I wanted to learn about opamps and came across this schematic... http://www.eeweb.com/blog/extreme_circuits/a-very-simple-led-tester
I have a number of questions about this:
In his description he talks about R2, I didn't see this or am I going nuts?
I understand the capacitor symbol but whats the single bar just below it? Also appears on the other side of the circuit.
I think the answer to both of these will probably help me to understand exactly how this all works.