| ??? 12/07/04 18:58 Read: times |
#82713 - Port Powered Circuits Responding to: ???'s previous message |
A certain amount of power can be obtained from COM port. It depends upon your COM port and the load requirement.
Usual method consists of setting the unused port pins (e.g. RTS, DTR in your case) at +12V and using schottky diodes to OR them and then using a Low DropOut (LDO) type regulator. I have used this scheme in my Isolated RS-232 to TTL converter which uses a MAX232 and two optocouplers and the ciruit works fine at 115000 baud. Warning: You can easily ruin your COM port. Be very very careful (especially if you are playing with laptop)!! |
| Topic | Author | Date |
| COM port pin as 5 or 9 v power supply. | 01/01/70 00:00 | |
| COM port pin as 5 or 9 v power supply | 01/01/70 00:00 | |
| Port Powered Circuits | 01/01/70 00:00 | |
| Ruin your COM port? | 01/01/70 00:00 | |
| Why you can ruin Easily the COM port? | 01/01/70 00:00 | |
| To Ijaz Ahmed | 01/01/70 00:00 | |
| Re: To Ijaz Ahmed | 01/01/70 00:00 | |
| Where does 8051 fit in your project? | 01/01/70 00:00 | |
point of the question | 01/01/70 00:00 | |
| Charge Pumps/DC-DC converters | 01/01/70 00:00 | |
| Watch for the transceiver. | 01/01/70 00:00 | |
| RE | 01/01/70 00:00 |