multivibrator With values \u200b\u200bshown in the schematic frequency of the alternating flashing LEDs is approximately 1 Hz. The system is susceptible to experiment: change the values \u200b\u200bof resistors and electrolytic capacitors will change the frequency - with tens of nF capacitor circuit generates a frequency acoustic. Multivibrator can control the buzzer (instead of the diode) or the loudspeaker (headphones). Instead of 10k resistor can be used photoresistor - the system will be sensitive to changing light intensity.
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