TCJ Filter Design is easy to use, but not lightweight, holding over 60 filter topologies and up to four filter alignments: Bessel, Butterworth, Gaussian, and Linkwitz-Riley.

Passive Filters

1. low-pass 1st-order RC filter
   
2. low-pass 1st-order LCR filter
   
3. high-pass 1st-order RC filter
   
4. high-pass 1st-order LCR filter
   
5. low-pass 2nd-order RC filter
   
6. low-pass 2nd-order LCR filter
   
7. high-pass 2nd-order RC filter
   
8. high-pass 2nd-order LCR filter
   
9. low-pass 3rd-order LCR filter
   
10. high-pass 3rd-order LCR filter
    
11. low-pass 4th-order LCR filter
    
12. high-pass 4th-order LCR filter
    

1. low-pass 1st-order filter
   
2. low-pass inverting 1st-order filter
   
3. high-pass 1st-order filter
   
4. high-pass inverting 1st-order filter
   
5. low-pass 2nd-order filter
   
6. low-pass 2nd-order equal value capacitors filter
   
7. low-pass -inverting 2nd-order MFB filter
   
8. high-pass 2nd-order filter
   
9. high-pass 2nd-order equal valued resistors filter
   
10. high-pass -inverting 2nd-order MFB filter
    
11. low-pass 3rd-order filter
    
12. low-pass 3rd-order two-section filter
    
13. low-pass 3rd-order two-section equal valued capacitors filter
    
14. low-pass -inverting 3rd-order MFB filter
    
15. high-pass 3rd-order filter
    
16. high-pass 3rd-order two-section filter
    
17. high-pass 3rd-order two-section equal valued resistors filter
    
18. high-pass -inverting 3rd-order MFB filter
    
19. low-pass 4th-order filter
    
20. low-pass 4th-order two-section equal valued capacitors filter
    
21. high-pass 4th-order filter
    
22. high-pass 4th-order two-section equal valued resistors filter
    
23. low-pass -inverting 4th-order MFB filter
    
24. high-pass -inverting 4th-order MFB filter
    

1. low-pass 1st-order filter
   
2. low-pass 1st-order self-bias filter
   
3. low-pass 1st-order self-bias buffered filter
   
4. high-pass 1st-order self-bias filter
   

1. high-pass 1st-order self-bias buffered filter
   
2. low-pass 2nd-order filter
   
3. low-pass 2nd-order self-bias filter
   
4. low-pass 2nd-order self-bias buffered filter
   
5. high-pass 2nd-order filter
   
6. high-pass 2nd-order self-bias filter
   
7. low-pass 3rd-order filter
   
8. low-pass 3rd-order self-bias filter
   
9. low-pass 3rd-order self-bias buffered filter
   
10. low-pass 3rd-order two-section filter
    
11. low-pass 3rd-order two-section filter self-bias
    
12. low-pass 3rd-order two-section self-bias   buffered filter
    
13. high-pass 3rd-order
    
14. high-pass 3rd-order self-bias filter
    
15. high-pass 3rd-order two-section filter
    
16. high-pass 3rd-order two-section self-bias filter
    
17. low-pass 4th-order filter
    
18. low-pass 4th-order self-bias filter
    
19. low-pass 4th-order self-bias buffered filter
    
20. high-pass 4th-order filter
    
21. high-pass 4th-order self-bias buffered filter
    
22. Output coupling capacitor 1st-order filter
    

How to Use the Program
     This program takes advantage of point and click interaction. The Fc frequency is entered in the drop-down box or the adjoining arrow buttons are pressed to move the frequency up or down to the desired value. 

     Clicking on any of the 17 filter choice buttons, causes the program to find and display the appropriate filter. And the drop-down box below the buttons is used to select the desired filter alignment.
    Each time a new filter is chosen, the user-definable part list is displayed in the Circuit Element choice box of the program.

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