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Quick question about M^3 V-

post #1 of 7
1/12/12 at 5:27pm
Thread Starter 

I'm about to plug in my M^3 and do the initial setup but I realized the resistance between V- and my chassis is about 1500ohms. Is this normal? There are no shorts, the PSU is in a separate chassis, and everything is isolated as per the instructions. This just struck me as odd so I thought I'd play it safe and ask first. Logic is telling me they shouldn't be connected at all?

 


Edited by Groundzero - 1/13/12 at 1:33am
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post #2 of 7
1/13/12 at 8:14am

I don't have one handy to double check, but I don't think there should be a connection between V- and ground, can you double check without the opamps installed.

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post #3 of 7
1/13/12 at 9:09am

I agree with FA.

I didn't see anything in the schematic that suggested a connection.

 

Is the 1k5 still there with the external supply disconnected?

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post #4 of 7
1/13/12 at 11:00am
Thread Starter 

Yeah it happens with the PSU disconnected. I tried putting an insulating sheet under the  PCB and it is still there too.

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post #5 of 7
1/13/12 at 11:12am

Is it steady 1.5K or does it change as the meter charges the caps?

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post #6 of 7
1/13/12 at 1:56pm
Thread Starter 

1.5k was it stabilized at. I think I fixed the problem, somehow. I got home from work and started playing with it again. For no reason at all the connection was gone, the meter stopped reading any continuity. I jiggled it, wiggled it, took the PCB out, and put it back in, no continuity. I don't know what was causing it but I can't replicate it now. The setup went flawlessly and I'm listening to the amp right now. Go figure? confused_face_2.gif Thanks for the help though. 


Edited by Groundzero - 1/13/12 at 1:57pm
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post #7 of 7
1/14/12 at 3:44am

Hey MisterX, I was wondering if you still did M^3 builds? Sorry about going off topic in a thread here, but your account info says that your PMs are broken, so... If you're up for a M^3 build, how do you want to contact each other? via email?

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