14 Threads found on edaboard.com: How To Use uln2803 With Relay
See the circuit. I want to drive uln2803 with 5 volt signal on 1b input, The Vcc is 12 volt. But he 1C ouptut is two low to drive the
PCB Routing Schematic Layout software and Simulation :: 31.05.2010 12:47 :: imani9009 :: Replies: 2 :: Views: 12375
What do you know about the control of relay. I have a transistor to be control the relay.how control?
Analog Circuit Design :: 11.08.2004 00:37 :: LAKMON :: Replies: 2 :: Views: 832
i want to interfcae relay with MCU.
i have 12v relay which has five legs.
so i am confused how do connections in circuit.
how to give supply to relay.??
which legs will connect with MCU.??
which legs will connect to the load..??
i am (...)
Microcontrollers :: 23.02.2008 00:45 :: H_D_R :: Replies: 22 :: Views: 3128
Suppose I want to drive a 0.5A load with my PIC . Somehow the PIC decedes to open a valve ie. Should I use relay or just a n amplifier? how much current can I get from PIC? ( small I guess).
Professional Hardware and Electronics Design :: 25.01.2005 03:24 :: dkace :: Replies: 7 :: Views: 2127
If you still need this relay to be driven by "L"-ow signal on the micro's pin - below is an example on how to do this ..
Microcontrollers :: 17.07.2006 21:17 :: IanP :: Replies: 6 :: Views: 8474
how many LED's do you want to Turn ON?
P1, P2 & P3 have internal 10k pullup resistors so the max o/p current will be 5v/10k=0.5ma (assuming 5v supply) but u can connect the anode to the Vcc & the cathode to the Port pin using a resistor. Under stady cndition 89s52 pin can sink 10ma current which is sufficient to turn ON a LED.
Check the following
Professional Hardware and Electronics Design :: 15.07.2008 05:50 :: amol_shah :: Replies: 3 :: Views: 4822
8051 microcontroller hardware interfacing tutorials circuits schematics assembly C language programming - i/o ports on 8051 port
See how to connect relay and appliance with uln2003 : 8051 Microcontroller Projects AVR PIC Projects Tutorial
Electronic Elementary Questions :: 09.01.2011 10:44 :: ckshivaram :: Replies: 4 :: Views: 800
im using a 5v buzzer in my circuit. i want to interface this buzzer to a uln2803 relay driver so that it can power my buzzer. but i do not know how to do this. im taking pin 1b of the uln2803 to the p1.2 of the 8051 and am connecting the buzzer to pin 1c of the uln2803. (...)
Embedded Systems and Real-Time OS :: 27.10.2011 10:19 :: natasie :: Replies: 3 :: Views: 3175
how is your snubber ?
Single 100nF or 220nF usualy solves this problem.
Analog Circuit Design :: 10.01.2004 16:39 :: bunalmis :: Replies: 5 :: Views: 2664
what is the max rating of the relay contacts V/A?
what exaclty is the kind of noise? how is it effecting your circuits? is there a glitch in the power lines? or is it reseting your controllers/circuit? what exaclty/
could you post the schematics,if you have readily.
Microcontrollers :: 10.02.2009 23:47 :: cameo_2007 :: Replies: 14 :: Views: 8714
Hi all ,
I want to protect uln2803 (NPN Array Transistors , Active Low) and UDN2981(PNP Array Transistors , Active High) , how could I do that ?
The board I'm designing is a tester so I don't know what is going to happen ,
Maybe just for a simple mistake in assembling the parts , ULN & UDN see unexpected voltages at their outputs . I can't us
Electronic Elementary Questions :: 09.12.2011 05:33 :: LOSTISLAND :: Replies: 3 :: Views: 699
If we want to control our a high voltage system or big mechanical devices, electric motors by using microcontrollers or PCs., how must we design it so we can protect our low voltage microcontroller based boards.
I am trying to learn is there a specific(or conceptual) name that i can look up whose job is making "safe" bridge between high v
Microcontrollers :: 04.09.2009 04:32 :: rotorcli :: Replies: 8 :: Views: 3104
relay part is the easy one, but how are you going to sense the direction of the motor ..
Usually it is done with a 2-wave rotary encoder somehow driven by the motor’s shaft ..
Analog Circuit Design :: 15.04.2010 06:55 :: IanP :: Replies: 3 :: Views: 668
i make a board with micro avr+uln2803+relay 12v+chracter lcd20*4+(conductor220vac)
i control conductor with relays(220vac is on relay's contacts that control conductor)
when i on or off relay with micro&uln2803 strange letters apears on (...)
Microcontrollers :: 05.04.2011 16:05 :: bbd556 :: Replies: 7 :: Views: 807