1N5400 LM317T TDA2003 NTE1288 ECG1288 LM317

limiting section Voltage doubler circuit (only needed for 3 Li-Ion cells or more) Lithium-Ion charger circuit 20w 12v* 1N5400

Current limiting section Voltage doubler circuit (only needed for 3 Li-Ion cells or more) Lithium-Ion charger circuit 20w 12v* 1N5400 1N5400 1N5400 1N5400 +In A+ +12v input (prototype) (8-18v possible) 2 5 IC2 1 390k +Out LM317T LM317T Adj 220uF 220 3v grain of wheat* 4 1uF Optional ammeter* + B+ Battery + 12.6v for 3 cells 8.4v for 2 cells 4.2v for 1 cell M - R1 = 1k8 (3 cells prototype) or 1k (2 cells) or 270 (1 cell) 220uF 3 500 2M2 0v Battery IC2 = TDA2003 TDA2003 (prototype) or NTE1288 NTE1288 or ECG1288 ECG1288 A- * = see text 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 LM317 design and the light bulb current limiter