TI-59 question

From: Carlos Murillo <carlos_murillo_at_epm.net.co>
Date: Mon Aug 12 23:37:01 2002

At 06:54 PM 8/12/02 +0100, you wrote:
>Failing that, if you can find the right connector (possibly from another
>TI calc PSU) the TI-59 requires 6.2V 200mA AC.
>
>I always wanted a TI-59, but I have to make do with a -58...

You can probably build something with epoxy/rubber and a couple
of pins off a female DB-25 connector..

A word of caution: if you are going to build a charger with a 6.3V
transformer, keep in mind that the chargers that TI provided
for this and other calculators had very high secondary winding
resistances; I just measured mine, and it is 16 ohms. I have
no idea about the reactance, though.

The high resistance in effect limits the maximum current across
the rectifier diodes and battery. I suspect that if you connect
a < 3ohm transformer something might burn.

carlos.


--------------------------------------------------------------
Carlos E. Murillo-Sanchez carlos_murillo_at_nospammers.ieee.org
Received on Mon Aug 12 2002 - 23:37:01 BST