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Three-tone electronic doorbell 2

2014-11-22 06:00  
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Three-tone electronic doorbell 2
The three-tone electronic doorbell circuit consists of the coding triggered circuit, multi-tone generator and audio amplifier circuit, and it is shown in Figure 3-110. Coding trigger circuit is composed of the buttons Sl-S6, two four-input AND gate (DI, D2) integrated circuit ICI, resistors Rl-Rll and transistors Vl-V3 and so on. Multi-tone sound generator circuit consists of the train sound analog integrated circuit IC2, LEDs VLl and VL2 and resistors R13-Rl5. Audio amplifier circuit consists of audio amplifier tube V4 and speaker BL. Rl-Rl5 use the 1/4W or 1/8W carbon film resistors.