Digital lock 4

  
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The digital lock circuit is composed of the timing trigger circuit, trick lock circuit, sound and alarm circuit and control implementation circuit, and it is shown in Figure 3-101. Timing trigger circuit is composed of the transistors Vl, V2, resistors Rl-R4, light-emitting diode VL and capacitor C. The trick lock circuit is composed of the password button..
Digital lock 4 - schematic




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