OK so I got this FM transmitter for use in my car which is designed to hook into the main 12V line of the car. I found a 12V line under the seat that I wanted to use, and decided also to install a switch with led indicator to turn it on and off and show when it was on/off. Anywho, my current knowledge of circuits only let me to come up with a circuit that doesn't work.
Here's a pic of the circuit (I dont have a drawing prog and I madde this really fast but this is what it is.) (edit: the box thing is the transmitter)
**broken link removed**
I'm sure you're laughing because the resistor lowers the current too much for the transmitter to work but yea... I can't figure out how to do it.
(the resistor is 470 ohm and the led is a normal led im using a 3v forward voltage and it runs off 20 mA)
The possible solutions I thought of were:
-get a seperate source for the led and hook it up using a DPDT switch (but I would really prefer to do this with one circuit)
-use transistors to boost current? I don't relaly know how to calculate this or anything though.
Please help! thank you so much.
Here's a pic of the circuit (I dont have a drawing prog and I madde this really fast but this is what it is.) (edit: the box thing is the transmitter)
**broken link removed**
I'm sure you're laughing because the resistor lowers the current too much for the transmitter to work but yea... I can't figure out how to do it.
(the resistor is 470 ohm and the led is a normal led im using a 3v forward voltage and it runs off 20 mA)
The possible solutions I thought of were:
-get a seperate source for the led and hook it up using a DPDT switch (but I would really prefer to do this with one circuit)
-use transistors to boost current? I don't relaly know how to calculate this or anything though.
Please help! thank you so much.