Two-tone electronic doorbell 2

Published:2011/8/9 22:32:00 Author:Ecco | Keyword: Two-tone electronic doorbell | From:SeekIC

The two-tone electronic doorbell circuit is composed of the trigger control circuit and doorbell generating circuit, and it is shown in Figure 3-108. Trigger control circuit consists of doorbell button S, resistors Rl-R3, electrical wear devices Cl-C3, diodes VDl-VD3, six NOT gate integrated circuit ICl (Dl-D6) and the electronic switch IC lC3 (S1, S2). Doorbell generating circuit consists of the resistors R4-R6, audio IC lC2, capacitor C4, transistor V, and speaker BL. Rl-R6 select the 1/4W metal film resistors or carbon film resistors. Cl-C4 select the aluminum electrolytic capacitors with voltage value being greater than 6V. VDl-VD3 use the 1N4148 silicon switch diodes.



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