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Old Aug 21, 2012, 03:25 AM
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analog BJT magic

Aren't you glad you didn't need to solder that board, but when an LF353 would either cost $20 or take 5 days to order, the easier option is some more epic analog BJT magic.

This one took a while to figure out. The object of the game was to make a comparator out of the fewest transistors. The trick was using the output of 1 side to drive the other side & using an NPN where a PNP would be used in an H bridge.

There was probably a magic search term which would have found the same thing on the goog.

So the next great hope is broadcasting pings from the ground to the aircraft. Initial tests with a single h-bridge driven transducer were promising. The trick is driving 3 transducers with a reasonable circuit, getting the aircraft to know which transducer is pinged & when, getting a ping rate high enough.
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Last edited by Jack Crossfire; Aug 21, 2012 at 03:58 AM.
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