About the article

Desulphater for Car Batteries

Even if you take great care of your car or motorbike battery, you're bound to have noticed that its life is considerably shorter than the high purchase price and sales pitch probably led you to expect. Of course there are several reasons for this, and high on the list is the phenomenon of slow but inevitable sulphating of the plates. Here' a circuit to prevent as well as combat sulphation.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list

R1 = 470k?

R2 = 22k?

R3 = 330?

R4 = 220?


C1 = 100?F 25 V

C2 = 100nF

C3 = 2nF2

C4 = 47nF

C5 = 100?F 25 V, low ESR


D1 = 15 V 0.4 W zener diode

D2 = BYW29-100

IC1 = NE555

T1 = IRF9540


L1 = 220?F 3.5A

L1 = 1mH 1A

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