|
Simple AM receiver. Shake the phone to imitate reception.
It is fully functional. I have built it on a breadboard using old components such as soviet KT315Б and МП13Б transistors, but you can use almost any other ones. You will need also a ferrite antenna and a tunable capacitor (from a broken radio, for ex.) for the LC tank at the input, and a compact audio transformer for the output stage (also from an old radio, for ex.). The sensitivity of the receiver is good enough to work without an external antenna, but if you are too far from any station you can add a piece of wire (the longer the better) as is shown in the schematic, and make a real ground.
Before building it measure beta of your transistors and adjust the resistors in the base circuits accordingly! As a rule you should have about 3-6 V CE dc voltage on all transistors, except the last stage where it is close to 9 V.
|
