Hi All

I recently moved to the US and have brought with me a SEC 1223 Switch
Mode Power Supply (spec is below). It is not marked up that it can run
using 120V but i tried it and it seems to be putting out about 13.2V
on my meter. I have not stress tested it with a radio connected on
transmit.

Any thoughts?

Regards

Andy

SEC-1223 SEC 23A 13.8V Switch Mode Power Supply
* Input 230V AC * Output 13.8V DC * Output current 23A continuous (25A
peak) * Thermostatic Fan cooled * HF & VHF filtering *

The SEC-1223 switch mode power supply offers 23A of continuous current
output and 25A peak. This is more than enough for any 100W
transceiver. Designed with RF operation in mind, it is totally noise
free and utterly stable. Lighter than an IC-706 and bout the same
size, it will fit underneath for desktop operation. It will also fit
in a brief case or flight bag.

There is a rack mount version that is internally selectable 120/220 Here's
a thread on the conversion:

http://n2.nabble.com/Samlex-SEC-1223-td382856.html- Hide quoted text -

- Show quoted text -

Hi

Thanks for the advice. I would probably need to find a service
engineer to do this as meddling with the inner of switch mode power
supplies is beyond my comfort zone. I just wondered why it seemed to
work and if i could get away without further mods or if there was a
simple switch to flick like there was on my home pc power supply (if
only!).

Thanks for the link to advice.

Andy


Full schematic he
http://www.n0ss.net/index_general.html

If you had a 120/240 switch, that is where it would go. It cuts off half of
the full wave bridge to feed same voltage that would be available with 240
v.
Doing so will likely allow you to pull full current before regulation goes
south. Might be iffy for your radio if you don't. Also the supply will run
cooler if you do.

There is also an output voltage adjustment.

It has been stated elsewhere in documentation not to hook a battery on the
output for backup.