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I remember having to learn that one the hard way too. Usually when I can't get something to work righ I break it down into smaller sections and make use of a multimeter to help trouble shoot.
Glad to hear you got it working. Have fun building it with your kids.
The second circuit needs to stay. However you can replace the LED with a wire.
Shouldn't be a problem, as long as you have enogh voltage to drive the LEDs.
Build a super-simple blinking led / oscillator on your protoboard in under a minute!
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