Difference between revisions of "BUTTER07"
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== Features == | == Features == | ||
− | * 7th Order | + | * Low Pass Butterworth Filter |
+ | ** 7th Order Butterworth Filter | ||
** Shunt first | ** Shunt first | ||
** 4 caps, 3 inductors | ** 4 caps, 3 inductors | ||
Line 60: | Line 61: | ||
== BUTTER07 Design == | == BUTTER07 Design == | ||
+ | |||
+ | [[FILE:BUTTER07-3D-SCHEM.png]] | ||
[[FILE:BUTTER07-3D-FRONT.png]] | [[FILE:BUTTER07-3D-FRONT.png]] | ||
− | + | === BUTTER07 Values === | |
− | |||
− | === Values === | ||
{| class="wikitable" | {| class="wikitable" | ||
Line 74: | Line 75: | ||
! L2 (uH) | ! L2 (uH) | ||
|- | |- | ||
− | | | + | | 1.8 |
− | | | + | | 820 |
− | | | + | | 3300 |
− | | 2. | + | | 5.6 |
− | | | + | | 9.1 |
+ | |- | ||
+ | | 3.5 | ||
+ | | 390 | ||
+ | | 1600 | ||
+ | | 2.7 | ||
+ | | 4.7 | ||
|- | |- | ||
| 7 | | 7 | ||
Line 109: | Line 116: | ||
* [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN] | * [https://kitsandparts.com/PCBs/LPF/filter1.pdf 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN] | ||
− | * Other values are different from the calculator values | + | ** Notches out 2nd harmonic |
+ | ** Additional capacitor on center inductor | ||
+ | ** Other values are different from the calculator values | ||
[[file:CWAZ_Schematic.PNG]] | [[file:CWAZ_Schematic.PNG]] |
Latest revision as of 17:07, 30 October 2021
Contents
Features
- Low Pass Butterworth Filter
- 7th Order Butterworth Filter
- Shunt first
- 4 caps, 3 inductors
- Bourns Inductors, 0603, CS160808 family - inexpensive
- Can mount end launch SMT connectors or three pin headers
- 50 Ohms in/out
Calculator (7 MHz example)
Parts
Cutoff Freq (MHz) | C1/C7 (pF) | C3/C5 (pF) | L2/L6 (uH) | L4 (uH) |
---|---|---|---|---|
4 | 360 | 1500 | 2.4 | 3.9 |
7 | 200 | 820 | 1.5 | 2.2 |
14 | 100 | 390 | 0.68 | 1.1 |
21 | 68 | 270 | 0.47 | 0.75 |
28 | 51 | 200 | 0.36 | 0.56 |
BUTTER07 Design
BUTTER07 Values
Cutoff Freq (MHz) | C1/C4 (pF) | C2/C3 (pF) | L1/L3 (uH) | L2 (uH) |
---|---|---|---|---|
1.8 | 820 | 3300 | 5.6 | 9.1 |
3.5 | 390 | 1600 | 2.7 | 4.7 |
7 | 200 | 820 | 1.5 | 2.2 |
14 | 100 | 390 | 0.68 | 1.1 |
21 | 68 | 270 | 0.47 | 0.75 |
28 | 51 | 200 | 0.36 | 0.56 |
CWAZ Filter
- 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN
- Notches out 2nd harmonic
- Additional capacitor on center inductor
- Other values are different from the calculator values
Cutoff Freq (MHz) | C1/C7 (pF) | C3/C5 (pF) | C4 (pF) | L2/L6 (uH) | L4 (uH) |
---|---|---|---|---|---|
1.8 | 1659 | 2631 | 378 | 5.21 | 4.73 |
3.5 | 853 | 1302 | 194 | 2.68 | 2.43 |
7 | 727 | 651 | 97 | 1.34 | 1.22 |
10.1 | 296 | 451 | 67 | 0.928 | 0.843 |
14 | 213 | 325 | 49 | 0.67 | 0.608 |
18.068 | 165 | 252 | 38 | 0.519 | 0.471 |
21 | 142 | 217 | 32 | 0.446 | 0.406 |
24.89 | 120 | 183 | 27 | 0.377 | 0.342 |
28 | 107 | 163 | 24 | 0.335 | 0.304 |
Built on BUTTER07 Board
- BUTTER07 with extra capacitor for 2nd order harmonic suppression
- L2 and C5 are piggybacked
- 9 MHz