I for one would at least like to hear if someone see any remote problem with this type of mod?
KI4DGH Chuck > > From: "Dick Harms PA2DW" <[EMAIL PROTECTED]> > Date: 2005/04/22 Fri PM 01:49:12 CDT > To: "'Elecraft Reflector'" <[email protected]> > Subject: [Elecraft] KX1 battery > > Hi all, > > Some days ago I posted a message regarding the charging of NiMh battery's. I > got only one reaction, so I guess many are wondering what is a good way! I > decided to go for the experimental way and did the following: > - Measure the supply voltage, we call that U1; > - Measure the battery voltage in charged situation, we call that U2; > - Take U1-U2 and devide that over the charging current you want to use. In > case of my 2400 mA/h cells I decided for a "conservative" 200 mA; > - The result is the resistor value, in my case about 33 Ohm; > - Take the square of U1-U2 and devide over R and you have the power, in my > case between one and 2W. > I had a 33 Ohm resistor of 5W in stock which was only 0,3 inch, so it fits > very nicely. I have mounted it on the component side of the pcb, otherwise > it gets in the way of the battery! > > The result is very positive, it charges nicely. I have mounted a timer in > line with the charging supply, an old Nokia 12V GSM supply, to avoid > overcharging as I read that NiMh cells dont like that. > > Have fun! Oh and by the way; modifying is at your own risk and will probably > violate the warranty. Or perhaps Wayne and Eric find it such a good idea > that they will allow it ;) > > 73, Dick PA2DW > > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
