Subtituting Power Adapter/Supply - Range?

Question

I have a transceiver that requires an adapter with the following specs:

INPUT:  115VAC  60Hz  30W
OUTPUT:  12VAC  1.25A

If I look around the house to find an adapter that might work, which numbers are the most important in terms of accuracy? Which numbers to I have a bit of give for? How much give and which way (higher or lower)?

Please be thorough, I know little to nothing about electricity. I don't want to ruin the transceiver. But I know it's totally possible and don't want to have to purchase one at Radio Shack.

Thanks in advance.

Daniel K · Accepted Answer

The simple answer is to look for another adapter that supplies close to 12VAC (maybe 11-13VAC) and AT LEAST 1.25A (amps).  More amps is OK.  More or less volts is not good.

ravurisivarama · Answer

First of all,  the equipment should be custom built, as majority Indian input standards  are 220 V AC  & 50 Hz  

The transformer will  have two windings - Primary (input) & Secondary (output)

Check  & ask for 

(1) The primary coil (i.e. input coil)  should be wound for 115 volts. (most important) 

(2)  The gauge ( i.e. thinkness of the input primary winding wire) of the primary coil should be selected for 30 Watts or higher  (important)

(3) Specify the output Voltage 12.5  AC (You can assign variation/tolerance to this, either plus  or minus so many volts)
(here also gauge & number of turns of the wire used should be appropriate to supply 12.5 volts)

(4) The gauge (i.e. thickness of the seconday coil wire) should be for 1.25 Amperes or more.

The other aspects such as core   (for 60 Hz operation) and no. of turns are availabe  as per the design & and can be arrived using data available with the manufacturer

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Subtituting Power Adapter/Supply - Range?

2 Answers