Don, then all you have to do is hook AUX3 to the controller port, and
generate a common ground between them. Then set the controller to active
LOW - any time you issue the command aux3on, the controller will see 0V.
Anytime you issue the command aux3off, the controller will see +5v. If
you need a pullup resistor to 12V, then add one to the controller side.
On 7/11/2013 2:30 PM, Don Sayler wrote:
> Thanks for the reply, Pres.
> One thing I'm still confused about...where is the 'plus' you refer to
> for controlling the relay? Is that an external voltage source? Of
> course, the ground from that source would have to be tied to the board's
> In a perfect world, I would like to avoid the relay, and put a resistor
> between the external voltage and the output. All I need to do is supply
> 0v or 10v to the COR on the repeater controller.
> On Thu, Jul 11, 2013 at 9:16 AM, Pres Waterman <pp9pp9pp@...
> <mailto:pp9pp9pp@...>> wrote:
> 1a. Re: Outputs
> Posted by: "dsay2001" don.sayler@...
> <mailto:don.sayler%40gmail.com> dsay2001
> Date: Wed Jul 3, 2013 7:33 pm ((PDT))
> Let's try a different question then...
> What is the maximum voltage that can be applied to one of the output
> Don't apply ANY voltage to the output of an AUX port or PTT. When
> that port
> is activated it presents a ground which will flow as much current as
> power source will supply, until the traces on the PCB burn and/or
> the output
> device "parts your hair" in what can be euphemistically be called
> with flame" or "sudden deconstruction" or in other words, releases
> all of
> its "magic smoke" contained within.
> The AUX port is designed to support a (rather small) current flow to
> One good use would be to activate a relay whose coil is connected
> plus and the AUX port (with a diode placed across the coil BACKWARDS
> the "arrow" facing UP schematically to kill a back EMF pulse) so
> that when
> the AUX port is activated, current flows through the relay coil
> "from" plus
> "to" ground via the AUX port. You can then connect other things to
> the relay
> such as lights, coffee pots, electric fences or fog horns.
> Purists will note that current flows from ground "up" to plus, but
> that is
> not the point. I just wanted to squelch the purist who is dying to
> pipe in.