Advice 1: How to make the most charger for the car battery

If the car battery is dead and charger is not around, don't despair, it's not a reason to panic. Using parts from the old black and white TV, you can make your own hands a great charger for the car battery.
How to make the most charger for the car battery
You will need
  • The transformer TS-180-2, wire size 2.5 mm2, four diode Д242А, network plug, a soldering iron, solder, fuses 0.5 A and 10A.
Take the TS-180-2 (power transformer from black-and-white TV). It has two secondary windings, which are designed for a voltage of 6.4 V and a current of 4.7 A, connect them in series, thus obtained output voltage is equal to 12.8 V. It is enough to charge the battery. On the transformer, connect the wire cross-section 2.5 mm2 pins 9 and 9` and the terminals 10 and 10`, wire cross-section 2.5 mm2 solder a diode bridge which consists of four diodes Д242А, fit and others that are designed for a current of 10 A.
Install diodes on the big heat sinks. The diode bridge assemble on glass fibre laminate wafer of the desired size. Connect the primary winding of the transformer in series, place a jumper between terminals 1 and 1` , to the terminals 2 and 2` and solder the cord with plug for 220 V. In the primary and secondary circuits replace fuses, respectively – 0.5 A and 10 A.
Unplug the charger. Reconnect the battery. The voltage at the battery terminals during charging should not be more than 14.5 V. To control the current and voltage, connect a charger ammeter with a scale dimension of not less than 10 A, and a voltmeter with a scale dimension of not less than 15 V. Also, it is possible to control with a multimeter, which limit the measuring current should be at least 10 A. Limit the charging current by including in series in the gap "minus" wire 12 Into the light output of 21-60 W.
It is impossible to test the device "on a spark". It is impossible to connect to confuse "+" with "-". Follow fire safety rules. Do not leave the appliance unattended. Definitely obestochivaete device when connected to a battery.
Useful advice
Schematic diagram of the installation:

Advice 2 : How to charge battery aa

Batteries size AA are among the most common. They may have a capacity from 450 to 2500 milliampere-hours. Such batteries represent an advantageous alternative to the conventional batteries of the same size.
How to charge battery aa
Before you make any transactions for charging accumulators of size AA, make sure:
before you do the batteries, not the batteries;
- what batteries are Nickel-cadmium or Nickel-metal hydride, not any more.Remember that the presence of the word "charge", "recharge" or "rechargeable" does not always says that the device is a battery. They can be part of the revs "not rechargeable", "non-rechargeable", "do not recharge" or similar. All this warnings about that before you battery and that the charge does not have to.
Look at the battery capacity symbol. Usually it is expressed in milliampere-hours. Ensure that it is in amp-hours. Divide the resulting number by ten. You will get the rated charge current, expressed in amperes. For example, the capacity of the battery is 1500 mAh, or equivalently, 1.5 Ah. Then the charge current is 0.15 A.
To charge the batteries of size AA, it is more rational not in pairs as is usually done, but one at a time. The power source for use with an output voltage equal to 3 V.
Series with each of the rechargeable batteries include a resistor whose value calculate in the following way. Since the voltage of the discharged battery is 1.1 V, and a power source - 3 V, the voltage drop across the resistor at the beginning of charging will be 1.9 V. Divide this value by the charging current, expressed in amperes, you will receive the value of the resistor expressed in ohms. By the end of the charging, as the battery voltage rises, the charge current it will slightly fall.
Calculate the minimum wattage of the resistor. To do this, multiply the voltage drop across it to the current charge. If the latter is expressed in amperes, the power obtained in watts.
Connect the battery in series with a resistor to the power source in the polarity corresponding to the same indicator of the source. Keep charging for 15 hours.
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