This be LED display circuit , that interesting. By it will wink to alternate between LED the red and LED the green. This circuit can work with IC LM324, by part of IC op-amp 4 pcs. number LM324 cheap build origin waves square circuit comes out 1 cycle per every second. For LED one by one resistors serial connection stays with LED one by that one be valuable differently, because of requirement Foreard voltage differently. If LED2 stick glowing bright , while again stick ,give enhance the value of R6 a little again. value expansion of R6 too much will go to decrease the brightness of LED2 down go to power supply can use 5V sizes or 6V-9V.
This circuit worked since my son do it happily. see below.
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