[GreenKeys] 60 ma current loop to RS232 converter

[Pete Lancashire]

Delete Black Box 2N3904's

On Sat, Feb 24, 2018 at 7:56 PM, Pete Lancashire <pete at petelancashire.com>
wrote:

> True .. I only got them for the 33 and 35's
>
> I'll take a look inside one of them
>
> -pete .. where did i put the Sawzall
>
> On Sat, Feb 24, 2018 at 7:38 PM, Jim Haynes <jhhaynes at earthlink.net>
> wrote:
>
>> On Sat, 24 Feb 2018, Pete Lancashire wrote:
>>
>> From time to time on Ebay you can find Black Box 323/CL-E boxes at quite
>>> good prices, I bought 3 new on the boxfor $50 included shipping.
>>>
>>> http://ftp.blackbox.com/manuals/C/CL051A(E)(C)%20Manaul.pdf
>>>
>>> The spec is 20 or 60 mA. I've not tried one at 60 mA but is in the spec
>>>
>>> -pete
>>>
>>
>> And here we always warn that most such devices are designed to work with
>> low-voltage current loops as in the Teletype Model 32/33/35 family, and
>> not with the older equipment that uses 120 volts at 20 or 60 ma.  For
>> the latter you need something like a high-voltage transistor or a solid
>> state relay IC.
>>
>>
>> ______________________________________________________________
>> GreenKeys mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:GreenKeys at mailman.qth.net
>>
>> 2002-to-present greenkeys archive: http://mailman.qth.net/piperma
>> il/greenkeys/
>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive
>> /greenkeys/greenkeys.html
>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>> http://comcents.com/tty/greenkeyssearch.html
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20180224/3a7aef36/attachment.html>