STK301-220 Sanyo Semiconductor Corporation, STK301-220 Datasheet - Page 6

• Manufacturer Part Number: STK301-220
• Description: 7-band, 2-channel Electronic Equalizer
• Manufacturer: Sanyo Semiconductor Corporation

4. Boost
5. Cut
6. Resonance Circuit Crest Acuteness (Q)
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.
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 R
is established and output voltage eo is calculated as
The gain becomes a minimum when the resonance circuit
has Z at a minimum so that the frequency option is boosted.
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:
The gain becomes a minimum when the resonance circuit
has Z at a minimum so that the frequency option is cut.
Resonance circuit crest acuteness is determined by
comparing frequency widths 2 - 1 for G
G
resonance circuit crest.
The following formula is used to calculate the value for Q:
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.
3. Flat
V
max represents point
When the volume control is set to the midrange
position and Ri=R
established:
ei' =
A
eo = A
A
eo = A
ei' =
is established and output voltage eo is calculated as
eo = A
Q =
V
V
=
=
Ri = R/2
R
C1 · R2
C2 · R1
R
V
V
Ri+Z
V
NF
·ei' = ei
·ei =
·ei' =
R/2
NF
Z
Z
R/2
+ Z
+ R/2
R
· ei, A
Ri+Z
NF
· ei
Z
Z
NF
+ Z
, the following relationships are
V
in which
· ei
0 as the maximum value of the
= 1
· ei
V
max/√2 where
STK301-220
NF
, the following relationship exist:
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