We use cookies to provide you with a better experience. If you continue to use this site, we'll assume you're happy with this. Alternatively, click here to find out how to manage these cookies

hide cookie message
Contact Forum Editor

Send an email to our Forum Editor:


PLEASE NOTE: Your name is used only to let the Forum Editor know who sent the message. Both your name and email address will not be used for any other purpose.

Tech Helproom


It's free to register, to post a question or to start / join a discussion


 

Mains Power Multi Voltage, Adapter 'plus or Minus' Quandry?


Graphicool1
Resolved

Likes # 0

Hi this is a non PC question. I have a 'Mains Power Transformer'.

It's settings are...

Input: 220-240v AC 50Hz

Output: 3v / 4.5v / 6v / 7.5v / 9v / 12v

DC 300mA

It has 5 different connectors, for different appliances.

Plus - and hereby lies my dilemma - 2 sliders. Other than one slider being a shade longer than the other, they are both the same. Each has a 'Minus' at one end and a 'Plus' at the other. I can use either slider, but whichever one I choose means I can't use the other? This is not my field of expertise and I don't want to make a possible costly mistake.

So, my question is: Do I use the long or short slider and where do I position the sliding marker. I can have it on a Minus or Plus, or postion it anywhere between.

Like this post
Nontek

Likes # 0

Meant to add, that in some cases 'it' would just not work, or if correct, that it would work.

Like this post
Graphicool1

Likes # 0

"The item 'Hardware' in question is a 'TASCAM Mini Studio PORTA 03mkII' or in other words a music/sound mixing studio."

Like this post
Nontek

Likes # 0

Normal Polarity markings ....

C---- + with a . in middle of C and unbroken line extending to + sign, means Positive.

  • ----C - sign with unbroken line extending to outer edge of C, means Negative.
Like this post
Nontek

Likes # 0

That item is most likely Positive (+) to Inner pin. It would not work if connected the wrong way round, but I don't think any damage would occur.

Like this post
Graphicool1

Likes # 0

I set it to 12v and '+' the power light on the plug came on. However the power light on the mixer didn't. Although when I switch the play button, one of the spools turns, but not the other. I'll try changing the polarity to '-', if that doesn't work I'll try it down the middle.

Like this post
Nontek

Likes # 0

The power light on the adapter will illuminate regardless of polarity, even when the unit is not connected.

Is it working now?

Like this post
Graphicool1

Likes # 0

OK I changed the polarity to '-' and Whoo, it works. Thanx for your instructions Nontek. However, if your non-tech - as far as mains power goes - I must be neanderthal.

Thanx again to everyone who contributed.

Like this post
Nontek

Likes # 0

Great, glad it is ok now.

Like this post  

Reply to this topic

This thread has been locked.



IDG UK Sites

Best January sales 2015 UK tech deals LIVE: Best New Year bargains and savings on phones, tablets,...

IDG UK Sites

Chromebooks: ready for the prime time (but not for everybody)

IDG UK Sites

Hands-on with Sony's latest smartglasses

IDG UK Sites

Apple TV expert tips: get US Apple TV content, watch Google Play, use multiple Apple IDs and more