1V LED Driver

268

05:15:38

gets a 2.7V LED running off a half-drained AAA cell.  In EC simulation the output cycles at 645Hz, but in reality it's actually 26.3kHz.  transformer is a 4.8mH line isolator from an old network card.

the high frequency is created from the 10nF cap on the bias resistor decoupling the transformer and holding the transistor base steady.  the LED makes the same amount of light, but the higher frequency makes the circuit much more efficient.  at 1V, the average drain on the supply is 12mA

published 11 years ago

ETJAKEOC

11 years ago

Faceblassssssst! D: It blows the LED

faceblast

11 years ago

no it doesn't :]

kada

11 years ago

It doesn't I have try

ETJAKEOC

11 years ago

It blows when I simulate it wtf xD

wyoelk

11 years ago

It blows it for me too. Scoped it at 150ma. KABOOM,

faceblast

11 years ago

check the google+ post

hurz

11 years ago

A almost empty battery increases its internal resistance dramatical, so place a e.g. 30Ohm in serial to it and you get closer to the real behavior in frequency.

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