It’s very simple to make an AM radio receiver with help of just a few electrical components. Electronics video tutorial services can lead you with grace, through the easy steps of building a radio at home. First know how the basic gears work inside a radio.
- An antenna can catch electromagnetic waves from the air and turn them into electrical signals
- A tuner to point out the specific carrier frequency—which corresponds to the radio-station that you want to tune to.
- A diode or detector that avoids high-frequency signals. But grabs low-frequency ones.
- After the detector catches the signal, an amplifier is required to enhance the signal.
- A speaker in the radio is the one where sound comes from.
Now let’s get down to free electronics tutorials to the Steps to build a Radio
- First collect the materials vitally important, as mentioned above.
For building antenna, a piece of wires required, long enough to catch signals. The ideal length of the antenna wire should be 50 feet. But you can also do with a smaller one. Hang a coil (5 inch high) around a plastic tube and now attach the wire to the coil.
- A wire coil here can be used as “inductor”. Now in order to build a circuit that tosses away all unnecessary, hullabaloo signals, you have to combine the inductor with a ‘capacitor’. This circuit can be marked as a ‘resonator’ now.
- Now what the resonator does it to resonate on a frequency which depends on the indictor’s size. Unit of inductance is ‘henries’ and capacitance unit is ‘farads’.
- Tuner coil can have 200 turns. One red insulation strip will mark it. The insulation scuffed on the top. To build the tuner, you can get a brass thin strip which will have one contact at end to generate electrical contact next to different point tagging with coil—at the point of insulation.
- The brass strip should wrap around a screw, the contact slide athwart the coil, altering inductance. Near contact will make inductance small, the circuit plays to high-frequency radio-station. When contact tilts to other end. It lowers the inductance and it plays radio station with low frequency.
- The diode or detector allows electricity to flow in one way. But prevents from flowing in opposite direction. “germanium” detector resembles a teeny-weeny glass cylinder.
- Speakers are the source of sound. Online electronics video tutorial services illustrate how the speakers absorb the electrical signal and a small electromagnet inside helps a plastic paper flutter from side to side, generating the sound coming out of it. Use a small speaker like you see in a portable radio.