使用CD4069非門電路製作的調頻話筒（英文）,FM Transmitter Using Logic Gates

關(guan) 鍵字：CD4069,調頻電路圖

This is a FM Transmitter circuit. This circuit uses logic gates. This transmitter circuit has a RF oscillator. This oscillator uses 10.7Mhz ceramic filter and inverter N2 to drive the parallel combination of N4 to N6 through N3. Here is the circuit:

The output impedance will be low because these inverters are in parallel, so an aerial of 1/4h wavelength can be driven directly. There would be a lot of harmonics in the output of N4-N6 because the output of N4 to N6 is square wave. The 9th harmonics of 10.7Mhz (96.3Mhz) will hence be at the center of the FM band. As an audio amplifier, this circuit uses N1. It will amplify audio signals from the microphones and fed it to varycap diode. The capacitance of the varycap is varied by the signal that will vary the oscillator frequency that produce Frequency Modulation.

這是一個(ge) 調頻發射機電路。該電路采用邏輯門。該發射機電路具有射頻振蕩器。該振蕩器采用10.7mhz陶瓷濾波器和非門N2驅動並聯組合N6通過N4 N3。這裏是電路：
由於(yu) 這些非門並聯，所以輸出阻抗很低，因此可以直接驅動1／4波長的天線。會(hui) 有很多諧波在n4-n6輸出由於(yu) 輸出N4 N6是方波。第九次諧波的10.7兆赫（96.3mhz）會(hui) 因此在FM頻段的中心。作為(wei) 音頻放大器，該電路采用N1。它會(hui) 放大來自麥克風的音頻信號和變容二極管。該變電容的信號，將改變振蕩器的頻率，產(chan) 生不同的頻率調製。