How to make an old 12V charger

A full range of storage battery lead mould, battery shell, positive plate and negative plate, separator, column connection pole lead plate, battery cover, charging flap, electrolyte, lead

Car battery after a long time in the home, father often can't start the car, especially in the winter cold day, car dozen not dozen don't respond, so my father do it yourself for a 12 v battery charger, dad when I was young and like make electronic production, like to study. Charger after the best dad let me share this charger to you, he said that in some places might be unreasonable, hope knowledgeable and dad communication, discussed the technology, many thanks! I put my dad's homemade process as experience, because he is layman don't understand, may in some places to write wrong, please forgive me!

The most before the first of all, need a 12 v battery charger circuit diagram, dad said it is good to have the figure made, in accordance with the drawings can be clear, convenient to begin production.

Homemade 12 v battery charger

To prepare the required materials, you first need to an output ac 12 v5-15 a ac transformer 1, 6-10 a high-power rectifier diode 1, 25 v2200uf condenser tube 1, low voltage power supply control switch 1, 1 220 v power plug, insulation tape 1. You also need to diameter is greater than the high power rectifier diode 0.3 cm30 to 50 cm in diameter rubber hose 1 root (anti leakage type, rectifier diode cooling), plastic bottles a rectifier diode (cooling)

Homemade 12 v battery charger

The 220 v power plug and transformer input wire connection is good, respectively connected by insulating tape will head wrap. Because the ac power is not negative, so the input random pick up, but the input and output don't make a mistake, in transformer shows that the input and output, must see clearly.

Homemade 12 v battery charger

The rectifier diode at each end with the same length of wire is good, but the total length of more than 30-50 cm the length of the rubber hose, then end through 30 to 50 cm, rubber hose, rectifier diodes in the intermediate position of the rubber hose.

Homemade 12 v battery charger

The 12 v output end of a line and the transformer rectifier diode the positive (or negative) end will be connected with wires and insulation tape head wrap.

Homemade 12 v battery charger

The 12 v output transformer another thread and the positive (or negative) at the connection of the condenser tube, negative (or positive) side and rectifier diode negative (or positive) and wire connection, connected by insulating tape will head wrap.

Homemade 12 v battery charger

5 Again the terminals to the condenser tube of positive and negative wires (lead, that is, connect the battery at the ends of the line), is extremely connected to the low voltage power supply control switch and the wires and negative extreme length, connected by insulating tape will head wrap.

1.The simplest way is to find a dc power supply, dc measurement must be higher than 13.8 V (because of lead-acid battery charging termination voltage is about 13.8 V), then the computational capacity, for example, your level is 12 v8ah.Then you must make your charging loop current is less than 0.8 A, then charge to have bubbles appear, then stop charging. If it is constant current charging, then about 10 hours.2.Find a AC220V variable AC15V transformer, and then to prepare a rectifier stack, a 25 v, 470 micro method of electrolytic capacitor, a voltage regulator, 7812.From the transformer rectifier stack input output, from the heap rectifier output end and an electrolytic capacitor + - don't meet the, then most of 7812 + feet, 2 - foot, 3 feet for the output. Such a simple

AC220V AC15V transformer

To prepare a rectifier stack, another 25 v, 470 micro method of electrolytic capacitors, a voltage regulator, 7812 is ok

Identify diode is negative: here only for two kinds of diode, a kind of metal packaging diode as shown in figure 1, with one side of thread is positive, the other side negative.

How to make the old 12 v charger (a few 12 v battery charger design, rounding)

Another kind of plastic package ordinary diodes as shown in figure 2, for the average diode, can look after the body surface, with one end of the white line as the cathode.

How to make the old 12 v charger (a few 12 v battery charger design, rounding)

Identify transformer original secondary coil and the tap voltage:

Coil of thicker and less number of turns as the secondary coil, the other side as the primary coil.

How to make the old 12 v charger (a few 12 v battery charger design, rounding)

Taking voltage logo, the logo can be.

How to make the old 12 v charger (a few 12 v battery charger design, rounding)

Assembly:

Will switch, insurance, plug and primary coil string by sheath line, connect a line of secondary coil diode of the anode, diode cathode connecting a red line, even on the conductive clip, on the other side of the secondary coil connected to black conductor is also connected to the conductive clip, charger assembly is complete.

When using, connect the black wire clamp battery cathode, red wires connect battery anode, will play to 50 V dc voltage multimeter, red pens and battery positive electrode, the black pens and battery cathode, monitor the battery voltage, when the voltage is 13.8 V - 14 V batteries fully charged.

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