|
Open your old battery up, remove the cells.
Put a small hole in the bottom of the shell for the cable.
Solder the wires in, + and - to the terminals (Use a multimeter to check which is + and - before you remove the cells) and a plug on the other end. Glue the shell together again.
Get a small metal jiffy box and mount a LM7808 regulator inside.
Run a 9V 1.5 A plugpack into it via a socket, run the LM7808 output to another socket (Both fitted on the jiffy box).
Add a fuse, couple of 4000uf caps inside the jiffy box, and thats that.
I have been using this adapter for 2 years now, and not one problem.
Cost me $15.00 plus $9.00 for the cost of the battery.
Plugpack i already had.
Original Battery voltage is 7.2 , the 8V regulator less a small drop over the length or wires will be very close if not dead on this voltage.
Of course, if your in the field, then a SLA battery will do in place of the plug pack
|