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    Ore radio with audio amplifier ----- Crystal Set

     

    How can I make the sound of the ore radio zoom in? According to the results of our trial, improve the efficiency of the amplifier or an amplifier is the most effective way. Other ways to do on the tuner or detector, the role is not big (if there is a good antenna or groundline, there are certainly a lot But this is independent of the ore itself). Therefore, in addition to adding high-efficiency speakers in the first radio, we are equipped with an amplifier portion in the second radio. Such an amplifier only needs to use the dry battery 1 or 2 of the flashlight. The current is only 10 ~ 30 mA, very power-saving, the switch is installed in the line, and the power supply can be cut off, such as 2 ~ 3 daily. Hours, can be used for about three months. The unit is completely with the first type in addition to the amplifier portion and the speaker, the amplifier is the same electromagnet and a coil or a tongue spring (or a speaker without a paper pot) with a small vibrating board. The carbon concentrator, the two ends of the sending call are then speakers through the battery string (see Figure 2, Figure 3). The audio current after the detection can pass the mechanical vibration conducted guidelines generated by the speaker generated by the speaker without the paper basin, so the current through the fluid will also change with the same waveform as the detection current, so that the speaker is emitted. The big voice has completed the zoom in task.

     

     

     

     

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