555 IC automatic battery charger circuit diagram(2)

Published:2011/5/11 4:06:00 Author:Ecco | Keyword: 555, IC , automatic , battery charger | From:SeekIC

RS flip-flop is composed of A 555 circuit, The two internal comparator reference voltage is supplied by external regulator VS commected to pin 5, so the reset level of circuit is VS's regulator value, which is 3V. The seting circuit of the upper limit charge voltage is composed of the resistor R3 and potentiometer RP2; The seting circuit of the lower limit charge voltage is composed of potentiometer RP3 and resistor R4. The power supply is stepped-down by the T transformer, rectified by diodes VD1 ~ VD4 and filtered by capacitors C1.VD1 ~ VD5 use IN4001 rectifier diodes. VS selects 3V, 1/2W Zener diode, such as UZ-3.0B, IN5226. VL uses an ordinary red LED. RP selects 2W wirewound potentiometer; RP2, RP3 use an ordinary small-scale synthesis of carbon potentiometer, such as WH5; R1 ~ R4 select 1/8W carbon film resistors. C1 selects CD11-25V aluminum electrolytic capacitor. T uses 220V/15V, 5VA small, high quality power transformer.



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