Can AC and DC voltages be on the same pcb ?

[auto_mitch]

AC and DC on a pcb

Hi everyone!
I have built a control unit with an mcu which drives a few relays. The relays's contacts control (ON/OFF) AC devices. The mcu and the relays (24 Vdc) are on the same pcb at the opposite direction. Is that normal, being DC and AC Voltages on the same pcb?
Thanx

 

[rikie_rizza]

AC and DC on a pcb

Its alright as long as you isolate them properly. Use guard ring from DC supply ground to physically splitting the area. Relay is a good isolation device, there shouldn't be any disturbance, especially if you use relay controller circuit.

 

[fsahmed]

Re: AC and DC on a pcb

It would be advisable to keep AC and DC grounds separate