Three-tone electronic doorbell 1


Posted on Feb 5, 2014

The three-tone electronic doorbell circuit consists of buttons Sl-S3, transistors Vl, V2, speaker BL, resistors Rl-R3, capacitors Cl, C2, diode VD and battery GB, and it is shown in Figure 3-109. Rl-R3 use the 1/4W carbon film resistors or metal film resistors. Cl uses the electrolytic capacitor with voltage in 16V; C2 uses the monolithic capacito


Three-tone electronic doorbell 1
Click here to download the full size of the above Circuit.

rs or polyester capacitors. VD uses the 2AP9 germanium ordinary diode or 1N4148 silicon switching diode. Vl uses the 3DG6 or S9013 silicon NPN transistor; V2 uses the 3AX31 germanium PNP transistor.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    SCA decoder
    Headlight delay unit
    Polarity converter
    Low-pass filter
    Automobile-air-conditioner
    85% efficiency SMPS circuit
    Electric Guitar/Violin Preamplifier
    DC-Coupled Audio Amplifier Circuit
    Rustl3rs Custom Smart LED Light
    Dual 25W stereo audio power amplifier circuit
    Double tube fluorescent emergency circuit 2



    Top