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Posted by Harsh dodia, on Sep-2009,
1. Complement
Sir the way you explain stuff is awesome...I understood everything u said ! Really a spl thx to you... 
I have 2 que: 
(1) If i use uln2003a to turn on/off a 4, 5v relay using 8051, is it necessary to connect a diode with uln2003 to eliminate BACK EMF ???? 
(2) can i connect the same 5v supply of 8051 to energies 4 relays or is it necessary to use separate 5v supply for relays ???? 
 
 
Waiting for your reply!!!
 
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