logicnibble
New Member
Hi!
I'm designing a uC circuit which uses AC power: a simple transformer + diode bridge + capacitor + LM317 (3.3V).
I have some input connectors where it's supposed to read analog voltage and I want to protect them from ESD. For that I have thought using pcb spark gaps.
(see ESD and EMI protection in PCB Layout)
Since the spark gap is supposed to be connected to earth, Can I connect circuit ground to earth? That is, connect the reference from LM317 to earth from the mains plug?
I'm designing a uC circuit which uses AC power: a simple transformer + diode bridge + capacitor + LM317 (3.3V).
I have some input connectors where it's supposed to read analog voltage and I want to protect them from ESD. For that I have thought using pcb spark gaps.
(see ESD and EMI protection in PCB Layout)
Since the spark gap is supposed to be connected to earth, Can I connect circuit ground to earth? That is, connect the reference from LM317 to earth from the mains plug?