| ??? 09/14/07 04:11 Read: times |
#144606 - Schematic Responding to: ???'s previous message |
Schematic is put here. I realise i should have done that earlier. No wonder a picture is worth a thousand words!!
I am using Two BJT (in cascade)to generate about 150mA of current to run the relay. A port pin should not be connected directly to run the relay as it cannot handle currents in excess of 10-15mA for complete port pins. 
If the input required to drive the relay is say 150mA then with gain of BJT as 50 The value of Resistance R= (Vin-(0.7+0.7))/(150mA/50)= (5-1.4)/3 KOhm = 1kohm (approx). This will draw 3mA/50 =0.06mA from the uC port pin. This amount of curent can easily be handled. |
| Topic | Author | Date |
| Operating Relay | 01/01/70 00:00 | |
| Link to data sheet | 01/01/70 00:00 | |
| What does the Datasheet say | 01/01/70 00:00 | |
| link to datasheet of CMX 469 as well | 01/01/70 00:00 | |
| managed to find it | 01/01/70 00:00 | |
| A diagram would help | 01/01/70 00:00 | |
| Schematic | 01/01/70 00:00 | |
Driving Relays | 01/01/70 00:00 | |
| Relay? | 01/01/70 00:00 |