| ??? 05/30/07 14:31 Read: times |
#140064 - not really Responding to: ???'s previous message |
so, in order to provide a collector current of about 1 ampere, you must provide a base current of about 1 mA. The 805x, in nearly any version, should be capable of providing that much current at its outputs.
not really, the ULN darlington requires a Vin of ~3V and no 'traditional' '51 can provide 1 mA at 3V. If you use a traditional '51 you will need either (recommended) a HC inverter or (second choice) pull-up resistors. Why do I not recommend pull-ups for this "it will work"?. When operating with motor drivers you often (especially during developement) get some huge 'kickback' (ground bounce or other nasty things) and a HC can take much more abuse than a '51. another advantage of using an inverter is that the motor coild will not be energized during reset. Erik PS why do you use a discontinued chip? |
| Topic | Author | Date |
| stepper motor voltages | 01/01/70 00:00 | |
| any schematics? | 01/01/70 00:00 | |
| Something not right | 01/01/70 00:00 | |
| Consult the stepping motor datasheet | 01/01/70 00:00 | |
| not really | 01/01/70 00:00 | |
| experience ... | 01/01/70 00:00 | |
| Discontinued? | 01/01/70 00:00 | |
I do not recall which manufacturer | 01/01/70 00:00 | |
| What is type of your motor? | 01/01/70 00:00 | |
| pay attention to the specifications | 01/01/70 00:00 | |
| Alternatives | 01/01/70 00:00 | |
| There are more general places to look | 01/01/70 00:00 | |
| Everything in one IC | 01/01/70 00:00 |