Wireless reciever HT12D - Electronic Circuits Projects Diagrams Free

mytech · 6th April 2008, 10:25 PM

Hi my proect is to control 2 device wireless.. what would initial output of 4 data lines in the circuit below?..
I want to use 2 data lines D1 & D2( to ground using 2 pushbuttons).. for to control 2 diff. 12v relays. Using which transistor can i drive 12v relay from 5v?..
which is the best solution for my task..
thanks..

KMoffett · 6th April 2008, 10:47 PM

Do you know the coil current or coil resistance for the 12v relays?...this will help choosing the right transistor.

Ken

mytech · 7th April 2008, 12:06 AM

Small current relay..

KMoffett · 7th April 2008, 12:35 PM

A 2N3904 with a 2.2KΩ base resistor in a common-emitter confiduration should work. Add a diode (1N4001 or equiv.) across the coil with the cathode to +12v and the anode to the transistor's collector. HI out = relay ON.

Ken

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6th April 2008, 10:47 PM	(permalink)
KMoffett	Do you know the coil current or coil resistance for the 12v relays?...this will help choosing the right transistor. Ken __________________ "To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931)

7th April 2008, 12:35 PM	(permalink)
KMoffett	A 2N3904 with a 2.2KΩ base resistor in a common-emitter confiduration should work. Add a diode (1N4001 or equiv.) across the coil with the cathode to +12v and the anode to the transistor's collector. HI out = relay ON. Ken __________________ "To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931)