| ??? 02/29/08 17:08 Read: times |
#151681 - Did Ben ever say what power? Responding to: ???'s previous message |
I didn't see where Ben said if the "connected power" was DC or AC, or AC line, etc. If it is AC line one could use capcitively coupled power (Search Microchip website for TB008 and AN954 for transformerless power)and avoid a battery. And use a very high value resistor tied directly to the line (depends on chip inputs - use a 74HC14 if necessary - it's inputs are clamped - just avoid exceeding specs for input current) to get an accurate 60cycle reference for timing. Also make sure not to exceed the voltage rating of resistor. I use 2 resistors in series each separately of a suitable rating - likely both will not fail...
Dale |
| Topic | Author | Date |
| Basic Microcontroller Timer | 01/01/70 00:00 | |
| Very Posible | 01/01/70 00:00 | |
| Basic timer | 01/01/70 00:00 | |
| Basic timer | 01/01/70 00:00 | |
| Basi Timer | 01/01/70 00:00 | |
| I would discourage using a watch battery ... | 01/01/70 00:00 | |
| Basic Timer | 01/01/70 00:00 | |
| step by step, first steps | 01/01/70 00:00 | |
| good advice, wrong address | 01/01/70 00:00 | |
| There are 7-segment LCD's | 01/01/70 00:00 | |
| no surprise, just a memory jolt | 01/01/70 00:00 | |
| Basic Timer | 01/01/70 00:00 | |
| PIC | 01/01/70 00:00 | |
| Sorry! | 01/01/70 00:00 | |
| table lookup, multiplexing | 01/01/70 00:00 | |
The principles remain the same | 01/01/70 00:00 | |
| You need to learn about specifications | 01/01/70 00:00 | |
| Did Ben ever say what power? | 01/01/70 00:00 | |
| No, but | 01/01/70 00:00 | |
| ? | 01/01/70 00:00 | |
| Timewarp! | 01/01/70 00:00 | |
| No to point to the competition | 01/01/70 00:00 |