The circuit uses a 555 timer oscillator to supply clock pulses of a variable frequency to the 4017 decade counter. The decade counter only needs to have three outputs so the fourth output goes into the reset pin to start the cycle all over again. The central red led is always on. Each row of [...]
It works on the sonar principle, sending an ultrasound burst and listening for first echo. The burst generated by the oscillator built around U4D (you must set the frequency using TR2 to have 40 kHz or the maximum sensitivity), U4E buffers the output and U4F boost the signal doubling the voltage span across the TX [...]
The following CD4017 circuits have not been tested and is presented here as a possibility only. If you experiment with this circuit please send me any problems found so that the circuit can be updated. The following circuits are designed to change the duration of each positive output pulse from the astable timer. The circuits [...]
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