Ac adaptor symbols?

[RiffRaff 10]

Trying to figure out what these symbols represent?

http://imgbox.com/Q5bIcr4Y

(The 2nd diagram's a bit rubbish! Imagine a rectangle with a rounded base, with an ellipse inside and a broad horizontal bar going across the middle!)

The adaptor's knocking on a bit, and doesn't feature the usual 'straight line with open C enclosing +/- format'.

All I'm trying to do is figure out whether the barrel connector is centre negative or positive...

I've figured out the other symbols on the casing : a house with an arrow pointing in, and a rectangle within a larger rectangle, but I can't seem to find these other two...

Ta for your help...

[Top Cats Hat 10]

The adapter must be knocking on a bit.

 

I've never seen such a symbol. Have you tried putting a meter on it to see which is -ve?

[RiffRaff 10]

No meter handy - that's the problem.

As for age....item bought early 2000's.

I've tried tracking down the actual unit - nothing found.

"Model No. ABN412001. Pri:230V~50Hz  Sec:6V~1200mA"

Boasts a "China Export" symbol, as the joke goes!  

 

[Ghozer 112]

stick an LED on the end for a second , if it lights it's right way  if not, turn it round..

can figure out positive then

 

but the right symbol looks like neg center... 

I would imagine the 'square' with rounded bottom and circle like the DC socket on the device, and the - being the symbol for negative...

Edited December 17, 2018 by Ghozer

[RiffRaff 10]

Hmmm...Now I've upped an actual image, the 2nd symbol takes on a new perspective when enlarged!

http://imgbox.com/55acD3b2

[Resident 1,185]

Try to isolate the symbol in the pic and run a Google image search

 

[mary-m 10]

It doesnt state 6vDC on the output it seems to state AC so

could well be an AC output supply and the rectifier etc is inside

the unit , Cant be sure without metering the plug so just a guess

 

 

      Hope it helps

[Ghozer 112]

I was about to say that,

it's AC > AC

[Top Cats Hat 10]

Yes, it's 230V AC in 6V AC out.

[RiffRaff 10]

Well, found one of 'em... the mysterious 2nd.

It's a "Fail-safe transformer"....

 

"The non-short circuit-proof transformer symbol or the short-circuit-proof transformer symbol can be combined with either an Isolating transformer symbol or with a Safety isolating transformer symbol to produce a composite symbol. In this example, the Short-circuit-proof symbol is used in conjunction with the Safety isolating transformer symbol."

 

Crikey!

[RiffRaff 10]

And now the other!

A "Thermo-relay" or "Thermal-relay".

"The relay / electromagnetic switching devices controls are activated by signals. Most of the time, a small voltage or current is used to switch other voltages or higher currents may be electromechanical or fully electronic type."

So after all that - and answering my own original question! - it doesn't actually tell me the connector polarity anyway!

 

[Top Cats Hat 10]

2 minutes ago, RiffRaff said:

So after all that - and answering my own original question! - it doesn't actually tell me the connector polarity anyway!

 

It has no polarity other than Live and Neutral on the primary side.