Circuit detecting extremely fast or slow movements - has pre-amplifier followed by inverters, two monoflops and LED display unit

摘要

The movements are detected in the vicinity of transducers of an ultrasonic movement detector. A preamplifier with a variable amplifier is connected to the output of the transducers. Its output is connected through a differentiating circuit and a pulse amplifier to two invertors whose output is connected to two 1:10 counters with tappings. A first monostable flip-flop is connected to the amplifier output, connected to the resetting inputs of the counters. The first monoflop is connected to a secnd whose operating time is three times longer than that of the first monoflop. An invertor and a LED display unit is at the counter output.