(Cont’d from previous blog)
During the early days of my LED lights, I did some conversions of regular flashlights. The one in the picture is a Craftsman that used four AA cells and a regular incandescent flashlight bulb. I took the bulb out, broke the glass and removed it, and put three white LEDs, each with its own 33 ohm resistor in the lamp base. I made a dummy battery for the fourth AA cell. It worked reasonably well, but was somewhat bulkier than the Altoids tins – it wouldn’t fit in my pocket. The much smaller CMG Infinity light beside it was expensive, but served for several years as my keychain light. It was underpowered, with a single, not very bright LED. CMG held a U.S. patent on the circuit.
