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Optical electronic doorbell 2

2014-11-18 09:39  
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Optical electronic doorbell 2
The optical electronic doorbell circuit is composed of the power supply circuit, oscillator circuit, music generating circuit and color bulb control circuit and other components, and it is shown in Figure 3-112. Power supply circuit consists of the power transformer T, bridge rectifier UR and filter capacitor CI. Oscillator circuit consists of the time-base integrated circuit IC2 and external RC components. Music generating circuit consists of the button S, music integrated circuit ICl, transistor Vl, speaker BL and resistor Rl, capacitor C2 and so on. Color bulb control circuit consists of lantern lights HL1-HL3, two-way thyristor VT, transistor V2 and relay K and other components. Rl-R4 select the 1/4W or 1/8W carbon film resistors.