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

    High-power battery-operated flasher
    Sample-and-hold circuit
    Protection For Telephone Line Circuit
    Circuit to convert a voltage output of a Hall device to a current
    Car Battery Saver Circuit
    lie detector circuit diagram
    30 volts panel volt meter using pic mcu
    led workbench lighting
    4 Watt FM Transmitter
    Battery Replacement Power Supply
    A simple project with AT90S2313



    Top