50 Hz or 60 Hz operation should not really make any difference.

What I cannot understand is why your transformer gets so hot in the 
first place. Is it under rated? What is your load current? What type 
of rectifier are you using (bridge, single diode)? What value is the 
capacitor.

One thing is sure, if you cannot touch it, its too hot and forget 
about any type of certification of your product (if you intend to 
apply for that)

At 23:04 29/11/2006, you wrote:
>I have a mains powered PIC based design that is intended for 
>operation in the US
>but I want to test my prototypes here first. Local supply here in 
>New Zealand is
>230V 50Hz.
>
>I've tried a 230/115V transformer (measured 120V) but my PCB mount 
>transformer
>on my board gets too hot for my liking (85 deg C, or 185 deg F, no 
>load). FYI it is
>too hot to touch for more than a second or two!
>
>I was expecting it to be warmer on 50Hz than 60Hz but not this warm. The
>transformers I'm using are Hammond 183G24, intended for universal operation,
>10VA, dual primary 115/230V, 50/60Hz, sec 2 x 12V. They have 
>insulation rated to
>155 deg C, but should I expect it to run this hot? Surely my 
>measured 120V is not to
>high? I've tried 5 transformers and they alll run about the same temp.
>
>http://www.hammondmfg.com/183.htm
>
>I've checked and double checked that my two primary windings are 
>wired in parallel
>for 115V operation with the correct polarity, the output is also OK 
>and my no load
>test above even had the secondaries completely disconneted. I will 
>wire one up for
>230V operation now and check to see how hot it runs on 50Hz.
>
>Trying to figure out a way of getting a 60Hz supply to test the 
>transformer before I
>complain to the transformer manufacturer. I thought about 12V or 24V to mains
>inverters, but everything available here seems to be fixed 50Hz. 
>Would also need to
>be a sine wave for a proper test, and with 100VA or more I could 
>test my complete
>product.
>
>Ideas? Thanks.
>--
>Brent Brown, Electronic Design Solutions
>16 English Street, St Andrews,
>Hamilton 3200, New Zealand
>Ph: +64 7 849 0069
>Fax: +64 7 849 0071
>Cell: 027 433 4069
>eMail:  brent.brown@clear.net.nz
>
>
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