2P2 Electronic Tube Single Light Medium Wave Radio Kit Battery Tube Radio 2P3 Radio Transparent Case Shipped Without Battery

Description

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Type1: 2P2 single lamp radio board all parts

Type2: 2P2 single light board all parts + transparent case

2P2 tube single lamp radio board kit, the magnetic rod coil needs to be wound by yourself!

Adapt to 2P3 chassis. Without case! The case needs to be photographed separately. It also does not contain batteries and speakers cannot be carried.

Important note: If the single tube machine is not connected to the antenna or the power amplifier, the sound is too low! Very impractical!

For a small power amplifier, you can use a Bluetooth speaker with an input cable on a mobile phone or a small computer speaker.

And it can only receive a few strong stations, so this kit is only suitable for DIY enthusiasts.

After the completion, the effect of carrying and listening can not be achieved! Free MP3 headset and 3.5 to 6.5 seats.

Introduction to the kit:

The potentiometer is also a switch and regenerative regulation.

DC battery 14500 lithium battery 3.7V and 9V power supply, the screen voltage is 9V. The screen current is less than 0.5mA.

Filament 2.4 volts power supply: 7 feet are positive, 1 feet are negative, 5 feet are empty. Filament current 30mA.

The low base of the lamp emits red LED 2.4V power supply, current-limiting resistance 150 ohms. LED current 16mA.

After the transformer impedance is transformed, you can listen to it with low-impedance 8-32 ohm headphones.

You can use high-impedance 2000-4000 ohm headphones to listen without the transformer.

Refer to the finished product drawing:

Matching circuit diagram:

The kit is shown in the picture, and the coil should be wound by itself. Primary 3–4 about 85 turns, regeneration 5–6 about 10-30 turns

Excluding chassis, batteries and speakers! The single-tube machine also cannot bring the horn. The 2P3 shell is more expensive and needs to be purchased separately!

Weld the 7-pin tube socket first to ensure that the bottom surface of the tube socket is close to the small plate and is flush. After welding, cut off the protruding welding feet.

When soldering the LED, pay attention to the height when soldering, and the top surface should be flush with the top of the tube socket to have a better luminous decoration effect.

Finally, solder the current-limiting resistor and cut the leads short. At this time, solder the pads on the resistor surface.

First, weld the potentiometer plate vertically to the main board, and then weld the potentiometer.

The variable capacitor should be welded after welding and adjusting the small plate of the tube socket.

The electron tube should be inserted into the soldered small board first, and tied with a cable tie to be flush with the board.

After the small board of the lamp holder is perpendicular to the main board, the 7-pin header is soldered.

The semi-circular pad on the back of the board, short-circuit and non-short-circuit are used to select access or non-access,

1. The antenna can be connected to only one antenna and 10 turns on the magnetic rod for grounding.

2. The 223P included in the variable capacitor kit needs to be short-circuited with the variable foot pads to make the two sets in parallel.

3. Use the transformer to solder only 4, 2 pads on a wire, the middle of the welding is connected to 8 ohms, and the welding side is connected to 32 ohms.

Use the high-resistance headphone transformer to connect the 5 pads without shorting, and connect the high-resistance solder joints and the headphone socket directly with a wire.

4. The headphone socket is inserted into a 2-pin 3.5 to 6.5 high-impedance conversion plug,

It is necessary to cut the solder joints of the lower sound channel to avoid short-circuiting the sound signal.