Multipurpose Battery Eliminator Circuit using 4017 Decade Counter

Posted on Feb 4, 2014

Battery Eliminators are the circuits, which creating DC power supply from AC Mains. Basically battery eliminator circuits are the compination of step down transformer, rectifier and voltage regulator. Here is a simple circuit of a Multipurpose Battery Eliminator, which has different range of out put voltages controlled by a decade counter 4017 ic

Multipurpose Battery Eliminator Circuit using 4017 Decade Counter
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chip. First of all we need to convert AC to DC, which is doing by a Rectifier Circuit and we are creating a pulse generator using 555 timer IC wich is wired as Monostable mode After this the pulse is connecting to the decade counter 4017. Normally decade counter have ten out put shift register but here, in this circuit we are using only 5 out puts and 6th out is using to reset this shift register. These out puts of the shift register are connected to the base of transistors, which is connected with voltage regulators (zener diods are used in this ciruit). In this circuit NE555 timer IC is wired as monostable miltivibrator and the third pin, out put pin of timer is connected to pin number 14 of 4017, which is the clock input. Pin 3, 2, 4, 7 and 10 of 4017 is using outputs 1, 2, 3, 4 and 5 respectively. The sixth out put pin 1 is connected to the reset pin (15). Then the SL100, the PNP transistors are using to switch between diffrent voltages by diffrent voltage Zener Diodes. Each transistors will conncted while getting base voltage from 4017 and entire zener will be connected as voltage regulator.

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