HardLabs

LowPassFilter

profdc9·RFBitBanger·LowPassFilter/LowPassFilter.kicad_pcb

LowPassFilter PCB layout, top view — open source board by profdc9
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About the LowPassFilter PCB

LowPassFilter is an open source PCB design by profdc9, published on GitHub. It is a 2-layer board measuring 35.6 × 26.4 mm, with 11 components from 11 distinct parts.

By type, the board carries 6 capacitors, 2 connectors, 2 inductors and 1 transformer.

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

From the project

A QRP digital transceiver created from readily available parts for off-the-grid maintenance

A presentation presented at the 2023 QSO Today conference on the RFBitBanger can be viewed on Youtube here.

A single band double-sideband radio, with the band changed by pluggable external filters on 20 m to 80 m. A double-balanced ring mixer is used to provide good rejection of strong stations while not requiring any custom ICs such as SA612 or FST3253. The mixer has strong drive to reduce nonlinearity. Can be assembled and operated by a properly licensed individual that may not have a great deal of electronics experience or experience at making HF contacts. The radio is made from readily…

LowPassFilter, from the project README
From the project README

LowPassFilter bill of materials (BOM)

11 components, 11 distinct parts.

QtyPartRefs
1
OUT
J1
1
INP
J2
1
DoubleWindingTransformer
T1
1
L1
L1
1
L2
L2
1
C1
C1
1
C2
C2
1
C3
C3
1
C4
C4
1
C5
C5
1
C6
C6

LowPassFilter design files

The KiCad project lives in the profdc9/RFBitBanger repository on GitHub; these links point at the commit this page was built from.

LowPassFilter: common questions

How big is the LowPassFilter PCB?

The LowPassFilter measures 35.6 × 26.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the LowPassFilter?

11 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the LowPassFilter design files?

From the profdc9/RFBitBanger repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the LowPassFilter design in my own project?

The repository has no license, so all rights stay with profdc9. Use it as a reference, and ask the author before reusing the design.

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