| ??? 11/30/10 08:38 Modified: 11/30/10 08:39 Read: times |
#179734 - are resistors expensive? Responding to: ???'s previous message |
Per Westermark said: Would one extra resistor really blow up the budget?
I think the main trick is actually to use the cheapest possible batteries. Normally 2032 size but with half or maybe even 25% of the capacity of a "real" 2032 battery. The goal here is to build them for maybe $0.50 each, so we are not talking about high-end materials. (Okay I know it would complicate the mechanical part of the thing. Aren't there coin-cell-sized flat resistors around? Or some other, similarly sized/shaped part, providing the proper current limitation?) The result is very impressive, though. Jan |
| 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 |