Like UTP cable tester for RJ45 Ethernet networks that is posted on this blog, this is the difference that requires no MCU or firmware, is developed with conventional digital electronics.
is a testing tool for UTP Level 5 and RJ45 connectors in order to test the pairs for the ethernet standard.
circuit is nothing but developed based sequencer to 4017 whose main function to create a consecutive sequence of sweep between the 8 bit, which varies its speed to 555 by the potentiometer.
The only control you have this tester is the frequency adjustment, which can be done with a common potentiometer or with a preset to shrink.
The circuit is as follows:
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