I am using the button in an automotive application (12 volts) to trigger a relay. I would like to use a Piezo touch switch with an LED indicator to trigger a transistor which will in turn power a relay. I have a circuit built to trigger the relay for ½ a second with a 20ms or greater pulse of the piezo switch. However the 2 volts across the piezo LED is presenting problems. Do you have a circuit with any of you piezo switches that might show how to setup this sort of circuit?