Two-tone electronic doorbell 2

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). Door..

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