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Voltage doubler circuit only needed for 3 Li-Ion cells or more

Current limiting section 20w 12v

Voltage doubler circuit (only needed for 3 Li-Ion cells or more)
Current limiting section 20w 12v
Lithium-Ion charger circuit
1N5400 +12v input (prototype) (8-18v possible) 2
1N5400 A+ +In LM317T Adj 3v grain of wheat +Out 220
Optional ammeter
220uF
B+ Battery + 12.6v for 3 cells 8.4v for 2 cells 4.2v for 1 cell M
220uF
390k 0v
Circuit drawn by David Theunissen BTony van Roon is acknowledged for the voltage doubler circuit and the Sodbusters club are acknowledged for promoting the LM317 design and the light bulb current limiter