Hi Bryan,
Is it possible to provide optoisolator diagram similar to Don’s diagram for
simple transistor interface? Quite a few may be interested in building
isolated circuit. I’ve built the interfaces from Don’s diagram and worked
great, were quick and fast interface solution. Perhaps with little more time
and planning available I’d have built the optoisolators too.
Cheers - Steve W5JK
On Jul 7, 2014, at 12:01 PM, Bryan Swadener via WriteLog
<writelog@contesting.com> wrote:
> Hi Don,
>
> That simple transistor interface offers zero ground loop
> isolation between the PC and the rig. I used a dual
> optoisolator IC to provide isolation before switching to
> a fancy Rigblaster Pro (which uses optoisolators).
> Then, I added a WinKeyer to get away from the
> corrupted Morse problem.
>
> Now that I'm having problems with the DVK function and not
> finding a cure, I've decided to go with a simple homebrew
> passive AF line-level mixer interface using better
> transformers than are used in the RB interface.
> Thanks to Steve N9OH for trying to help.
>
> vy 73,
> Bryan WA7PRC
>
> Date: Sun, 6 Jul 2014 18:12:41 -0500
>> From: "Don Hill AA5AU" <aa5au@bellsouth.net>
>> To: <writelog@contesting.com>
>> Subject: Re: [WriteLog] CW direct keying
>>
>> You can build a simple CW transistor interface. Diagram here:
>>
>> http://aa5au.com/rttyinterface.html
>>
>> 73, Don AA5AU
>>
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