution I'm not thinking of?

Thanks!

David
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby RnFR » 10 Aug 2011, 02:50

"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic

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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby KB » 29 Sep 2011, 12:07

UberStrat wrote:I'm guessing there's some way for me to add a resistor to one of the pots to make a 100/25 combo, but I'm a complete novice and need a hand. Is this possible, or is there some other solution I'm not thinking of?


A 33K resistor in parallel with one of the 100K pots will give you approximately a 24k8 pot. Close enough I think for what you want.

Cheers

Kevin
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby gmulak » 17 Jan 2012, 07:08

I'm sorry guys but where is the EXG layout? :!: :!:
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Re: EMG DG20 (SPC and EXG) schematics etc.

Postby Cheese Bag » 25 Apr 2012, 05:38

I second the exg through hole pcb.
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