1176 RevA Rotary Switch Version

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ecaltd

Active member
Joined
Apr 21, 2014
Messages
36
Hi There !

Sorry to bother you but i can't seem to get my head around where to wire the GR SPDT switch. there is a #22 and GND on the main and the meter board. I am baffled by the way the signal flow should go... Main > SW > Meter ??? I see designations in diagrams for a "green" terminal but it doesn't seem to exist on the rotary 1.25....

Enough chattering, hoping to hear from you with what will undoubtedly be a simple explanation...
 
If the RevA rotary boards are the same as the RevD.  You don't even need the switch wired.  The GR switching is done with the meter switch, GRoff, GR and +4VU!

Regards,
Jeff
 
deveng said:
If the RevA rotary boards are the same as the RevD.  You don't even need the switch wired.  The GR switching is done with the meter switch, GRoff, GR and +4VU!

Regards,
Jeff

The RevA boards appear to be different with a +4, +8 and GR setting... I think I've looked everywhere and can't find a schematic or instruction for it...

gb
 
Other than the different values, they look exactly the same:

http://mnats.net/images/rev_a_board_set_v1.2.5.jpg
http://mnats.net/images/1176LN_REV_D.jpg
 
dmnieto said:
Other than the different values, they look exactly the same:

http://mnats.net/images/rev_a_board_set_v1.2.5.jpg
http://mnats.net/images/1176LN_REV_D.jpg
Ahhh, now I'm even more confused...

Rev A & D Rotary  > GR Off, +4 and GR ?

Looking at the A schematic it shows the +4, +8 and GR settings...with R77 not used on rotary. When wiring the "slam mode switch" what are the positions on the rotary ??? Does anyone have a schematic of the rotary boards ?

...impending brain explosion !

gb
 
ecaltd said:
dmnieto said:
Other than the different values, they look exactly the same:

http://mnats.net/images/rev_a_board_set_v1.2.5.jpg
http://mnats.net/images/1176LN_REV_D.jpg
Ahhh, now I'm even more confused...

Rev A & D Rotary  > GR Off, +4 and GR ?

http://mnats.net/1176_slam_mode_rotary.html

The second link is the wiring of the rotary... it is for gyraf's version, but it is similar on the REV A


Looking at the A schematic it shows the +4, +8 and GR settings...with R77 not used on rotary. When wiring the "slam mode switch" what are the positions on the rotary ??? Does anyone have a schematic of the rotary boards ?

...impending brain explosion !

gb
 
ecaltd said:
dmnieto said:
Other than the different values, they look exactly the same:

http://mnats.net/images/rev_a_board_set_v1.2.5.jpg
http://mnats.net/images/1176LN_REV_D.jpg
Ahhh, now I'm even more confused...

Rev A & D Rotary  > GR Off, +4 and GR ?

Looking at the A schematic it shows the +4, +8 and GR settings...with R77 not used on rotary. When wiring the "slam mode switch" what are the positions on the rotary ??? Does anyone have a schematic of the rotary boards ?

...impending brain explosion !

gb


After stepping away and into the fresh air I realized that , yes, I am an idiot and talking about two different things..

What I would like to do is keep the +4,+8 and GR options on the rotary. I'm thinking about shifting the R values by one, adding R77 back in and tying it into the other end of R18. I've used Grayhill sealed rotaries and mounted the boards 90º to fit in the 1U case.

The question is, if I do that can I run the pad 22 & GND signal into the SPDT switch to ground it and bypass GR without killing anything ??

gb
 

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Correct, the switch that disables gain reduction, and the switch that selects between GR, +4, and +8 metering, are two different things.

You'll want the disabling to be on a separate switch. If you buy the attack switch from Hairball, it comes built onto the back of the attack potentiometer. This makes it easy to disable GR, and also when calibrating, when the instructions tell you to connect pad 22 to ground, you just twist all the way counter clockwise until it clicks.
 

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