2 layers81.5 × 49.2 mm
28mhz class e amplifier for pi
BenBean18/RadioNotes
I'm sure I'll think of more things to add, this is a WIP.
26 parts1
2 layers73.2 × 56 mm
28mhz new
BenBean18/RadioNotes1I'm sure I'll think of more things to add, this is a WIP.
- Size
- 73.2 × 56 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 54
- Pads
- 132
- Tracks, vias
- 90, 102
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 12 Nov 2024
- Updated
- 6 Oct 2025
Overview
28mhz new is an open-source printed circuit board by BenBean18, from the BenBean18/RadioNotes repository on GitHub. It is a 2-layer board of 73.2 × 56 mm with 44 parts on 54 nets, routed with 90 tracks and 102 vias.
It is built around the 647-25ABPE, CONBNC002 and RD16HHF1. Its parts include 6 resistors, 4 capacitors, 2 connectors and 2 inductors.
Main components
3README
README.mdKQ4TVW's radio notes
This is an attempt to put much of the random radio knowledge I'm trying to collect in one place for future reference. Radio is really hard and there are so many different things to understand and keep track of, so I thought I'd create a journal thing. Not sure where this is going to go, but I'll probably update this README when I find out :)
Topics
- Signal processing
- Antenna design
- Amplifier design
- Filter design
- Practical usage/application (tools, resources, etc)
I'm sure I'll think of more things to add, this is a WIP.
Useful general resources
- https://pysdr.org/index.html
- https://www.electronics-notes.com/articles/radio/rf-mixer/fet-rf-mixer.php
- https://hackaday.com/2020/07/17/modern-radio-receiver-architecture-from-regenerative-to-direct-conversion/
- https://people.physics.anu.edu.au/~dxt103/160m/class_E_amplifier_design.pdf SATURATION VOLTAGE IS ZERO FOR A FET
Journal
Parts
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 2N3904 | Package_TO_SOT_THT:TO-92L_Inline | QN1, QN2, QN3, QN4 |
| 4 | 330 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, RC1, RE2, RE3 |
| 3 | 220p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, CF2, CM1 |
| 3 | MountingHole_2.7mm_M2.5 | MountingHole:MountingHole_2.7mm_M2.5 | MH1, MH2, MH4 |
| 2 | 0 | Resistor_SMD:R_2512_6332Metric | R2, R3 |
| 2 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | RB5, RB6 |
| 2 | 120p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | CF1, CF3 |
| 2 | 390n | 2929SQ-391GEC:2929SQ391GEC | LF1, LF2 |
| 2 | 4.7k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | RB4, RB7 |
| 2 | 50 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | RC2, RC3 |
| 2 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | RBI1, RBI2 |
| 1 | 0.022µ | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | CB1 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | RB3 |
| 1 | 10µ | B82144A2103K:INDAD3280W80L1200D520 | L1 |
| 1 | 110p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 180n | 2222SQ:2222SQ181JEC | LM1 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | RB1 |
| 1 | 2N3906 | Package_TO_SOT_THT:TO-92L_Inline | QP1 |
| 1 | 3.3k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | RB2 |
| 1 | 33 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | RE1 |
| 1 | 330n | 2929SQ-331GEC:2929SQ331GEC | L2 |
| 1 | 430n | 2929SQ-431GEC:2929SQ431GEC | LM2 |
| 1 | 647-25ABPE | heatsink:64725ABPE | H1 |
| 1 | 694106301002 | barreljack:694106301002_1 | J2 |
| 1 | CONBNC002 | BNC:CONBNC002 | B1 |
| 1 | GPIO | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J1 |
| 1 | RD16HHF1 | Package_TO_SOT_THT:TO-220-3_Vertical | M1 |
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Questions
How big is the 28mhz new PCB?
It measures 73.2 × 56 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 28mhz new use?
44 parts, built around the 647-25ABPE, CONBNC002 and RD16HHF1. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 28mhz new KiCad files?
From the BenBean18/RadioNotes repository on GitHub, at the commit this page was made from: the board is amplifier/28mhz_new/28mhz_new.kicad_pcb and its schematic amplifier/28mhz_class_e_amplifier_for_pi/28mhz_class_e_amplifier_for_pi.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 28mhz new design in my own project?
Its repository states no licence, so its author keeps all rights: ask BenBean18 before reusing the design.