MK414 SW Receiver


Posted on Feb 7, 2014

The original data sheet for the MK414 states a maximum working frequency is around 4 MHz. SW transmissions are so powerful that this receiver will work well with signals up to about 6 or 7 MHz. The 10k resistor controls the operating voltage for the IC which is critical for good performance. The tuned circuit consists of a variable capacitor and f


MK414 SW Receiver
Click here to download the full size of the above Circuit.

ixed air spaced coil. For the coil, I wound between 10 and 20 turns of wire on an empty tube of around 1. 5 inches diameter. The turns were spaced so that the overall length was around 3 inches. The variable capacitor tuned 0 - 300 pF but there is plenty of scope for experiment here. One final point, you will need an external antenna to receive broadcasts. I have an outside wire that is about 7 meters long and this was quite effective. The antenna can be connected at either end of the coil or via a series capacitor value between 10pF and 100pF.





Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    high input voltage regulators using lm340
    gold detector schematic
    isolated ac current monitor
    Constant Voltage Speaker Measurement Circuit
    Field circuit diagram of the needle
    Homemade small telephone PBX circuit diagram



    Top