[GreenKeys] A reliable current-loop-to-RS232 converter

[Bob Camp]

Hi

The “how” side of these little boards  is fairly simple:

They buy parts at 1/5 to 1/10 what we pay for them. The boards are fab’d for 
10 or 20 cents a piece. Assembly is cheap. They have a much larger internal market of 
experimenters than we do. Ageragate build volumes are fairly high. Since it’s all “internal 
market” goods when shipped outside the country, the government helps out on shipping. 

—

If you head over to the USB version of these things. Be very careful. You need a driver
to make a USB chip work and not all of the chips they pick up surplus have easy to 
find (over here) drivers. There are way to many combinations of operating systems, 
OS versions, chip vendors, chip versions, chip clones and languages to keep all the
bases covered all the time.

Bob


> On Aug 15, 2015, at 10:42 PM, Ralph Mowery <rmowery28146 at earthlink.net> wrote:
> 
> China has lots of similar items. Some are USB to ttl or maybe rs232.  I bought a couple a while back so I could program some old GE comercial transceivers.  It even had a led or two on  it so you could see if the data lines were doing anything.   I don't see how they can make the whole thing and ship it for less than the parts.  They usually take about 2 to 3 weeks to get here from China.  Often about 2 .
>  
>> ----- Original Message ----- 
>> From: COURYHOUSE at aol.com
>> To: rmowery28146 at earthlink.net ; teletypeparts at comcast.net
>> Cc: greenkeys at mailman.qth.net
>> Sent: Saturday, August 15, 2015 10:23 PM
>> Subject: Re: [GreenKeys] A reliable current-loop-to-RS232 converter
>> 
>> Cool!  I bought  a few  for me and a few  for  Gil to experiment  with.
>>  
>> In a message dated 8/15/2015 7:11:04 P.M. US Mountain Standard Time, rmowery28146 at earthlink.net writes:
>>> For $ 1.99 you can get them already on a circuit board ready to hook the wires to from China off ebay.  Lots of ones similar to this one.
>>> 231267556341
>>>  
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