Aman bharti Posted June 30, 2018 Report Share Posted June 30, 2018 click here for full explanation Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 2, 2018 Report Share Posted July 2, 2018 The datasheet of a CD4017B shows that its output current into a 2V LED when it has a 5V supply is only 3.5mA or less (looks dim). Your circuit is mixing an old TTL 555 with an output voltage fairly low with a Cmos 4017 that needs a fairly high clock input voltage. A bad mix. I used a 74HC4017 (high current Cmos) clocked with a Cmos 555 and it makes very bright LEDs and since they are both Cmos they work together reliably. Quote Link to comment Share on other sites More sharing options...
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