Two-tone electronic doorbell 1


Posted on Feb 5, 2014

The two-tone electronic doorbell circuit is composed of the input trigger circuit and audio output circuit, ans it is shown in Figure 3-107. The input trigger circuit is composed of the doorbell button S, transistor V1, resistors Rl-R3, capacitor Cl and dual D flip-flop integrated circuit ICl (Al, A2). Audio output circuit consists of the audio output circui..


Two-tone electronic doorbell 1
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