[WriteLog] CW direct keying

[Steven Kline]

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 at 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 at bellsouth.net>
>> To: <writelog at 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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