Feature:
1. NE5532P Chip: Other op amp chip such as OPA2604AP OP275G TL072, etc. can also be replaced, very simple and practical.
2. Board Structure: 3 channel output, treble, bass, midrange, which ensures good sound quality and more audio enjoyment.
3. Crossover Point: 500HZ, 5kHZ, that is, 20HZ?500HZ is bass output, 500HZ?5KHZ is midrange output, 5KHZ?20KHZ is treble output.
4. Filter Type: Subtractive divider, also comes with ?24dB/Oct attenuation slope, so the preamp module has high efficiency.
5. Easy to Install: Designed to have a light weight and a compact size as well, the installation is very convenient.
Specification:
Item Type: Preamp Module
Model: NE5532
Material: PCBA
Attenuation Slope: -24dB/Oct
Product Size: Approx. 98 x 84 x 20mm / 3.86 x 3.31 x 0.79in
Power: DC positive and negative, dual 9-15V.
Package List:
1 x Preamp Module
Note:
The 10k resistor in the picture above cannot be changed.
The R calculated by the calculation software is too large, such as C=1nF, f=5kHz, according to the formula f=0.707/(2X314Rc) the data is very accurate, R=22k. So the following number.
According to (Increase C by 10 times, R remains unchanged, f becomes 1/10 of the original) For reference only:
When C=1nF, f=5kHz, R=225k (the accurate data should be 22k)
C=1nF, f=4.7kHz f, R=24K.
C=1nF, f=4.4kHz #f, R=256k.
C=1nF, f=4.1kHz f, R=183k
C=1nF, f=3.8kHz Hf, R=19.7k.
When C=1.5nF, f=3.5kH, R=214kC=1.5nF
When f=35kHz, R=21.4k
When C=15nF, f=32kHz, R=235k (I used C=15nF, R=22k, use the formula f=3333Hz, use soft piece f=3410Hz)
C=2.2nF, f=3kHz Hf, R=17k
C=2.2nF, f=2.8kHz Hf, R=183k
C=2.2nF, f=2.5kHz f, R=20.5k.
C=2.2nF, f=2.2KHz Hf, R=233k
C=2.7nF, f=2.2kHz Bf, R=19k.
C=2.7nF, f=2KHz Hf, R=20