for a project in which I must switch a number of lamps according to some timing plus start and stop a VMUSIC2 device I have soldered myself a PCB which has 18 relais on it, each driven by a 5V darlington array IC (ULN2003 if I am not mistaken) which itself is connected to 18 digital outs of a seeduino mega (think: Arduino Mega - 20% price :). Now, it all works, but the noise the relays make drive me nuts.
Is there a way I can use MOSFET transistors instead of the relays?
I have the arduino's usual TTL level outs and need to switch 12VDC/1A (Halogen lamps) and 24VDC/ca. 100mA (LED panels). It is my understanding that MOSFETS can only switch +-20V of "difference" between the switching-signal and the switched line?!?
Thanks in advance for any help, Christian.