LED power supply - Single AA cell powers two LEDs at constant current HOME

AA cell powers two LEDs at constant current

Efficiency can be increased by using a germanium transistor at the 33 ohm current sense resistor, and by using a proper torroid core in place of the crappy ferrite bead.

The tiny ferrite bead transformer is easy to make

I do not gaurantee the accuracy or safety of any information herein.
This is only a graphic due to spam     HOME     Valid HTML 3.2!
Do not experiment with or build any of the above circuits.