Is the center of the power plug positive or negative?
310161
there are no indications on the plug nor the battery but I think it's positive in the center
253031
Plug is not polarized; it can go either direction in the outlet. The plug size is not a problem; I am able to plug other things in the other outlet.
714824
Center-tip-negative polarity is not the norm, easier to buy one here. You'll see one in the "customers...also bought" links--e.g. Planet Waves 9V Power Adapter, which has the polarity you need. Just make sure any adapter you use is "center tip negative".
1068501
by the look of the drawing on the side, 4 goes to the positive on the coil on the SSR and 3 goes to the negative to the coil of the SSR. but I would be surprised if it polarity matters on the Solid State Relay.
1220835
Positive and negative from battery on one side; positive and negative to the 12v motor on the other side. There shd be very small print that illustrates which side is which
1037573
I agree with T. Thomas, sounds like reversed polarity - it's easy to do as the documentation is not very clear on the wiring.
2153853
yes it's true, it has no polarity on both terminals. either ways of connections work properly.
2163702
It took me a minute to understand your question, but I assume you are referring to the center of the 5.5mm x 2.1mm plug. In that case, yes, the 2.1mm diameter center (female) part of the plug is positive. And the 5.5mm diameter outer collar is ground (negative). I don't have that device right in front of me but I measured an identical plug and even took it apart to check. The outside collar actually measures 5.334mm or 0.210-inch diameter according to my micrometer. This is probably too much information. Anyway, hope this helps.
2217467
The red wire connects to the center pin, the black wire to the outer ring. As far as polarity, it depends on what being plugged into it. If you want a pos. center pin connect the pos power lead to red. For a neg. center pin, connect the neg. power lead to the red wire.
1947877
There is NO "positive" and "negative" in house wiring. Please do a web search on "lamp re-wiring". An improperly wired lamp can give you a bad shock (or worse) even with the switch off.
1893457
It will be labeled for polarity under the cover. You will want to get an appliance cord and wire it in. It is a very basic wiring job that only requires a screwdriver, however it is electricity and it is dangerous. Done incorrectly you could damage the motor, your home, cause a fire, or even kill yourself so hire an electrician if you don't think you can do it properly.
1987004
There is a power cord coming out. They are 2 wires. The only hard part is there is no documentation as to positive vs negative lead. I tested both directions and chose which worked best.
1479499
With a standard 12v DC adapter. Look on the PCB and you will see a + and - sign indicating the polarity.
1130167
See Karlberg's comment. Also, both studs are for Positive inputs. There are no Negative (ground) terminals.
659248
Yes. It's center negative just like the pedal. This was one of the quietest adapters I've used.
1943554
Hello. Not sure if this one is call it right angle or not. But I will describe the plug for you. Up are the negative and positive, down the grown cable (round plug) and bellow is the cable it self coming out from a side of the low profile plug. This units plugs really flat and the cable cames out from a side at 90° from the wall plate.
812493
On the side of the unit, it says "7-9 Volt", and a diagram for NEGATIVE CENTER. This is important because most wall adapters are positive-center, and using the wrong one might burn out the machine (unless the circuit designers went the extra mile to protect against that, which I'm not going to try to find out).