I purchased a cheap USB power pack, thinking it would be ideal for powering small projects. But it automatically shuts off if the device isn’t drawing a lot of power, since it’s meant for charging cell phones. Here’s a 2 transistor circuit I built this morning that keeps it on with very little battery drain by using brief pulses.
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Ladyada @adafruit & makers removed from @whitehouse website #WHChamps #NationOfMakers @mfgday @makerswomen
Wearables — Velcro dread
Electronics — Your job’s a joke, you’re broke, your semiconductor is DOA
Biohacking — Data After Death
No comments yet.
Sorry, the comment form is closed at this time.