Toy electronic cat circuit (2)
Source: InternetPublisher:失踪的猫 Keywords: switching circuit Updated: 2020/06/29
Circuit working principle: The switching circuit is composed of VT2~VT6, etc. The sound
is converted into an electrical signal by the microphone , amplified by VT1, and then multiplied and rectified by VD1 and VD2 before being added to
the base of VT2. After VT2 is forward biased, it changes from cut-off to conduction, which in turn turns
VT3 and VT4 on.
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