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。用不同的輸入時鐘頻率來控制放大器增益的電路稱為頻率增益控制電路。由圖(a)可知,該電路由兩部分構(gòu)成:模擬開關(guān)和集成運放。模擬開關(guān)由兩片精密電容開關(guān)LTC1043組成;集成運放
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