I found the following circuit on the internet and made it on the back of a business card as a fun project. The idea is that you ask a question, touch the naked wire, the lights shuffle and you end up with an answer highlighted by the one of the LED's. A poor mans magic 8 ball.
I've just got a couple of questions concerning the circuit:
- What exactly is happening at pin 14? I know that pin 14 cycles through the output pins when the power changes high to low or vice versa, but how is touching the wire achieving this?
- Why does the circuit only work when connected to actual ground or, oddly, when it's not connected to actual ground but near something electrical?
- Finally, is there a way to get this circuit to work without connecting to ground? Or would I need to up the complexity and connect some sort of oscillator like a 555 timer and capacitors?
Thanks for the help.