Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: thunder-rolling on July 05, 2007, 01:57:58 pm
-
Hi,
I'm looking for some very basic information, here:
I am the lucky owner of two WG19k7906 monitors. I need a isolation transformer for these, but this wasnt included in the sale. Does anyone know a good place to get these in Continental Europe?
Also, as the monitors require 120v and over here the wall socket gives out 230v, I should need a transformer for this too, right? Is there a device that does the two thing in one pass?
Also, since this is the first time I've seen one of these up close:) how do you go about connecting one of the monitors? All I see is a white wire and a black wire...as I said, basic information....
-
I'm not sure if there are step-down isolation transformers. You may need both.
Once you've stepped your voltage down (and isolated it), it doesn't matter how you connect the power going into the monitor.
-
Thank you.
How do these monitors get power in a cab, normally? Straight from the wall socket? Or through the cabinet's power supply?
I'm trying to find a basic steps guide online, but these sort of things are regarded common knowledge, it seems. This may be true, just not for me, unfortunately.
-
Here in the USA our isolation transformers are generally 1:1 ratio since we have 120 VAC wall power and the monitors run on 120VAC.
Bob Roberts has excellent AC cabinet power wiring diagrams on his site.
-
There are some 230V to 120V stepdown transformers. Make sure you get one in which the primary and secondary are different windings. If this is the case, this transformer will function as an isolation transformer!
-
There are some 230V to 120V stepdown transformers. Make sure you get one in which the primary and secondary are different windings. If this is the case, this transformer will function as an isolation transformer!
How do I know if a stepdown transformer has different primary and secondary windings. I always thought all transformers had that ??
-
a transformer provides isolation by the nature of operation.
mutual inductance links each winding via the magnetic field produced by the energized winding...
a 120v to 220 v xformer will work in either direction provided the applied voltage is connected to the correct winding . 220v applied to the 120v winding might let the magic smoke out ;D
remember : a step up in voltage results in a step DOWN in current and step down in voltage resultes in a step up in current .
1:1 isolation is same in/out . (none of these examples considerers conversion loses )
qrz
-
Yeah, I get all that. QRZ could you have a look at this:
http://forum.arcadecontrols.com/index.php?topic=75269.0
-
sry, had missed that one -- ?
the g07 "manual" states :
"apply supply voltage through an isolation transformer with a 1 amp capability"
ok, since power = voltage X current . supply range is 108-132v , using 120v as average gives 120 watts.
thus, 85W would be too small at 120v. might be ok for testing purposes , but not long term usage.
remember : watts is watts - whatever the supply voltage may be .
meaning , the wattage remains the same . but , the current requirements will drop as the applied voltage increases
( same as Voltage down , Amps up )
something rated @ 130W or higher rms would be good .
qrz
-
Would that 1 amp be based on the power-up surge or continious use.
Indeed I could give it a try, it _is_ only for testing it on the bench, not permanent use.