[TowerTalk] >>Ameritron RCS-4 remote switch

[Jim Lux]

On 4/17/11 3:34 PM, K8RI on TT wrote:
> On 4/16/2011 5:23 PM, Mark n2qt wrote:
>> the MFJ RCS4 needs AC voltage for it to work right.   You can't wire it into
>> the
>> station 12 volt supply and get it to work..  (well you would be able to
>> get two of the 4 specified switched connections, but that would probably
>> leave
> Then how about tapping off the 12V AC.
> There is nothing special about wall warts, except they often make RFI,
> and they charge for them when generally we have a better source handy.
> OTOH there are such things as small battery chargers that need current
> limiting but that is typically done int he charger, and not the wall wart.
The wall wart is probably an essential part of "Class 2" wiring, in that 
it limits the current.  If you tap off the 12VAC from inside some other 
power supply, you might find that an inadvertent short results in more 
excitement than planned.