Simple Ultrasound AM Receiver
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The receiver below is really too sensitive. The noise generated by the first op-amp is noticeable and limits the performance of the whole receiver. Also with the gain turned up it becomes unstable. Try leaving out one of the op-amp preamplifiers.
The circuit consists of ...
Increasing the Range
Find two disused satellite dishes. The mesh ones work as long as the holes are a lot smaller than 8.25mm. Mount the sender and receiver at the dish focal points and see how far you can get the signal.
This screen shot came from a student ELEC6 project to make an ultrasound AM transmitter.
The receiver above picked up this image, fairly free of noise and the colours are rendered well.
The audio spectrum of the received image can be seen on the right.
The transmit and receive software was Digital Master 780 which is part of the Ham Radio Deluxe suite.
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