Politely welcoming electronic doorbell


Posted on Feb 6, 2014

The politely welcoming electronic doorbell circuit is composed of the trigger control circuit, audio amplifier output circuit, music circuit, voice delay control circuit, and it is shown in Figure 3-122. Trigger control circuit is composed of the doorbell button S, magnetic switches SA, transistors V4, V5, resistors R3, R4, R6, diodes VD2, VD3, and capacitor..


Politely welcoming electronic doorbell
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    HI-FI Stereo Encoder / Multiplexer
    Cable Tester Circuit
    Fm Stereo Transmitter Circuit
    Regentonmeter
    Oscillator DesignGuide Reference
    decibel meter circuit
    Series Inductor Filter
    Speed control for PCB drill
    Replacing Motorola Batteries
    Kapanadze 6



    Top