Mạch điều chỉnh âm lượng (Audio Fader)

Mạch điều chỉnh âm lượng (Audio Fader)

Nguyên văn tiếng Anh:

In this circuit, Q1 is a simple amplifier that has its gain controlled by a variable emitter resistance supplied by FET Q2. In the up position of S1, C3 discharges through R5 and the gain of Q1 decreases because Q2 is driven toward cut-off. In the down position, Q2 conducts more, depending on the setting of R6, which causes a gain increase. By varying R5 or C3, various fade rates can be obtained. (Hands-On Electronics 8/87, p. 93)

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