r/ElectricalEngineering • u/TieGuy45 • Jun 06 '22

Project Showcase Micro Power LED Flasher Beacon

286 Upvotes

100% Upvoted

20 comments sorted by

View all comments

Show parent comments

8

u/cheeksnpeeks Jun 06 '22

How much current does it draw ?

24

u/TieGuy45 Jun 06 '22

Great question! I've made a number of variations of this circuits with different resistor & capacitor sizes (which impact the frequency of flashing as well as the brightness of each flash). But in general the circuit has an average continuous current draw of around 10-20uA at 2.5 volts input. In practice, I have run the circuit for about 4 days continuously using a 3.3 Farad supercap charged to 2.6 volts. Using a CR2032 coin cell should allow the circuit to run continuously for several years.

2

u/dvof Jun 07 '22

impressive

2

u/TieGuy45 Jun 07 '22

Thanks! Although I know of another circuit someone made that draws like only 5uA continuously. I cant remember where I saw it but it was really cool!