Hi all, i'm putting together a set of backlit numbers for my street front (the neighbors constantly get our uber-eats)
The goal is a basic outdoor LED, daytime charges the battery, LEDs come on automatically at dusk.
The numbers have a total of 14 white leds in series and using benchtop PSU i've confirmed they'll run happily at 43v 600ma, though i could throw in a 10k resistor to drop the current a little for longevity and power saving. i've also checked the battery and XL6009 can power the leds
The only part I'm not familiar with is n-P-n Transistors, i've put together the below and i think it's right but thought i'd ask for confirmation.
i'm reasonably confident that when 7v flows from the LM317, this will pass through the Transistor base, out the Collector, charging the battery.
When the LM317 voltage drops (at dusk) it'll turn on the transistor load, sending power to the XL6009, which will output the required 43v
The goal is a basic outdoor LED, daytime charges the battery, LEDs come on automatically at dusk.
The numbers have a total of 14 white leds in series and using benchtop PSU i've confirmed they'll run happily at 43v 600ma, though i could throw in a 10k resistor to drop the current a little for longevity and power saving. i've also checked the battery and XL6009 can power the leds
The only part I'm not familiar with is n-P-n Transistors, i've put together the below and i think it's right but thought i'd ask for confirmation.
i'm reasonably confident that when 7v flows from the LM317, this will pass through the Transistor base, out the Collector, charging the battery.
When the LM317 voltage drops (at dusk) it'll turn on the transistor load, sending power to the XL6009, which will output the required 43v