WHERE TO GET ... PHONE CONNECTORS
Look into a minimum of five shops! You may either find a cheap (chinese) Headset, or sometimes universal
hands-free sets with connector-adapters sold seperatly. However, before buying such a thing, be sure,
that the connector can be opend (Screws or with a knife). In most connectors all pins are
available allthough headsets usualy use only 3 pins.
Austria, Vienna
There is a small dealer just before the exit opposite to Hilton at
Undergroundstation "Landstraße". (Weekdays 9?-17) ATS 99,-
Conrad (Germany, Austria, France, UK, Netherlands, Switzerland,...)
Part No. 760691
Warning: Feb.26th I bought that one, and it had
some pins cut off :(
US (Radio Shack)
Date: Sun, 11 Mar 2001 10:28:46 -0500
From: jay1@snet.net
Anyway just thought you would like to know that Radio Shack now offers a
perfect connector, complete with a mini circuit board for easy soldering and
testing.
It covers the 5100/6100 Series and basically converts interface to 2.5mm
headset plug, but its size, layout and ease of opening is perfect for making
a data cable, or what have you.
Part number is 17-537 and the cost is 7.99 USD.
CONNECTOR PINOUT
WHERE TO GET ... RS232 LEVEL-SHIFTER
The max3232 isn't really cheep. You may wish to either order it as sample or to try
dropin replacements by other Vendors (like the
ADM3202).
Whenever you order this Chip, be sure, to order not the smallest SMD-Variant, but something
you are able to solder. (DIL in most cases: max3232CPE and ADM3202AN)
Since a few people complained about the bad availability and/or price of the max3232 I considered several
ways of replacing them since PCs usually don't need the negative voltage produced by that kind of level-shifters.
4049 Inverter
Works well in 5V systems, but in our case we have a 2,8 V system.
(Open Collector) Inverter with big CAP
Someone can try this: use a big capacitor to store the high voltage of incomming signals.
Then use the cap to generate the "high" voltage for the PC... 5V is enough
Build your own Charge Pump
A problem is the low efficency when you start with such a low voltage, but it is possible.
See Sprut's Basics of Switched Power Supplies (in German).
I've made a couple of successfull tests with a voltage-trippler based on an 4093 Shmitt-Trigger oscilator and a couple of shottky diodes.
CABLES
Unshielded cables < 1,5m work perfectly. If you like to have longer cables, you should consider
using shielded types. If you have trouble getting a 7-wire cable for your DLR3, than you
can always use a CAT5-Cable.
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