6Volt Gel Cell Charger Circuit DiagramThis Circuit needs a adapted 10V-DC advanced end able of bartering 2 Amps. Starts the allegation aeon at 240mA and at abounding allegation switches automatically to a float action (trickle charge) of 12mA.
The capacitors are the bowl 50V (or better) type. Switching transistor Q1 is a NPN, Si-Power Output/SW, with a TO-220 case and can be replaced with a acceptable acting like the NTE291, ECG291, etc.
Timer/Oscillator U1 is a 8-pin NE555V and can be replaced with a NTE955M or ECG955M.
Resistors R4, R5, R6, and R7 are 1% metal blur types. They may not be accessible at your bounded Radio Shack/Tandy abundance and accept to be ordered in. Try Electro-Sonic or Newark Electronics accumulation stores.
Part List
Resistors are carbon, 1/4 watt, 5% tolerance, unless otherwise indicated.
R1 = 22 ohm, 1W C1 = 0.1µF, ceramic
R2 = 270 ohm C2 = 0.1µF, ceramic
R3 = 220 ohm D1 = 1N4001
*R4 = 715 ohm, 1% Q1 = TIP31A, B, C (or equivalent)
*R5 = 3.57K, 1% U1 = NE555V (or equivalent)
*R6 = 1.40K, 1% S1 = Toggle switch, ON-OFF
*R7 = 1.47K, 1%
