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In Reply to: RE: Grado RA-1 Battery -to- PSU Mod. Issues posted by Caucasian Blackplate on January 11, 2016 at 11:40:56
Yeah, that's kind of how I figured it but that's not what's happening for whatever reason. I've tried 3 different DC units, swapping out one of the pair for another and always get the same result. Short of chopping into them I can only guess that the grounding scheme is at odds with the RA-1.'
On another note, I'm find direct measurement of the DC output of the 3 to be wildly different; 8.6V, 11.5V, 13.5V. Even another 7V unit I have reads 9-10V. Why so much variation? I just assume when the output is listed as 9V it should be fairly close.
I think I'll just have to stick to batteries.
Follow Ups:
No cheap wall warts suck and are almost always unregulated. Usually they'll read 10-11 volts unloaded then they'll drop closer to nine with a load on them.
ET
An unloaded power supply may not be that tightly regulated. Your RA-1 draws so little current that you might be better off with a 7V DC supply that says "Class 2 Transformer" on the case.
The wall warts you tried likely aren't regulated. That means their DC output will vary based on AC voltage at the wall outlet, the impedance and current draw of the device they're powering.
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