New lower price for Axon II ($78) and Axon Mote ($58).
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sonars are very costly to buy besides it is not available at the place where i live so i was deciding of making one
sonar is more trustworthy than ir can u plzz tell the schematic??
sonar is better than sharp IR in many ways dont u think
i wanna know if there are any schematics for making ur own sonar using the ultrasonic receiver and transmitter pair
Plain transistors ... In the I-net I saw only one schematic with three-stage bipolar amplifier in receiver curcuit, all others used opamps. Perhaps, this is a trade-off between place economy and noise immunity, but I am not sure. Could you tell ,which opamps had you used? And had you used AC coupling with suitable cut-off freequency? Had you rectified signal? What the gain was? I saw oscillograms where high niose was declared at the output of sonar, but it was not told to be connected with opamps, that is why I am asking. In theory, after rectificatrion and filtering ( just getting envelope of the sent pulse of 7-9 square waves), high-freequency noise should be suppresed. Perhaps, one amplification stage with high slew-rate and GBW and low noise will work. It is interesting for me because I am planning to build USRF and getting info around the net.