使用CD4069非門(mén)電路制作的調(diào)頻話筒（英文）,FM Transmitter Using Logic Gates

關(guān)鍵字：CD4069,調(diào)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 microphone 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(gè)調(diào)頻發(fā)射機(jī)電路。該電路采用邏輯門(mén)。該發(fā)射機(jī)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(mén)N2驅(qū)動(dòng)并聯(lián)組合N6通過(guò)N4 N3。這里是電路：
由于這些非門(mén)并聯(lián)，所以輸出阻抗很低，因此可以直接驅(qū)動(dòng)1／4波長(zhǎng)的天線。會(huì)有很多諧波在n4-n6輸出由于輸出N4 N6是方波。第九次諧波的10.7兆赫（96.3mhz）會(huì)因此在FM頻段的中心。作為音頻放大器，該電路采用N1。它會(huì)放大來(lái)自麥克風(fēng)的音頻信號(hào)和變?nèi)荻�極管。該變電容的信號(hào)，將改變振蕩器的頻率，產(chǎn)生不同的頻率調(diào)制。