Recording control circuit for visitor interphone
A control circuit and walkie-talkie technology, applied in negative feedback circuit layout, telephone communication, electrical components, etc., can solve problems such as inappropriateness, increased communication costs, and inconvenient visitors, etc., and achieves a strong practical effect
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[0010] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0011] see figure 1 , in an embodiment of the present invention, a recording control circuit for a visitor walkie-talkie, including an electret Y, a capacitor C1, a potentiometer RP1, a triode VT1, an operational amplifier U1, and a key switch SB, and one end of the electret Y is connected to a capacitor C1 and one end of potentiometer RP1, the other end of potentiometer RP1 is respectively connected to the other end of electret Y and the other end of capacito...
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