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

Posted: 09 Feb 2010, 00:00
by collingtech
..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

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

Posted: 11 Feb 2010, 03:48
by DimebuGG
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.

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

Posted: 11 Feb 2010, 17:14
by omni
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
Omni

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

Posted: 11 Feb 2010, 20:55
by 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?
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
bajaman

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

Posted: 12 Feb 2010, 14:43
by collingtech
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

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

Posted: 20 Feb 2010, 18:31
by borislavgajic
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

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

Posted: 26 Feb 2010, 22:48
by orngjuice
Hallelujah! somebody's traced it. Now does anybody have any info on the EMG SA's. You know, to complete the set.
-OJ

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

Posted: 27 Feb 2010, 00:00
by bajaman
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:
bajaman

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

Posted: 15 Mar 2010, 13:36
by Aharon
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

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

Posted: 18 Mar 2010, 07:12
by flood
Nothing to contribute here, but I just wanted to write in to tell Steve that he ROCKS way beyond belief. :thumbsup

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

Posted: 18 Mar 2010, 07:43
by bajaman
aw shucks :oops: :oops: :oops:
I try to please ( and encourage more DIY :wink: :wink: ) :hug:
bajaman

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

Posted: 18 Mar 2010, 21:59
by bool
Baja for President!

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

Posted: 19 Mar 2010, 15:51
by lutor
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.

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

Posted: 20 Mar 2010, 09:16
by lutor
I hope you want to excuse me but the correct layout it is the following one:

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

Posted: 29 Jul 2010, 04:00
by CHEEZOR
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.

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

Posted: 10 Aug 2011, 01:00
by UberStrat
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
Houston, Tx

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

Posted: 10 Aug 2011, 01:50
by RnFR

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

Posted: 29 Sep 2011, 11:07
by KB
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

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

Posted: 17 Jan 2012, 06:08
by gmulak
I'm sorry guys but where is the EXG layout? :!: :!:

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

Posted: 25 Apr 2012, 04:38
by Cheese Bag
I second the exg through hole pcb.
Thanks