Many thanks. Im sorry if I was not so clear. I initiated th project by adopting a TV remote control as a shortcut for a transmitter, not realising the implications of it being modulated the way it was. Learnt my lesson on that. Am I correct (still learning) the transmitter circuit you have been good enough to attach is a straight 38khz or whatever generator? So providing a constant frewuency.
I thought the IR receiver device would give a logic output, again learnt a lesson.
I will build your transmitter circuit and give it a try.
The file to use with the LTSpice is all new to me, I will do some reading up.
Just a couple of questions regarding the ciruit, V1 Rserv? is this the supply, and the words tran 0 10 0.1 , is this a drawing number, I'm taking it as being ground.
Many thanks again