Thanks Mike, Your a gentleman...Confirmation apprecieated.
Cheers Dave UZN
--- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ
<[EMAIL PROTECTED]> wrote:
>
> At 01:06 PM 01/14/08, you wrote:
> >Hi All, I have a CSI-32 tone panel that will work at 120 volts ac
or 12
> >volts dc. We in the UK only have 240 volts ac and having had a
look at
> >my very blurry electrnic copy of the service manual it looks like
the
> >primary needs to have connections 2 and 3 joined together for 240v
> >operation.
> >Can anyone with a better copy of the cctt confirm this please?
> >
> > Thanks in advance........Cheers Dave G7UZN London
>
> The only schematic I have access to is at
> <http://www.repeater-builder.com/other-mfrs/csi-32.pdf>,
> and in looking at it you are correct. The transformer has
> two primaries which when in parallel are for 120v, and
> in series for 240v.
>
> Note that the USA mains distribution system is based
> on 3-phase power, and the "240" in some situations is
> closer to 208v, and the transformer may have been built
> for 110 / 208-220 vs 120v / 240v . If you have a concern,
> and have access to a variable output transformer,
> sometimes called an autotransformer (a major brand here
> in the colonies is "Variac") you could do a quick test:
>
> Leave the primaries in parallel, and set the auto-transformer
> for 120v and measure the secondary AC voltage.
> Then change the jumpers to series, and set it for 208,
> and measure again, then ramp it up to 240 and see what
> the voltage is. If the 240 value is the same as the 120 value,
> then it's not liable to burn up on you. CSI has been out of
> business for years, you may have a problem getting a
> replacement.
>
> Dave, if the transformer in the CSI gets hot on 240v you
> could get something like this:
> <http://www.allelectronics.com/cgi-bin/item/PS-
12150/480/12V_1.5A_SWITCHING_POWER_SUPPLY_.html>.
> Just cut the plug off and put a local plug on. Note that the input
> is 100-240vAC.
>
> I've got several 12v devices around the house that are running
> on some of the above 12vDC 1.5a switching wall warts.
>
> Mike WA6ILQ
>
