Baby wet alarm circuit (1)
Source: InternetPublisher:newrudeman Keywords: Alarm circuit BSP transistor speaker Updated: 2020/03/31
Circuit working principle: VT66A-S21 is a 3-pin integrated block that stores single-tone music
. Its appearance is similar to an ordinary plastic triode . VT66A-S21 has a power amplification
circuit inside and has enough output power to directly drive 8 Ω and 0 . 25-inch speaker plays sound.
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