This experiment is using the same basic oscillator circuit introduced in experiment #28. But, the oscillator's resistance is electronically varying. The 1,000,000 ohm resistor and 10 microfarad capacitor slowly increase the base voltage (base current) on the transistor (NPN-Left). As the base current slowly increases the collector current (NPN-left) also increases slowly. The transistor (NPN-left) is now limiting the current just as a resistor does. When the switch is turned off, a similar effect occurs as the 10 microfarad capacitor slowly discharges. Note: I short the capacitor at the end to silents the siren.
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