Timeline for Why a 1 A pedal power supply can't power a 750 mA practice amplifier?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Feb 18, 2021 at 13:16 | comment | added | Laurence | The (very expensive) Sony Walkman Professional cassette recorder could be completely fried by the wrong polarity power adapter. I know :-( | |
| Feb 17, 2021 at 8:10 | history | edited | Tim | CC BY-SA 4.0 |
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| Feb 11, 2021 at 9:30 | history | edited | Tim | CC BY-SA 4.0 |
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| Feb 11, 2021 at 9:06 | comment | added | Tim | Years ago, I fixed a double socket into the back of the amp I was using (Peavey Renown), and used two psus. One of each 'sex'. They were hard-wired into a 4-way XLR socket. I then used a matching plug to my pedalboard, on a long (4-way) wire. Plugging in for gigs was easy, and from memory, in the snake were the audio leads too, so everything was either front of stage (pedals) or back (amp/speakers), and it worked well. Quick setup/breakdown. And, no, there was no noise interference, as it happened. | |
| Feb 11, 2021 at 8:56 | comment | added | damix911 | It's amazing I haven't fried everything, btw. | |
| Feb 11, 2021 at 8:46 | comment | added | damix911 | > Watch the polarities That was it Tim! I did check them once with a multimeter but I must have gotten confused that time, because I don't remember seeing a minus sign on the display and everything looked okay. Maybe I was tired :-P. After reading your answer I tried again today and it's exactly as @luser droog said, the 2 A adapter, that happens to work with the amp, is center-positive. The smaller adapter that works with the fx (and was correctly recommended by Amazon) is center-negative. I'll try to find/make some sort of polarity reverser. I'll let you know how it goes. Thank you guys! | |
| Feb 11, 2021 at 8:41 | vote | accept | damix911 | ||
| Feb 11, 2021 at 8:18 | comment | added | Tim | @luserdroog - never understood why there can't be an 'industry standard' for polarity. It used to be a pain for me, and I ended up fixing two wall warts inside my amp, (in sockets) with a 4 pin XLR socket/plug to my (mixed) pedalboard. Quick set-up/breakdown. | |
| Feb 11, 2021 at 8:13 | comment | added | luser droog | Good point about polarities. The pedals are likely to be center-negative, but the amp is likely to want center-positive. | |
| Feb 11, 2021 at 8:07 | history | answered | Tim | CC BY-SA 4.0 |