RAILROAD CROSSING LIGHTS CIRCUIT

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1.
This circuit has two lights called ___________ .
2.
This circuit uses a 555 _____________ circuit.
3.
LED #2 in this circuit is _______________ -BIASED.
4.
LED #1 in this circuit is FORWARD-_____________ .
5.
The blink rate of the LEDs can be _________________ by changing the values of R1, R2, and C1.
6.
Two cycles or blinks per second is the same as two __________ .
7.
The 555 Integrated circuit is working as a ___________ in this circuit.
8.
When Pin 3 on the 555 is ____________________, LED #2 will light up.
9.
When Pin 3 on the 555 is __________________ , LED #1 will light up.
10.
An LED has two leads. One is called the CATHODE (negative) and the other is called the ____________ (positive).