BadElvis
Newbie level 4
Hi,
I would like to build a small FM transmitter to transmit an audio signal with my notebook. I will power it with a 9V battery. The plan is to connect notebook and the transmitter with 3.5 mm TRS plugs. Some TRS sockets include 2 normally closed contacts, that are opened when a TRS connector is plugged in. Is it possible to use one of these contacts to switch on the transmitter? That would be a nice feature - it gets turned on as soon as a audio source is connected. But I am unsure how to do the wiring. How can I do it? How can I make sure my audio output (notebook) does not take damage? Do I need a transistor as a switch?
Thanks for your replies!
I would like to build a small FM transmitter to transmit an audio signal with my notebook. I will power it with a 9V battery. The plan is to connect notebook and the transmitter with 3.5 mm TRS plugs. Some TRS sockets include 2 normally closed contacts, that are opened when a TRS connector is plugged in. Is it possible to use one of these contacts to switch on the transmitter? That would be a nice feature - it gets turned on as soon as a audio source is connected. But I am unsure how to do the wiring. How can I do it? How can I make sure my audio output (notebook) does not take damage? Do I need a transistor as a switch?
Thanks for your replies!