im making a 3 input, two output audio switcher with headphone(1.8mm) style jacks. i will be able to switch between the three inputs(computer, stereo FM, auxilary), and then send the selected input to eaither a audio amp or headphones. so i need a DP3T relay for the inputs(DP for Left and right audio, GNDs are all interconnected and 3T for the three different inputs). then a DPDT to switch the selected audio in to either headphone or the amp.
i cant find these types of relays, where can i find them? i can find physical switches like this though...
A triple-throw relay would be a very rare thing. It would be cheaper to cascade two double-throw relays. Connect the outputs of one relay to one of the two inputs of the second relay. That gives you three inputs and one output.
It really looks like you need 3 relays for the inputs, single relay for output. the 3 input relays would let you select 1 of 3 sources, and the 1 output relay would let you select 1 of 2 outputs. (a relay has Normally Closed and Normally Open contacts) the normally closed contact could be the headphones, the normally open the amp.