I'm a little in over my head right now. I'm almost finished with the recirculating heater I'm working on but I'm having trouble with the 12v relays causing blanking of the small character LCD when they open. I've read this is a common issue with the LCDs and that I need snubber circuits across the relay coils. I've try different combinations and a .1uf capacitor and 47ohm resistor seem to have made a small differance but the issue is still definitely there.
How can I calculate the correct resistor and capacitor combination? If I can't get this right is there another way around this? Could solid state relays be a solution?