Dave_H
Flashlight Enthusiast
Could someone recommend a simple, low-cost buck converter circuit to drive a single white (or other) LED at up to 20mA, from one 9v battery whose voltage could drop to less then 4v?
I've looked at a number of LED drivers but most are boost for driving multiple LEDs in series, for display backlighting. For long run-time I just want one LED driven.
NCP3066 is not bad but has fairly high internal consumption. Others don't take up to 9v (say 10v max.) on the inputs, or go below 4-5v on inputs.
I use small 9v snap-on caps with LED and switch which work OK but are still wasting most of the battery most of the time.
I have an nearly endless supply of 9v alkalines recovered from battery recycle which are still good, some appear virtually unused (topic for another discussion).
Dave
I've looked at a number of LED drivers but most are boost for driving multiple LEDs in series, for display backlighting. For long run-time I just want one LED driven.
NCP3066 is not bad but has fairly high internal consumption. Others don't take up to 9v (say 10v max.) on the inputs, or go below 4-5v on inputs.
I use small 9v snap-on caps with LED and switch which work OK but are still wasting most of the battery most of the time.
I have an nearly endless supply of 9v alkalines recovered from battery recycle which are still good, some appear virtually unused (topic for another discussion).
Dave
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