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9 Threads found on edaboard.com: uln2803 12v
An integrated driver like uln2803 would be fine to control 15V relays from 5V logic, or single transistors with base series resistors and flyback diodes. You'll find pretty much relay driver examples in Edaboard discussions.
Hello all i used 1 atmega16 through 2 uln2803 driver to 4 unipolar stepper motor and wrote a code to control the direction of the motors. the problem here is the speed and the torque of the motors are too low. the power supply used for the motors is 12v 1A adaptive power supply. how to accelerate motors and increase
U3 COM pin should connect to the same supply as the relays (+12v) not +5V. What is happening is the diodes internal to the uln2803 are allowing some current to flow through the relays even when they are not supposed to be energized. The relay voltage is changing from 12v when energised to 7V when not energized. That's borderline on being (...)
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 lcd when number of conductor increase this strange letter increase too but the program on micro (...)
yesuln2803+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 lcd when number of conductor increase this strange letter increase too but the (...)
all time i use relay more than 5volts,i use uln2803,you can drive 12,24v,etc and you have a free wheelling diode pin (10),you can parralell output to draw more current(bigger relay),cost only .75 cents.
hI, From My SBC Board supply of +3v is coming and External Device need 12votl supply can I use uln2803 between board and device as a Voltage convertor??
Hi, anyone can help me how to use uln2803 to drive Relay. I use uln2803A and my coil relay is 12vDC. COM on the pin no 9 should be connected to 12v or 5v? and uln2803 doesn't have VCC pin. Please help me if possible in a diagram. thx
Hi all, I'm using a uln2803 in SO18 package. Need to use ULN2805 instead (3.3VDC). Does anyone know where I can find it ? Or any better idea to drive 8x 12v relays with 3.3VDC. /Regards BEA