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Dod 250 bypass issue

 
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Johno
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Joined: 20 Apr 2006
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Location: East London

PostPosted: Sat Jul 25, 2020 4:08 pm    Post subject: Dod 250 bypass issue Reply with quote

I love the Dod 250/ Mxr Dist + circuit(s)..... but my Dod does not pass signal when switched off, it's one of the old 3 lug switches, anyone know how to wire it so it passes signal when off?
I have 2 MXR's and one of them also has the 3 lug but passes signal fine.



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NickS
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Joined: 14 Jan 2008
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Location: Nr. Basinggrad, UK

PostPosted: Sat Jul 25, 2020 7:13 pm    Post subject: Reply with quote

I see the bottom left MXR has been made true bypass.. I wonder whether the DoD was converted and converted back wrong. I can't see enough of the wiring to tell you what's wrong though.
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Johno
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PostPosted: Mon Jul 27, 2020 4:20 pm    Post subject: Reply with quote

Cheers Nick, I took some close ups if that helps.


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sunshiner
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PostPosted: Mon Jul 27, 2020 5:37 pm    Post subject: Reply with quote

Unrelated to the questions, but I'm curious how do the germanium diods behave in hot environment? Do they go meh the way germanium transistors tend to go?
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George
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PostPosted: Mon Jul 27, 2020 5:59 pm    Post subject: Reply with quote

I thought only the newer 250 reissues were true bypass. Could be wrong though.
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holyCATS1415
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PostPosted: Tue Jul 28, 2020 5:01 am    Post subject: Reply with quote

The footswitch is probably faulty. If you have a multimeter you could check if it’s good or not.
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NickS
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PostPosted: Wed Jul 29, 2020 10:03 pm    Post subject: Reply with quote

holyCATS1415 wrote:
The footswitch is probably faulty. If you have a multimeter you could check if it’s good or not.
This looks like the answer. The wiring looks correct for the Carling 112-P footswitch, the output jack is connected to the common tag by a purple wire and the A and B are the purple wire from the input jack and the blue wire to the effect PCB that isn't connected to the input jack. Replace the 112-P.
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Johno
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Joined: 20 Apr 2006
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Location: East London

PostPosted: Fri Jul 31, 2020 2:11 pm    Post subject: Reply with quote

NickS wrote:
holyCATS1415 wrote:
The footswitch is probably faulty. If you have a multimeter you could check if it’s good or not.
This looks like the answer. The wiring looks correct for the Carling 112-P footswitch, the output jack is connected to the common tag by a purple wire and the A and B are the purple wire from the input jack and the blue wire to the effect PCB that isn't connected to the input jack. Replace the 112-P.


Thanks guys, off on my hols (lockdown willing) but will order a switch upon my return and report back....
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Mike
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Joined: 20 Apr 2006
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PostPosted: Sat Aug 01, 2020 11:44 am    Post subject: Reply with quote

If you're replacing the switch anyway, I would plump for a DPDT latching footswitch and just make it true bypass so it doesn't roll off your top end when off.
But maybe that's already part of your TONE so you might not wanna screw with that
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