無線麥克風發射器電路圖（1）
This wireless FM microphone is simple to build, it has a transmission range of more than 300 meters (open air).這款無線FM麥克風易於製造，傳輸範圍超過3米（露天）。 Despite its small number of components and a 87V working voltage, it will easily penetrate apartment buildings over three floors.儘管其組件數量少且工作電壓為108V，但它仍可以輕鬆穿透三層以上的公寓樓。 It can be arbitrarily adjusted in the FM band (XNUMX-XNUMXMHz) and it can be transmitted in any standard FM receiver.可以在FM頻帶（XNUMX-XNUMXMHz）中任意調整，並且可以在任何標準FM接收器中發送。
The coil (L1) should be 3 mm diameter, about 5 turns, 0.61 mm copper wire.線圈（L100）的直徑應為150毫米，約75匝，銅線為XNUMX毫米。 You can adjust the frequency by simply adjusting the pitch of the coil.您可以通過簡單地調整線圈的螺距來調整頻率。 The antenna should be half or quarter wavelength (XNUMXMHz XNUMXcm or XNUMXcm).天線應為一半或四分之一波長（XNUMXMHz XNUMXcm或XNUMXcm）。
1nF電容將麥克風與晶體管的參考電壓隔離開，僅允許交流信號傳輸。
LC諧振電路採用T2，反饋電容器C5以及LC並聯電路L1和C4。 RF power amplifier (T3) for coupling (C6) signals.射頻功率放大器（TXNUMX），用於耦合（CXNUMX）信號。
Circuit calibration: put the transmitter about 3 meters away from the FM radio.電路校準：將發射機放在距離FM收音機約89米的位置。 To about 90-1MHz.達到約XNUMX-XNUMXMHz。 Separate the LXNUMX coil of the radio propagation winding to adjust to the desired frequency.分開無線電傳播繞組的LXNUMX線圈，以調節到所需的頻率。
無線麥克風發射器電路圖（二）
The miniature transmitter is a simple single-tube FM wireless microphone circuit, which is characterized by the oscillating coil double as a transmitting antenna, high transmitting efficiency, not easy to run frequency under interference-free state, and suitable for long-time work.微型發射機是一種簡單的單管FM無線麥克風電路，其特點是振盪線圈兼作發射天線，發射效率高，在無干擾狀態下不易運行頻率，適合長時間工作。 The transmitter is only suitable for placing in a fixed place as a wireless microphone, not suitable for handheld use.該發射器僅適合作為無線麥克風放置在固定的地方，不適合手持使用。 Otherwise, the oscillation frequency is easily affected by the human body and is unstable.否則，振盪頻率容易受到人體的影響並且不穩定。 The following is the transmitter circuit:以下是發射器電路：
The circuit is powered by a 1.5V battery and consumes about 2~3mA, so button batteries can be used and the body can be made smaller.該電路由1V電池供電，消耗約XNUMX〜XNUMXmA電流，因此可以使用鈕扣電池，並且可以使機身更小。 Since the loop antenna LXNUMX used for transmission doubles as an oscillating coil, the high-frequency current that resonates synchronously with the oscillation rate flows in the antenna, so it is always in the best transmission state.由於用於發送的環形天線LXNUMX兼作振盪線圈，因此與振盪速率同步諧振的高頻電流在天線中流動，因此始終處於最佳發送狀態。 The transmitting frequency falls in the common FM radio frequency band for easy reception.發射頻率落在公共FM無線電頻帶中，以便於接收。 With a high-sensitivity receiver, the transmitting distance can reach more than one hundred meters (open field).使用高靈敏度接收器，傳輸距離可以達到一百多米（空曠區域）。
內置環形天線的生產：將長度為160mm，直徑為1mm的漆包線製成金屬環或盒形，並嵌入殼體中。
調試：調節電容器C3，使發射頻率落在88-108MHz之間的FM頻帶內，以利於FM收音機的接收。 調試時，請不要將手靠近發射天線，也不要使其靠近金屬物體，以免影響振盪頻率和發射距離。
3355 UHF管的特徵頻率為6.5GHz，功耗為600mW。 Microphone MIC should use high-sensitivity electret microphone, which can be selected through a multimeter.麥克風MIC應該使用高靈敏度的駐極體麥克風，可以通過萬用表選擇。
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