I need a basic swtich driven by an audio signal
So I have to drive a coil with about 9 to 12 volts. I have a trigger signal which is basically a sine wave coming out of a cell phone's headphone jack, which I believe should be around 1/2 a volt.
The question is can't I just drive this with a Transistor used as a swtich with a diod attached to the latch pin to cut out the reverse voltage from 1/2 the sine wave to get pulsed DC at high Voltage?
If so, anyone know some transistors I can use? Obviously they need to be rated for the voltage/amperage I'd be working at.
Second. How badly is the pulsed DC going to kill me with the coil due to impedance/back EMF?