Make a 5volt 8-100mAmp transformerless electronic power supply or cell phon battery charger at home

How to make 5volt 8 to 100mAmp transformerless electronic power supply or cell phon battery charger simple compact, efficient and cheap at home.

By:Alok kumar

Almost all of our electronic products or projects, we need a compact cheap power supply for converting mains AC voltage to a regulated DC voltage. For making a power supply designing of each and every component is essential. Here I’m going to discuss the designing of  regulated 5V Power Supply.

To make a transformerless electronic power supply or Capacitor Power Supplies, we use a Voltage Dropping non polar Capacitor in series with the main line. An ordinary capacitor can not be used in these applications because Mains Spikes may create holes in dielectric of ordinary capacitors and the capacitor will fail to work or even may explodes. This may destroy the device connected to such power supply. Thus we use X Rated Capacitor with required voltage is used for this project. X Rated Capacitors rated for 250v, 400v, 600v AC and higher voltage levels are also available. Reactance of the voltage dropping capacitor should be greater than the load resistance to keep constant current through the load otherwise the current may drop when connected to different loads.

Simplest 5V Transformerless Power Supply Circuit

How to make Simplest Transformerless power supply for low current and low voltage application(5volt 150mAmp) using a IC-LR645

By:Alok kumar

Some of the followers of this blog have requested to post a simple low current and low voltage i.e 5volt & 100mAmp. So today i am going to post an transformerless power supply which is not only easy to construct but also very cheap and small or compact electronic circuit. This electronic circuit can be used to for various purpose like charging small li-ion batteries e.t.c. In this circuit we are going to use IC-LR645 which can control any voltage between 24 and 270 V AC and produces DC voltages below 15 volts at the output, which becomes ideally suitable for operating condition.

The great thing about this circuit is that it does not include or incorporate any bulky transformer but it also dont uses high voltage polar capacitors here. So no worries about surge current and we don't need crowbar protection circuit here.