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Two-tone electronic doorbell 1

2014-11-23 22:50  
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Two-tone electronic doorbell 1
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 circuit integrated circuit IC2, capacitor C2, resistors R4, R5, transistor V2 and speaker BL. Rl-R5 select the l/8W or 1/4W carbon film resistors. Cl and C2 select the aluminum electrolytic capacitors with voltage in lOV. Vl uses the S9014 or 3DGl2 silicon NPN transistor; V2 uses Sg013 or S8050 silicon NPN transistor.