Can a radio have 10 parts or less? Yes maybe. Detector radios are very simple. They run on radio waves, without batteries. The parts they need are very cheap or can be found in old technology. But detector radios are of low power and only receive one station. But such a device is very good in the country, where it is difficult to buy batteries or there are problems with electricity.
Necessary
- • fixed capacitor 190-500 PF;
- • capacitor 2000 - 1000 PF;
- • any diode (light does not fit);
- • copper wire with a diameter of 1-0.1 mm;
- • a cylinder 10 cm in diameter (it can be a tin can);
- • newspaper;
- • metal pin, 30 cm long;
- • a speaker of a small size, for example, from a rotary telephone.
Instructions
Step 1
Look at the diagram of Oganov's radio receiver (detector).
Step 2
Start with grounding. To do this, drive a metal pin into the ground, attaching a wire to it in advance. The better you make the ground, the better the signal reception will be. Lead the end of the ground into the house and attach it to the terminal of the receiver. Make a copper wire antenna. Its length is from 2 to 10 meters. If the antenna height is 10 meters, then one station will be heard, but loudly, if the height is up to 3 meters, several stations can be caught, but the sound quality will be poor.
Step 3
Next, a coil is made. It consists of two identical parts, each with 20 turns (for medium waves). Use a 20 cm can for the coil. Wrap newspaper in advance. Then carefully, coil to coil, wind the copper wire. Leave 5cm of wire between the 2 spool pieces and 5cm in and out. Then, along the turns, wrap the coil in two layers with electrical tape. Now you can take out the can and newspaper and wrap the coil across.
Step 4
Strip all parts and solder them together. Attach coil, ground, antenna, headphones.
If you make a coil of thicker wire, you can tune the receiver to a different frequency. To make the tuning, you need to move one part of the coil relative to the other part using capacitors (variables). How your receiver will look like is a matter of your imagination. Any container will come in handy.
