STK301-220 查看數據表（PDF） - SANYO -> Panasonic
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STK301-220 Datasheet PDF : 8 Pages
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STK301-220
3. Flat
When the volume control is set to the midrange
position and Ri=RNF, the following relationships are
established:
ei' = R/2 · ei
Ri = R/2
AV =
RNF + R/2
R/2
in which
eo = AV·ei' = ei
with no relation to the resonance circuit and frequency
characteristics become flat.
When VR is set to R, the resistance value using the VR
center position becomes R/2.
4. Boost
When the volume control is set to the boost position, the resonance circuit is linked to the NF loop of the output
buffer amplifier. Under these circumstances and when R»Ri and RNF, the following relationship exist:
AV =
RNF + Z
Z
is established and output voltage eo is calculated as
eo = AV·ei =
RNF + Z
Z
· ei
The gain becomes a minimum when the resonance circuit
has Z at a minimum so that the frequency option is boosted.
5. Cut
When volume is set to the cut side, resonance circuit is linked to the input side of the output buffer amplifier. Under
these circumstances and when ignoring R similarly to boost, the following relationship exist:
Z
ei' = Ri+Z · ei, AV = 1
is established and output voltage eo is calculated as
Z
eo = AV·ei' = Ri+Z · ei
The gain becomes a minimum when the resonance circuit
has Z at a minimum so that the frequency option is cut.
6. Resonance Circuit Crest Acuteness (Q)
Resonance circuit crest acuteness is determined by
comparing frequency widths ω2 - ω1 for GV max/√2 where
GV max represents point ω0 as the maximum value of the
resonance circuit crest.
The following formula is used to calculate the value for Q:
Q = C1 · R2
C2 · R1
As the value for Q becomes larger, the participating frequency bandwidth of the resonance circuit becomes narrower.
Although neighboring bands distinction is precise, the swell of frequency characteristics under total boost is larger
while the peak of the resultant frequency is lowered.
No. 4793-6/8
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