First power supply circuit is built with BD139, one zener diode and a few passive components. Each of the schematic is very simple to construct and will function without problems if you respect the ...

Here is a tried and tested sample circuit of a Li-Ion battery charger that can be used to charge any 3.7V Li-Ion battery using a 5VDC (USB, Solar Panel…) power supply. At the heart of the circuit is ...

We can see how circuits work, and represent them with some simple diagrams, using basic electrical ... These could be batteries, solar panels, or a power supply connected to the mains - anything ...

The NEC defines such circuits as that portion of the wiring system between the load side of the overcurrent protection device (OCPD) or the power-limited supply and all connected equipment. These ...