Use FM head make a FM transmitter

With a high-level part of the damaged head of the FM (FM), produced an FM transmitter,

Head is used in a Mi Zimi FM FM head, of course, can also be used with other FM local oscillator output head. Because in the production, when using only part of the oscillator, so even high-level corruption and mixing does not matter. And in actual use, the first local oscillator frequency modulation is also very little damage. So, you can use some of the damage to the FM head production.

Use only Mizi Mi FM radio head, making the FM transmitter shown in Figure 1, simply remove the original components of FM head, and then add more components as shown below, the antenna with a 50cm telescopic antenna, can also be used soft wire. VD1 and VR1 best use of high precision components to ensure the frequency stability. After welding, the AUD10 VCD audio signal at the input, then use a FM radio (preferably a few tune), to find in the 100Hz-108MHz frequency without a local radio station. Then turn VR1, you can receive the signal, then adjust VR2 so that the appropriate volume without distortion, to within 20 meters, with a portable radio listening clearly. And touch the transmitting antenna, the slightest change in their frequency does not occur, can be described as a superior performance in FM transmitter.

FM wireless microphone if you want made​​, just add the following figure circuit, you can become a high-performance wireless microphone. You can also launch an external power allows continuation farther.

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