| ??? 07/22/05 05:04 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#97779 - Mr. Karas's Relay Drive Circuit. Responding to: ???'s previous message |
Dear Michael,
You cannot drive relays directly from micro port pins due to sink and source currents of micro being very small. [ Sorry for Echo ]. One of the best circuit for relay driving I have ever seen is given below. It was designed and posted by Mr. Michael Karas [ Sad, he has left the forum ] 
I have used this circuit in many applications, Relay, Pneumatic Valve Solenoids, Pulse Transformer Drive, For my Industrial Designs I normally use optocoupler 4N35 in between the two Transistors for Galvanic isolation. 
Regards, Prahlad Purohit |
| Topic | Author | Date |
| 8052 Not coiling Relay from a pinout. | 01/01/70 00:00 | |
| Read Datasheet | 01/01/70 00:00 | |
| Stop now | 01/01/70 00:00 | |
| Try some of these links on the forum | 01/01/70 00:00 | |
| you need a buffer | 01/01/70 00:00 | |
| Mr. Karas's Relay Drive Circuit. | 01/01/70 00:00 | |
| Re: Mr Karas's Relay Drive Circuit | 01/01/70 00:00 | |
[ Sad, he has left the forum ] | 01/01/70 00:00 |