[GreenKeys] RS232 to TTY Loop Boards

Mon Feb 16 14:35:18 EST 2015

yea  bolt it  to the  case!

yahoo for the  db 9!  '

In a message dated 2/16/2015 12:32:16 P.M. US Mountain Standard Time,  
lester at veenstras.com writes:

I am  thinking of a rework of the board to include the original DB9 
interface
and  the option of a USB to TTL/RS232 converter daughter board.
Also would  probably like to use a chassis mount power resistor for the loop
setting  value to allow better heat dissipation, for  example:

RH0102K000FE02

http://www.vishay.com/docs/30201/30201.pdf

Would  like to really find a nice cache of about 3k wire wound variable, 10w
or  larger reostats.
Other jumper configurable options of external loop supply,  bypass meter,
echo kbd loop to printer loop, etc
Also consider add a  diode bridge to receive opto isolator to remove loop
polarity  issues.

Lester B Veenstra  MØYCM K1YCM  W8YCM
lester at veenstras.com

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-----Original  Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On  Behalf Of
Jeffrey D Angus
Sent: Monday, February 16, 2015 11:33  AM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] RS232 to TTY  Loop Boards

Perhaps I wasn't quite clear on this.
I'm NOT making the  boards.
I _am_ offering to assemble them if you don't want to make them  yourself.
Labor to assemble them is roughly $10 each +  shipping.

However, that being said, If I get enough orders for boards,  I can have 
them
made via ExpressPCB. They are, not cheap. For example,  a 1.9" x 2.2" board,
double sided with solder mask and silk screen is  roughly $300 for twenty of
them. So $15 apiece.
Without the silk screen  and solder mask, the cost drops down to $153 or
about $7.65 each.
The  "set up cost per order" is the real cost here. $245 for the full 
board,  and
$61 for the one without the solder mask and silk  screening.

Obviously, if you all go crazy and order enough of them, it  brings the 
total
distributed costs down. For example, 40 of the simple  boards drops down to
$5.85 apiece instead of $7.65.

Then, there's  also the cost of the parts for the boards. Mouser does give a
price break  on quantity. So that helps.

However, both the PS7141E and the thick  film 10 watt resistor are non-
stocked items. The cost of them are about $3  each.

If y'all want me to, I will sit down, do a PC board layout for  currently
available parts, and an itemized parts list with costs for all  three items.
Parts, PC board and Labor. My guess at this point is going to  be around
$30 per board assembled. Closer to $40 if you want the pretty  boards
with solder mask and silk screen.

--  
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com

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