Preamp NE5532 Op Can Adjust/Customized Three-Frequency Divider Crossover Treble Midrange Bass Output DIT Kit
1 Filter type: subtractive divider
2. Crossover point: Crossover point 500HZ, 5kHZ (that is, 20HZ-500HZ is bass output, 500HZ-5KHZ is midrange output, 5KHZ-20KHZ is treble output)
3. Attenuation slope: -24dB/Oct
4. Board structure: 3-channel output, treble, bass, midrange
5. Op amp chip: NE5532P (other op amps such as OPA2604AP OP275G TL072, etc. can also be replaced )
6. PCB size: 98*84mm
7. DC positive and negative dual 9-15V
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=1. nF, f=4.1kHz f, R=183k
C=1.nF, 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,=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=20.8k.
C=3.3nF, f=1.8kHz Hf, R=19k.
C=3.3nF, f=1.5kHz f, R=22.7k
When C=47nF=1.3kH, R=184k
C=4.7
At 1kHz, R=24k
C=6.8nF, f=1kHz f, R=16.6k.
When C=68nF, f=900Hz, R=18.4k
C=6.8nF, f=800Hz f, R=20.7k
C=6.8nF, f=700kHz Hf, R=23.6K.
When C=10nF, f=700Hz, R=16.1k
C=10nF, f=600Hz Hf, R=18.8k.
When C=10nF, f=500Hz, R=225k (the accurate data should be 22k)
The good effect is related to the relative accuracy of the resistance and capacitance data, especially the resistance needs to be relatively consistent in size. Choose the largest and smallest capacitance in the parallel connection place, so that the error will be smaller.
Note: need to solder by yourself
Package include:
Preamp*1