无线麦克风发射器电路图（1）
This wireless FM microphone is simple to build, it has a transmission range of more than 300 meters (open air).这款无线FM麦克风易于制造，传输范围超过3米（露天）。 Despite its small number of components and a 87V working voltage, it will easily penetrate apartment buildings over three floors.尽管其组件数量少且工作电压为108V，但它仍可以轻松穿透三层以上的公寓楼。 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频带（XNUMX-XNUMXMHz）中任意调整，并且可以在任何标准FM接收器中发送。
The coil (L1) should be 3 mm diameter, about 5 turns, 0.61 mm copper wire.线圈（L100）的直径应为150毫米，约75匝，铜线为XNUMX毫米。 You can adjust the frequency by simply adjusting the pitch of the coil.您可以通过简单地调整线圈的螺距来调整频率。 The antenna should be half or quarter wavelength (XNUMXMHz XNUMXcm or XNUMXcm).天线应为一半或四分之一波长（XNUMXMHz XNUMXcm或XNUMXcm）。
1nF电容将麦克风与晶体管的参考电压隔离开，仅允许交流信号传输。
LC谐振电路采用T2，反馈电容器C5以及LC并联电路L1和C4。 RF power amplifier (T3) for coupling (C6) signals.射频功率放大器（TXNUMX），用于耦合（CXNUMX）信号。
Circuit calibration: put the transmitter about 3 meters away from the FM radio.电路校准：将发射机放在距离FM收音机约89米的位置。 To about 90-1MHz.达到约XNUMX-XNUMXMHz。 Separate the LXNUMX coil of the radio propagation winding to adjust to the desired frequency.分开无线电传播绕组的LXNUMX线圈，以调节到所需的频率。
无线麦克风发射器电路图（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.微型发射机是一种简单的单管FM无线麦克风电路，其特点是振荡线圈兼作发射天线，发射效率高，在无干扰状态下不易运行频率，适合长时间工作。 The transmitter is only suitable for placing in a fixed place as a wireless microphone, not suitable for handheld use.该发射器仅适合作为无线麦克风放置在固定的地方，不适合手持使用。 Otherwise, the oscillation frequency is easily affected by the human body and is unstable.否则，振荡频率容易受到人体的影响并且不稳定。 The following is the transmitter circuit:以下是发射器电路：
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.该电路由1V电池供电，消耗约XNUMX〜XNUMXmA电流，因此可以使用纽扣电池，并且可以使机身更小。 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.由于用于发送的环形天线LXNUMX兼作振荡线圈，因此与振荡速率同步谐振的高频电流在天线中流动，因此始终处于最佳发送状态。 The transmitting frequency falls in the common FM radio frequency band for easy reception.发射频率落在公共FM无线电频带中，以便于接收。 With a high-sensitivity receiver, the transmitting distance can reach more than one hundred meters (open field).使用高灵敏度接收器，传输距离可以达到一百多米（空旷区域）。
3355 UHF管的特征频率为6.5GHz，功耗为600mW。 Microphone MIC should use high-sensitivity electret microphone, which can be selected through a multimeter.麦克风MIC应该使用高灵敏度的驻极体麦克风，可以通过万用表选择。
