汽车电池充电器电路 (Car Battery Charger)

This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycle has finished.

Schematic

Parts

Part
 Total Qty.
 Description
 Substitutions
 
R1
 1
 500 Ohm 1/4 W Resistor
 
 
R2
 1
 3K 1/4 W Resistor
 
 
R3
 1
 1K 1/4 W Resistor
 
 
R4
 1
 15 Ohm 1/4 W Resistor
 
 
R5
 1
 230 Ohm 1/4 W Resistor
 
 
R6
 1
 15K 1/4 W Resistor
 
 
R7
 1
 0.2 Ohm 10 W Resistor
 
 
C1
 1
 0.1uF 25V Ceramic Capacitor
 
 
C2
 1
 1uF 25V Electrolytic Capacitor
 
 
C3
 1
 1000pF 25V Ceramic Capacitor
 
 
D1
 1
 1N457 Diode
 
 
Q1
 1
 2N2905 PNP Transistor
 
 
U1
 1
 LM350 Regulator
 
 
U2
 1
 LM301A Op Amp
 
 
S1
 1
 Normally Open Push Button Switch
 
 
MISC
 1
 Wire, Board, Heatsink For U1, Case, Binding Posts or Alligator Clips For Output
 
Notes
1. The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors border=0>
Part
 Total Qty.
 Description
 Substitutions
 
C1
 1
 6800uF 25V Electrolytic Capcitor
 
 
T1
 1
 3A 15V Transformer
 
BR1
 1
 5A 50V Bridge Rectifier
 10A 50V Bridge Rectifier
 
S1
 1
 5A SPST Switch
 
F1
 1
 4A 250V Fuse

5. The first time you use the circuit, you should check up on it every once and a while to make sure that it is working properly and the battery is not being over charged.