Aman bharti
- Apr 11, 2018
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LED Blinker/Flasher Circuit using bicolour led
- Thread starter Aman bharti
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audioguru2
- Apr 6, 2004
- 12,026
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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.
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.
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