Thanks to everyone for their input on this. Lots of good ideas, some of which I'm just about capable of carrying out... ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
One of the things I was doing wrong, that I now realise from the forum responses, was that I was just measuring the o/p from the IR sensor using a simple voltmeter. Of course, it seems really obvious now, but I really should have been using my scope. I'll have a go with that over the weekend and see what that shows up.
Anyhow, I am still VERY interested in being able to build a circuit that can filter out the 36KHz frequency being emitted by the IR diode. So far no-one has posted any circuit ideas, or component values that might help me to build this. Yes, I know I can build my detector in other ways, but this stuff really fascinates me, so I am using this 'project' as a learning vehicle.
I'd really love to be able to build a receiver circuit that I could connect my scope to and see a reconstructed waveform, so that if I were sending a 36KHz IR signal, which was turned on and off regularly and which generated a waveform similar to the attached image https://www.electro-tech-online.com/attachments/crotracea-jpg.29674/ then I'd be able to 'see' a very similar waveform appear on my scope attached to the receiver circuit.
Unless I have completely misunderstood the requirements of the receiver, then I reckon all I need is a suitable circuit that can filter out all/most of the other spurious IR signals, and just concentrate on the 36KHz one.
Like I said earlier in the thread, I think it would consist of a simple amplifier followed by a filter (or vice versa).
However, I really don't know how to build the filter, i.e. what components and values to use so that it only passes 36KHz.
Any help in this area would be really appreciated.
One of the things I was doing wrong, that I now realise from the forum responses, was that I was just measuring the o/p from the IR sensor using a simple voltmeter. Of course, it seems really obvious now, but I really should have been using my scope. I'll have a go with that over the weekend and see what that shows up.
Anyhow, I am still VERY interested in being able to build a circuit that can filter out the 36KHz frequency being emitted by the IR diode. So far no-one has posted any circuit ideas, or component values that might help me to build this. Yes, I know I can build my detector in other ways, but this stuff really fascinates me, so I am using this 'project' as a learning vehicle.
I'd really love to be able to build a receiver circuit that I could connect my scope to and see a reconstructed waveform, so that if I were sending a 36KHz IR signal, which was turned on and off regularly and which generated a waveform similar to the attached image https://www.electro-tech-online.com/attachments/crotracea-jpg.29674/ then I'd be able to 'see' a very similar waveform appear on my scope attached to the receiver circuit.
Unless I have completely misunderstood the requirements of the receiver, then I reckon all I need is a suitable circuit that can filter out all/most of the other spurious IR signals, and just concentrate on the 36KHz one.
Like I said earlier in the thread, I think it would consist of a simple amplifier followed by a filter (or vice versa).
However, I really don't know how to build the filter, i.e. what components and values to use so that it only passes 36KHz.
Any help in this area would be really appreciated.