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작성일 : 05-02-22 09:31
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글쓴이 :
새잡이
 조회 : 2,106
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주로 고역대의 피킹등을 없애고 스무스한 반응을 보이기 위한 일종의 조벨 네트워크입니다. 게인등에도 약간 영향을 줄 수가 있으나 게인조절을 위한 것은 아니라고 생각됩니다.
mc 카트리지의 경우 승압트랜스 2차에 로딩저항 캐퍼시터들을 다는 것도 일종의 조벨네트워크라고 보시면 될 것입니다.
데이브 데이븐포트가 잡지에 기고한 자신의 OPT를 이용한 프리앰프에서 여기에 대한 글을 간략하게 옮겨 써봅니다.
The purpose of the RC network on the secondary of the transformer is to tame a peak in the frequency response of the LL1660 at around 80KHz. You can see the result of this peak on an oscilloscope as an overshoot or ringing on the leading edge of a 1 KHz square wave. The peak, which is caused by leakage inductance and distributed capacitance, is common in transformers. Design of the RC network is empirical, accomplished by substituting different values of resistance and capacitance while watching the resultant square wave on a scope. The objective is to find the largest value of resistance and the smallest value of capacitance that produces the best-looking square wave. The problem is – you don’t listen to square waves, and the best-looking square wave doesn’t necessarily correlate to the best-sounding music. So my process for determining the network is to start with the square wave to get in the ballpark and then go to listening to music while adjusting the RC values. I found that I preferred a 2KW resistor and no capacitor at all. Adding a load on the secondary of a transformer will decrease the level of the signal but there is more than enough gain in the circuit so this is not a problem. We’ll come back to this network a couple of times in later articles of this series.
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