ZN414 Portable AM Receiver circuit and description


Posted on Feb 7, 2014

Designed around the popular ZN414 ic this receiver covers the AM band from 550 - 1600 KHz with the values shown. For Longwave the coil needs to be changed. Use one from an old MW radio to save time. The ZN414 is a tuned radio frequency designed and incorporates several RF stages and an AM detector. It is easily overloaded and the operating voltage


ZN414 Portable AM Receiver circuit and description
Click here to download the full size of the above Circuit.

is critical to achieve good results. The BC107 acts as a voltage follower, the four 1N4148 diodes providing a stable 2. 4V supply. With the 10k pot, which acts as a selectivity control, and the b-e voltage drop of the BC107, the operating voltage for the ZN414 is variable from 0 to 1. 8volts DC. If you live in an area that is permeated with strong radio signals, then the voltage will need to be decreased. I found optimum performance with a supply of around 1. 2 volts. The audio amplifier is built around an inverting 741 op-amp. Extra current boost is provided using the BC109 / BC179 complementary transistor pair. The voltage gain of the complete audio amplifier is around 15. The audio output of the complete receiver is really quite good and free from distortion. I may provide some sound samples later.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Static charge-electricity detector
    Frequency comparator II
    Motor-hour-meter
    Filters
    FM wireless transmitters
    The figure based on LM3S101 adopts the controller to design
    USB Powered Stereo Computer Speaker
    DTMF Decoder Using MT8870
    Ohms Law
    RC oscillator
    CD4520 CD4511 CD4067 digital automatic inspection circuit diagram
    Using reactors buck breeze block circuit



    Top