[GreenKeys] RS232 to TTY Loop Boards

[Lester Veenstra]

Bob:
  Is there a current part that is a better substitute for the HV opto
isolator, even if a PCB redesign would be required? (single part or
multiple parts)
   Les


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: Bob Camp [mailto:kb8tq at n1k.org] 
Sent: Sunday, February 15, 2015 4:34 PM
To: lester at veenstras.com
Subject: Re: [GreenKeys] RS232 to TTY Loop Boards

Hi

Just a comment on that board:

In the configuration shown, the opto is rated to 250V. There is a drop in
part (the HSR412L) that is rated to 400V. All of
them are listed as “obsolete”. You will be paying scalper prices for them.
Even so I’d go for the 412 rather than the 312. 

With a 125V loop supply, the magnets fly back above 250V to ground pretty
fast. Neon bulb pairs across the magnets light up
pretty well 
.

Bob

> On Feb 15, 2015, at 4:03 PM, Lester Veenstra <Lester at veenstras.com> wrote:
> 
> Before I order some, does anyone have any of these boards available,
> populated or un-populated?
> http://www.aetherltd.com/connecting.html
> 
> Lester B Veenstra  MØYCM K1YCM W8YCM
> lester at veenstras.com
> 
> US Postal Address:
> 5 Shrine Club Drive
> HC84 Box 89C
> Keyser WV 26726
> GPS: 39.336826 N  78.982287 W (Google)
> GPS: 39.33682 N  78.9823741 W (GPSDO)
> 
> 
> Telephones:
> Home:                     +1-304-289-6057
> US cell                    +1-304-790-9192 
> UK cell                    +44-(0)7849-248-749 
> Guam Cell:              +1-671-929-8141
> Jamaica:                 +1-876-456-8898 
>  
> This e-mail and any documents attached hereto contain confidential or
> privileged information. The information is intended to be for use only by
> the individual or entity to whom they are addressed. If you are not the
> intended recipient or the person responsible for delivering the e-mail to
> the intended recipient, be aware that any disclosure, copying,
distribution
> or use of the contents of this e-mail or any documents attached hereto is
> prohibited.
> 
> 
> 
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net
> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of John Nagle
> Sent: Saturday, February 19, 2011 12:14 PM
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] RS232 to TTY Loop
> 
>> From: Wa3frp<wa3frp at aol.com>
>> Subject: [GreenKeys] RS232 to TTY Loop
>> 
>> I was wondering if anyone has a solution for me.
>> I am looking to key my 60 ma teleprinter loop from my laptop using the
> RS-232 interface.
> 
>    Sure.  See
> 
> 	http://www.aetherltd.com/connecting.html
> 
> 						John Nagle
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