I am trying to figure out an alternative to a household dimmer switch. I need to be able to electronically control the output voltage on a 120v circuit. Any suggestions? Currently I am using a manual light dimmer switch but I would like to be able to us an electronic signal from a computer to raise and lower the voltage output on the circuit. Cheaply and reliably would be ideal. I don't need minute adjustments just like 1 volt incriminates should be fine.