Simple Photocell Power Supply using MAX630

Simple Photocell Power Supply using MAX630
This is a simple and easy build photocell power supply. It uses 8 pieces of photocell and single regulator IC of MAX630. This circuit capable to deliver either 4.8 or 7.2 V regulated at 15 mA with a 3-V input from a bank of photocells. R1 should be 453K Ohm for a 7.2-V output and 274K Ohm for a 4.8-Vdc output. Regulator efficiency of this circuit is about 70%. (more…)

Battery Charger Powered using Single Solar Cell

Battery Charger Powered using Single Solar Cell
This is the schematic diagram of battery charger circuit that powered using single solar cell. The circuit designed using MC14011B  manufactured by ON Semiconductor. CD4093 can be used to replace MC14011B. Supply voltage range : 3.0 VDC to 18 VDC. (more…)