| ??? 04/21/10 05:59 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#175197 - Use due care... Responding to: ???'s previous message |
Brian:
Do use due diligence in evaluating a circuit used to drive high power loads. It is normally an important consideration that the default "out of reset" condition of the MCU port pins used to drive the buffer circuit place such circuit on the "OFF" state. In this context the "OFF" state refers to the condition where the load is not on its ON or active state. There can be a lengthy period of time from when the power is valid and the MCU is ready to program port pins into their intended idle states. For many drivers such as an LED or other harmless output a short ON blip at power-up is of little concern. On the other hand a circuit that energizes a big solenoid, motor, or power relay may have noise and safety problems associated with a momentary thrack at power up time. Michael Karas |
| Topic | Author | Date |
| high current output SSR or opto | 01/01/70 00:00 | |
| Something like this perhaps? | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 | |
| Use due care... | 01/01/70 00:00 | |
| expansion | 01/01/70 00:00 | |
| Depends | 01/01/70 00:00 | |
| I agree | 01/01/70 00:00 | |
| Bleh! | 01/01/70 00:00 | |
| I caught that... | 01/01/70 00:00 | |
| half voltage | 01/01/70 00:00 | |
| why load is there | 01/01/70 00:00 | |
| Check These Items | 01/01/70 00:00 | |
| Load Placement | 01/01/70 00:00 | |
| Load placement | 01/01/70 00:00 | |
| thank you everyone | 01/01/70 00:00 | |
| 3 ohm load | 01/01/70 00:00 | |
| good advice | 01/01/70 00:00 | |
| If I understood your requiremnt properly have a look ULN2003 | 01/01/70 00:00 | |
I don't think so | 01/01/70 00:00 |