| ??? 07/02/07 14:35 Read: times |
#141415 - What ? Responding to: ???'s previous message |
Hytham Sohl said:
the 8051 gets hot because current is drawn from it You have a damaged Micro. It should NOT get hot! any solution????? As Andy said, you can't source much from an 8052 pin, and as Richard said, you can't use any old relay with any old transistor and get THAT to work. The BEST solution is TWO transistors - a PNP, followed by an NPN to your relay. This very old post by Mike Karas details an extremely effective design. http://www.8052.com/forum/read.phtml?id=74657 Steve |
| Topic | Author | Date |
| driving relay | 01/01/70 00:00 | |
| Base resistor | 01/01/70 00:00 | |
| Previously discussed | 01/01/70 00:00 | |
| Status LED | 01/01/70 00:00 | |
| What gets hot? | 01/01/70 00:00 | |
| relay specifications? | 01/01/70 00:00 | |
| mc gets hot | 01/01/70 00:00 | |
| What ? | 01/01/70 00:00 | |
| Reading time! | 01/01/70 00:00 | |
Still no relay spec's | 01/01/70 00:00 |