roveydoveygrovey

ok thanks for the help and suggestions very much appreciated , if i ever get one working i'll let you know.

nice one thanks for the reply. glad i asked, probably would have spent ages trying to get it to work. Im pretty new to this, so you're saying i should look for a circuit that uses FM modulated ultrasonic carrier?

I was looking at the Infrared cordless Headphone Amplifier project to build, from this page - http://www.electronics-lab.com/projects/audio/016/index.html The only part of the circuit that I couldn't make sense of is the audio input in Fig 1. There's something that looks like a transformer, but there are no values given for windings or inputs/outputs. Can anyone explain what's going on here? Also has anyone built this? did it work? I really appreciate any help, Thanks