A trickle charger is a device that provides a small amount of electrical current to a battery over a long period of time. This can be useful for maintaining the charge of a battery that is not being used regularly, such as a battery in a car that is not being driven.
There are many different types of trickle chargers available, but the best DIY 12v trickle charger is one that is simple to build and uses inexpensive components. One popular design uses a transformer, a rectifier, and a resistor. The transformer steps down the voltage from the wall outlet to 12 volts, the rectifier converts the AC voltage from the transformer to DC voltage, and the resistor limits the current flow to the battery.
