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Lefty lp filter

hwstar·lefty-lp_filter

Lefty lp filter PCB layout, top view — open source board by hwstar
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About the Lefty lp filter PCB

Lefty lp filter is an open source PCB design by hwstar, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 200 × 100 mm, with 230 components from 51 distinct parts.

Other key parts include the 800237-101. By type, the board carries 125 capacitors, 26 resistors, 24 inductors, 17 relays, 8 transistors and 8 LEDs.

It belongs with the rf & radio designs in this gallery.

From the project

Low pass filter board for the lefty HF transceiver

This is an 8 band low pass filter board for the Lefty Transceiver.

The schematic capture and pwb layout was originally done in KiCAD 5 and migrated to KiCAD 6.

The filters are individually selectable via an I2C port expander.

The filter topology used in the design is:

"Second-Harmonic Optimized Low Pass Filters" by Ed Wetherhold, W3NQN https://www.arrl.org/files/file/Technology/tis/info/pdf/9902044.pdf

Lefty lp filter, from the project README
From the project README

Main components on the Lefty lp filter

800237-101

Lefty lp filter bill of materials (BOM)

230 components, 51 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
800237-101
PCA9554APW
U1
8
800110-101
MMBT4401
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8
3
800233-101
CONN_SMA_LAUNCH
J1, J2, J3
1
800114-108
CONN8
J4
9
800127-101
BAT54
CR1, CR2, CR3, CR4, CR5, CR6, CR7, CR8 +1
3
80000X-XXX
FB0805
E1, E2, E3
17
800231-101
HK4100F-DC12V-SHCG
K1, K2, K3, K4, K5, K6, K7, K8 +9
3
SJSPDT
SJ1, SJ2, SJ3
1
800116-101
GND
TP1
1
800121-101
NCP1117ST33
VR1
8
800113-102
GREEN
DS1, DS2, DS3, DS4, DS5, DS6, DS7, DS8
2
800234-802
2.68uH
L1, L3
1
800234-802
2.43uH
L2
2
800234-686
1.34uH
L4, L6
1
800234-686
1.22uH
L5
2
800234-506
0.67uH
L7, L9
1
800234-506
0.608uH
L8
2
800234-506
0.519uH
L10, L12
1
800234-506
0.471uH
L11
2
800234-506
0.447uH
L13, L15
Show 31 more
QtyPartRefs
1
800234-506
0.406uH
L14
2
800234-506
0.377uH
L16, L18
1
800234-506
0.342uH
L17
2
800234-506
0.335uH
L19, L21
1
800234-506
0.304uH
L20
2
800234-802
5.21uH
L22, L24
1
800234-802
4.73uH
L23
23
800063-XXX
0.1u
C1, C4, C5, C6, C7, C8, C107, C108 +15
2
800063-XXX
10u
C2, C3
7
800232-151
150p
C9, C53, C56, C63, C72, C96, C105
3
800232-470
47p
C10, C36, C94
2
800232-471
470p
C11, C20
2
800232-391
390p
C12, C21
38
800XXX-XXX
DNI
C13, C16, C19, C22, C26, C29, C32, C35 +30
2
800232-122
1200p
C14, C17
9
800232-101
100p
C15, C18, C23, C25, C34, C54, C57, C85 +1
11
800232-331
330p
C24, C27, C28, C30, C31, C33, C40, C43 +3
4
800232-221
220p
C37, C46, C66, C69
1
800232-390
39p
C49
8
800232-820
82p
C50, C51, C59, C60, C87, C88, C89, C90
1
800232-330
33p
C62
2
800232-270
27p
C75, C84
2
800232-121
120p
C76, C82
2
800232-181
180p
C78, C80
2
800232-152
1500p
C95, C104
2
800232-222
2200p
C98, C101
2
800063-XXX
100p
C124, C125
8
800XXX-XXX
2.2K
R1, R3, R7, R9, R19, R21, R23, R25
8
800XXX-XXX
1K
R2, R4, R8, R18, R20, R22, R24, R26
2
800XXX-XXX
10K
R5, R6
8
800XXX-XXX
12K
R10, R11, R12, R13, R14, R15, R16, R17

Lefty lp filter design files

The KiCad project lives in the hwstar/lefty-lp_filter repository on GitHub; these links point at the commit this page was built from.

Lefty lp filter: common questions

How big is the Lefty lp filter PCB?

The Lefty lp filter measures 200 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lefty lp filter?

230 components, from 51 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Lefty lp filter design files?

From the hwstar/lefty-lp_filter repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Lefty lp filter design in my own project?

Yes, under the terms of its CC0-1.0 license, which hwstar chose for the repository.

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