4管发射机原理图
出处：dadodo 发布于：2008-05-10 00:00:00 | 1817 次阅读
Circuit Notes
This circuit provides an FM modulated signal with an output of around 500mW. The input
Mic preamp is built around a couple of 2n3904 transistors, audio gain limited by the 5k preset.
The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from
two 5pF capacitors and the inductor. ( Click here for Colpitt Oscillator Resonant Frequency Equation.)
Frequency is around 100Mhz with values shown.
Audio modulation is fed into the tank circuit via the 5p capacitor, the 10k resistor and 1N4002
controlling the amount of modulation. The oscillator output is fed into the 3.9uH inductor which
will have a high impedance at RF frequencies.
The output stage operates as a class D amplifier , no direct bias is applied but the RF signal developed
across the 3.9uH inductor is sufficient to drive this stage. The emitter resistor and 1k base resistor
prevent instability and thermal runaway in this stage.
版权与免责声明
凡本网注明“出处：维库电子市场网”的所有作品，版权均属于维库电子市场网，转载请必须注明维库电子市场网，//fzqkw.cn，违反者本网将追究相关法律责任。
本网转载并注明自其它出处的作品，目的在于传递更多信息，并不代表本网赞同其观点或证实其内容的真实性，不承担此类作品侵权行为的直接责任及连带责任。其他媒体、网站或个人从本网转载时，必须保留本网注明的作品出处，并自负版权等法律责任。
如涉及作品内容、版权等问题，请在作品发表之日起一周内与本网联系，否则视为放弃相关权利。
