MW AM AM Radio Transmitter DIY Circuit Board Main Board of Special Ore Measuring Radio

color : khaki

Desciption : 

AMT-MW207 medium wave transmitter is a simple amplitude modulation signal source suitable for amateur electronics enthusiasts and radio enthusiasts. It uses a magnetic rod to transmit electromagnetic waves without an external antenna. It can be used to test ordinary medium wave radios and ore radios where the radio signal is insufficient, or as an instrument for debugging medium wave radios.

[Trade name] Experimental medium wave (amplitude modulation) transmitter (Model_AMT-MW207)

[Main characteristics of finished products]

1. Frequency range: 525~1605kHz

2. Power supply voltage: 6V

3. Circuit board size: 78mmx85mm (length × Width)

4. Transmission distance: about 1m for superheterodyne medium wave radio, and about 0.5m for direct and ore radio

[Features]

1. The circuit is simple. It is only composed of common triode and resistance capacitance sensing element, and it is easy to make without audio transformer;

2. Sound quality is good. Within the rated transmission distance, the sound quality is close to FM broadcasting, and the signal-to-noise ratio is good. In particular, the effect of receiving with a repeater is not much different from that of playing modulated signals directly;

3. No external antenna is needed (tens of meters for medium wave), and the receiver is affected completely by the magnetic field leaked by the magnetic rod, which is easy to realize and the transmission distance is relatively short;

4. There are many interfaces, including waveform test terminal, audio socket, external power socket, etc., which are easy to use and expand functions;

5. It can be connected to external power supply or installed with battery for independent use.

[Product Description]

1. The kit adopts a fully discrete circuit, which is especially suitable for students to learn working principles, practice production and test;

2. The variable capacitor uses double variable capacitors, and the two are connected in parallel to obtain sufficient capacity;

3. The double-sided board circuit is adopted. The board base is made of glass fiber material, and the measured thickness is about 1.5~1.6mm. The bonding pad is treated with tin spraying, and can be directly welded without grinding;

4. This product has been modified and improved n times so far (mainly to modify the wiring and circuit of the circuit board), and is still in the process of continuous improvement. It is hereby declared that minor and immaterial modifications, such as minor movement of component position and minor adjustment of wiring, will not change the version number, nor will they be photographed and uploaded again;

5. The instruction manual contains circuit schematic diagram and circuit board diagram, as well as debugging methods and experience under amateur conditions. For more information and professional debugging methods, please download or refer to relevant professional books on the Internet; Mainly due to the change of component position, the circuit structure remains unchanged.

6. The transmitter is equipped with a 3.5mm earphone signal cable, without battery.

[Effect]

This transmitter works well within the effective distance (0.5~1m), and its sound fidelity is high. In particular, you can listen to it with a direct playback radio (such as our 636 and 68-1 single tube machines) in combination with our self-made high impedance dynamic headphones. The sound quality is not much different from the effect of direct playback by the player.

[Illustration]

This product adopts a two-layer stacked structure, and the bottom plate is the battery power supply plate

The battery panel carries four No. 5 alkaline batteries. Because the circuit consumes very little power, it can be used for a long time with battery power

Simple dial (need to be further revised at present)