555 static low power dual tone door flute circuit

Published:2011/6/3 8:44:00 Author:nelly | Keyword: static, lower power, dual tone, | From:SeekIC

Generally, the power consumption is large by taking the bipolar 555 as the doorbell. As shown on the figure 11-15, the circuit's static power is about 250µA before the AN is turned on. Turn on the AN, C2 will be charged by the D2. When the four foot is larger than 1v, the multivibrator which consists of 555 and R2, R3, C4 will be onset. The oscillation frequency is about 1000Hz. Turn off the AN, the oscillation frequency will be lower because the C5 and C4 is parallel connecting. It's about 700Hz, so we call it dual tone



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