| ??? 08/08/08 07:44 Read: times |
#157319 - More work with a 555 Responding to: ???'s previous message |
You can always use a 555 with a 10-way switch.
Calibrate the 555 by using a 100uF non-electrolytic capacitor. At a guess you will need switched resistances in the range of 150k to 250k. Or possibly use a 10uF with 1M5 to 2M5 resistors. The timing will not be very reproducible, and will definitely require some calibration. By the time that you have bought the 10-way switch and poly capacitor, you could have made it cheaper with a 8051. David. |
| Topic | Author | Date |
| timer | 01/01/70 00:00 | |
| Try an egg timer | 01/01/70 00:00 | |
| rather simple | 01/01/70 00:00 | |
| so google for NE555 applications | 01/01/70 00:00 | |
| More work with a 555 | 01/01/70 00:00 | |
| General Solution | 01/01/70 00:00 | |
| One step too far | 01/01/70 00:00 | |
| Don't overcomplicate! | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 | |
| 89C2051 fits the job | 01/01/70 00:00 | |
| Count your LEDs again | 01/01/70 00:00 | |
| I like the up/down switch idea but.... | 01/01/70 00:00 | |
| still there'll be 1 unused pin | 01/01/70 00:00 | |
| Surplus 7-segment digits. | 01/01/70 00:00 |