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When using a 12 V lamp, it's essential to provide it with a 12 V battery for optimal performance.
Also instead of a 12V power supply i am using (for now) a 9V battery. I use a bd237 Vcc->[collector] [emitter]->GND and [3]->56%u03A9->[base]... it works but it makes noise. Adding a 470%u03BCF across the bjt stops the noise, but now the fan goes full speed :(...
simple smart 2A Vapcell q2 2 slots charger 18650 battery charger for 18650 3.7v li-ion battery, You can get more details about simple smart 2A Vapcell q2 2 slots charger 18650 battery charger for 18650 3.7v li-ion battery from mobile site on Alibaba.com