At the heart of the circuit is one microchip MCP73831, available in SOT-23-5 package. MCP73831 is a highly advanced linear charge management controller for use in space-limited, cost-sensitive ...

Resistors R3 and R5 limlits the output current (and hence the light output) of IC1 and IC2 circuits respectively ... Basically the pen torch circuit is a constant current charger wired around ...

Instead, battery charging is broken down into two distinct phases — constant current and constant voltage. The diagram below shows how voltage changes during charging and how that impacts the ...

Now we’re not entirely sold on this being a constant current charger circuit. The basic circuit is a voltage regulator, after all. Relying on the transistor’s current gain to be constant over ...