Published:2011/10/21 2:05:00 Author:Rebekka | Keyword: Two-way telephone password device | From:SeekIC
Two-way telephone password device is shown as above, the two-way telephone device is composed of the power circuit, password circuit, * circuit, and self-locking circuit. Password circuit is composed of digital keys 0 to 9, four password set. The figure is set to 4269. The *circuit is composed offour one-way thyristor SCR1 ~ SCR4, three capacitors C2, C3, C4, resistor R4, R5 and diode D3. Self-locking circuit is composed of infrared light emitting diodes D5, D6, infrared receiver, the resistance of transistor BG R7, R8 and diode D4. The 2 ends of LINa, LINb Access an outside line. TELa, TELb pick connect the phone.
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