I do a project that use amperage amplifier that connect to female that exit an electrical thread to split device that have two relays that every relay need 75 watt to turn on electronics devices one of the two relay need to receive a signal of 5 volt
I use ULN2803 amperage amplifier but the output of this device is opposite in other words if the input is "1" logic the output will be "0" logic with strong amperage
My question is if this disturb if I connect a high amperage 40mA to turn on the relay that give a signal of 5 volt that I need ?
The coil have a resistance of 130 ohm and after calculation I receive that the coil need at least 40mA to turn on
That say that this amperage that depend in the resistant of the coil will give me the 5 volt signal despite of the negative logic ("0" logic) ?
Other question that I have is what is the different between red and black switching diodes