| And then suddenly it arrived – Spring 2020. Despite the corona crisis and lockdown measures, spring will not be contained, and just as well....
All items tagged with ultrasonic and Circuit (4)
| Legions of dog whistles are available from pet shops and by mail order. But with only a few parts you can easily build one that yourself!
| This circuit adjusts the gain of (small) input signals such that the amplitude of the output signal is constant over a wide range. The contr...
| Here’s a novel way of listening to bats over the Summer. Put the receiver — powered by four AA (R6) cells — on a window-ledge, for example,...