- Hi John LTV-817 are nice. Merry Christmas and Happy Holidays to everryone! Larry W9AMR In a message dated 12/24/2011 9:37:33 A.M. Eastern Standard Time,Message 1 of 5 , Dec 24, 2011View Source
Hi JohnLTV-817 are nice. Merry Christmas and Happy Holidays to everryone!Larry W9AMRIn a message dated 12/24/2011 9:37:33 A.M. Eastern Standard Time, KE5SSH@... writes:
Just following up on this...holidays keep getting in the way of shack time...
What model/brand of opto do you prefer?
John - ke5ssh
On 12/9/2011 10:39 AM, Derek-AB3MG wrote:
I am not Larry but I have used internal Ensemble voltages to drive the
switches for an external 10W amp.
I have taken the switched 12 volts (S12v) from the top bend of R35 to
drive a relay coil. I simultaneously used the /PTT line from the bottom
of R34 (board underside) to pull an external, very low current PTT to
Although I have since moved to an optoisolator circuit, my original S12v
and /PTT configuration (on a single power supply) worked just fine.
-------- Original Message --------
From: John Williams <KE5SSH@...>
Date: 12/09/2011 09:43:59 AM
Subject: [softrock40] Question for Larry (W9AMR)
Do you have a circuit for taking PTT off of an RXTX Ensemble and driving
a relay to mute audio during xmit? I seem to recall you posting one but
cannot find it with a search. I want to extend this to both mute the
audio as well as drive the PTT on my 50W amp that is almost complete...
-- John Williams KE5SSH - ham since 2007 WQKA523 - GMRS for family use on the farm