>Using multiple 60 degree transducers, each with > its own receive preamp and discriminator, would work nicely except you'd > need 18 of them to give full coverage of a sphere. I think it takes 20, the number of faces on a icosahedron. ~ Bob Ammerman RAm Systems > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf > Of Bob Blick > Sent: Monday, January 04, 2016 2:05 PM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Transducer and driver >=20 > > > It sounds like you are asking for two different things. First you > > > asked for a sonar transducer and then later a circuit. > > > > Well, I took it that the second was to drive the first. > > > > The electronics is fairly basic, a gated oscillator, and a receiver > > that then listens to the transducer a moment after the transmit ends. > > The receiver will normally have some form of AGC so it gets more > > sensitive over time to pick up the further away echos. > > > > You won't get a 360 degree transducer. The only way you would do this > > is to have multiple transducers. It would be useful to have individual > > receivers for each transducer. >=20 > Either way it's not going to be easy. Before designing any circuit, you need to > have the transducer problem figured out. If you can get a 360 degree > transducer, it's going to take a whole lot more drive, and amplifier > signal/noise ratio is a problem because it will produce a lot less echo signal > than a 60 degree transducer.=20 > Friendly regards, Bob >=20 >=20 > -- > http://www.fastmail.com - Faster than the air-speed velocity of an > unladen european swallow >=20 > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .