The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. However a
如圖所示為用頻率控制增益的放大電路。用不同的輸入時(shí)鐘頻率來(lái)控制放大器增益的電路稱(chēng)為頻率增益控制電路。由圖(a)可知,該電路由兩部分構(gòu)成:模擬開(kāi)關(guān)和集成運(yùn)放。模擬開(kāi)關(guān)由兩片精密電容開(kāi)關(guān)LTC1043組成;集成運(yùn)放
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