As shown in the figure, the electronic model consists of two sounding circuits, each consisting of a photoelectric sensor head, a 555 and a voice circuit.
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The
general wiring methods for this Transformer Connector Shield includes clamp
type and terminal type. The users make orders according to the
transformer inlet and outlet lines.
Features:
1.Suitable for 1-35KV.
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The photoelectric sensor head adopts 3DU type photosensitive tube. When the guest exits the entrance port, the light of the VT1 (or vT3) is blocked, the photosensitive tube is high impedance, and the potential of the 555 2 feet is less than 1/3Vdd trigger level, then IC1 ( Or IC2) is set, the output is high, so that IC3 (NS5603) is triggered, and the voice of "Welcome" is issued. At the same time, VT2 is turned on, and the low potential of its collector is applied to pin 4 of IC2, which will force reset 555 regardless of whether VT3 has illumination.
2.Radiation cross linking materials (Polyolefin or EPDM rubber ).
3.Quick and easy installation.
4.Avoid short circuit and leakage.
5.Facilitate routine inspection and maintenance.
6.Resistant to moisture and dust.
7.Meet RoHS Stand.
8.Customized.