Let's Make Robots!
'Turns' when it bumps into something (quotes are intentional see extended comments)
Using a
This robot was built more to prove to myself that I could do it than anything else. More on that further down after some specs. EDIT: I used to be slightly ashamed … Read more

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?

My latest project isn't much of a robot in the traditional sense. That is it has virtually no moving parts. It will all told in fact have 1 single linear actuator. … Read more