Optical electronic doorbell 1

Published:2011/8/11 20:59:00 Author:Ecco | Keyword: Optical electronic doorbell | From:SeekIC

The optical electronic doorbell circuit is composed of the power supply circuit and light and sound circuit, and it is shown in Figure 3-111. Power supply circuit consists of the doorbell button S, power transformer T, bridge rectifier UR and filter capacitor Cl. Sound and light circuit consists of colored bulb HL, thyristor VT, music integrated circuit IC, resistors Rl-R3, capacitor C2, diode VD, thyristor VT, LED VL and speaker BL. Rl-R3 use 1/4W metal film resistors or carbon film resistors. C2 and C2 select the aluminum electrolytic capacitors with voltage in lOV. VD uses the 1N4148 silicon switch diode.



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