| ??? 05/01/09 04:42 Read: times |
#164978 - Use this type circuit Responding to: ???'s previous message |
Use a circuit like shown below to drive your solenoid. Besides showing how to properly buffer your MCU pin to allow it to drive properly this also solves the problem is using active high output. At reset time the pin defaulting to input would go high and be slapping on your solenoid each time. A very undesirable characteristic. This design will let you drive the solenoid on by setting the output low.
- Michael Karas |
| Topic | Author | Date |
| Driving TIP120 from 8052 | 01/01/70 00:00 | |
| It is the Current | 01/01/70 00:00 | |
| Use this type circuit | 01/01/70 00:00 | |
| Thanks, I'll give it a try | 01/01/70 00:00 | |
| 0.1A | 01/01/70 00:00 | |
| Michael circuit is fine with some diff values. | 01/01/70 00:00 | |
| Success! | 01/01/70 00:00 | |
You use a Darlington, ... | 01/01/70 00:00 | |
| Check values | 01/01/70 00:00 | |
| is Q2 not a bit overkill? | 01/01/70 00:00 | |
| Base current and transistor beta | 01/01/70 00:00 | |
| logic level MOSFET | 01/01/70 00:00 | |
| they do make p-channel logic mosfets | 01/01/70 00:00 |