Ryobi Adapter

From Adam Colton
Revision as of 16:33, 18 October 2015 by Adamcolton (talk | contribs)
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They sell these, but they're underpowered. I'm going to build mine at 20V, that's what the 18V battery measures when it's charged.

I'll start with a 24V transformer. I found a MC33167 that might get it down to 20V (rate 5A). LT1270ACT is rated at 10A

this guy used 20 amps. I found this on Amazon, which seems like it would work pretty well.

Deep Cycle

The other option I'm considering is a deep cycle battery. The catch is that I can't get one near 20v, so I need a boost converter. But I can just double the voltage. The deep cycle battery would probably be around $25.

http://www.electroschematics.com/648/555-voltage-doubler/

http://www.circuitsgallery.com/2013/04/automatic-battery-charger-controller.html

Transistors need to be TO-3 packages.

  • Battery $25
  • NPN power transistor $2.50
  • PNP power transistor $2.50
  • Heatsink $3
  • Caps $3.75
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