| ??? 11/29/10 16:29 Read: times |
#179708 - LED "Throwies" |
I just happend upon this at http://www.electronicsweekly.com/gadget-master
Electronics Weekly said:
They say it's based on/inspired by the LED Throwies described by the Graffiti Research Lab: http://graffitiresearchlab.com/projects/...-throwies/ http://www.youtube.com/watch?v=YjTP_T-wR9w As far as I can see, these have the LED connected directly across the coin cell with no current limiting resistor! Presumably, this relies upon the coin cell having a sufficiently high internal resistance to limit the current through the LED? But is this a safe assumption...? |
| Topic | Author | Date |
| LED "Throwies" | 01/01/70 00:00 | |
| Built in? | 01/01/70 00:00 | |
| RE: Built in | 01/01/70 00:00 | |
| I measured 80mA... | 01/01/70 00:00 | |
| Cheap batteries | 01/01/70 00:00 | |
| are resistors expensive? | 01/01/70 00:00 | |
| There's the thing... | 01/01/70 00:00 | |
| No, but uncool! | 01/01/70 00:00 | |
| Uncool | 01/01/70 00:00 | |
| Yes, even dangerous... | 01/01/70 00:00 | |
Longer lead | 01/01/70 00:00 | |
| Yes - but... | 01/01/70 00:00 | |
| No resistors | 01/01/70 00:00 | |
| Life-times... | 01/01/70 00:00 | |
| Indeed! | 01/01/70 00:00 |