| ??? 03/01/11 00:52 Modified: 03/01/11 00:54 Read: times |
#181359 - I miss... Responding to: ???'s previous message |
...the obligatory 100nF caps at each chip right across the supply pins and at the input and output of 7805.
Increase the pull-ups from 1k to 4k7...10k. The RC-reset at µC is highly disadvantageous. Use a proper reset chip to provide a true power-on reset and brown-out detection. I like to use the MAX1232 and its built-in watchdog, like shown in this example here: 
Have the crystal oscillator components shortest connections, like shown in this example? 
Kai Klaas |
| Topic | Author | Date |
| Verifying Circuit and Program | 01/01/70 00:00 | |
| Attachement? | 01/01/70 00:00 | |
| Verifying Circuit and Program - Attachment ? | 01/01/70 00:00 | |
| You think we can all access your hard drive? | 01/01/70 00:00 | |
| You think we can all access your hard drive? | 01/01/70 00:00 | |
| As a member.... | 01/01/70 00:00 | |
| As a member.... | 01/01/70 00:00 | |
| I miss... | 01/01/70 00:00 | |
| I miss... | 01/01/70 00:00 | |
| Next try out | 01/01/70 00:00 | |
| caps in datasheet for 7805 | 01/01/70 00:00 | |
| caps in datasheet for 7805 | 01/01/70 00:00 | |
| Soldering the can... | 01/01/70 00:00 | |
| Price of MAX1232 to AT89S51 | 01/01/70 00:00 | |
| alternatives exists | 01/01/70 00:00 | |
| Great thanks | 01/01/70 00:00 | |
| Links... | 01/01/70 00:00 | |
| Update | 01/01/70 00:00 | |
| Some points... | 01/01/70 00:00 | |
Some Points Updated | 01/01/70 00:00 |