.:madworm:.'s photos with the keyword: boost converter

Step-up converter with LT1618

17 Dec 2009 91
The current sensing resistor is still missing as I couldn't find 0.22Ω anywhere, but the chip also has adjustable output voltage support. I just measured the LED current and adjusted the voltage. That's not the right way, but this was an "emergency build" ;-) Edit: The [expletive deleted] chip is dead !

Step-up converter with LT1618

17 Dec 2009 95
The current sensing resistor is still missing as I couldn't find 0.22Ω anywhere, but the chip also has adjustable output voltage support. I just measured the LED current and adjusted the voltage. That's not the right way, but this was an "emergency build" ;-) Edit: The [expletive deleted] chip is dead !

Boost converter

28 Feb 2012 97
This one is quite good. Doubling from 2V to 4V still gives several hundred mA of juice. Nice. And the little chip didn't even get warm.