2 layers152 × 88 mm
RFBitBangSMT
profdc9/RFBitBanger
A QRP digital transceiver created from readily available parts for off-the-grid maintenance
271 parts222
2 layers163.2 × 74.3 mm
BT DMG
benpocalypse/bentendo2My take on an all in one carrier board for a Raspberry Pi Zero based handheld gaming system.
- Size
- 163.2 × 74.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 79
- Pads
- 250
- Tracks, vias
- 1,060, 223
- Pours
- 18
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 5 Jun 2018
- Updated
- 5 Jun 2018
Overview
BT DMG is an open-source printed circuit board by benpocalypse, from the benpocalypse/bentendo repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 163.2 × 74.3 mm with 77 parts on 79 nets, routed with 1,060 tracks and 223 vias.
It is built around the LM386. Its parts include 22 capacitors, 21 resistors, 12 connectors, 12 switches and 7 ICs.
Main components
1README
README.mdBentendo DMG
My take on an all in one carrier board for a Raspberry Pi Zero based handheld gaming system.
Backstory
I had designed this so that my 4 year old son would have an actual handheld retro system that could be kid friendly. However, after I had designed, layed out, and ordered all the parts, I only found enough free time to partially populate one of them. I hate to see all of my effort go to waste, so I'm putting this out there if anyone else is interested in trying to build one, or to fork my design and improve it.
The design of this board uses a cheap 3.2" screen that runs on the Pi's GPIO pins. I've actually tested this part, and it's working as expected. I designed the controller to use membrane pads like an actual SNES controller (or similar.) The idea was that I would just take one of those cheap SNES USB game pads, and steal the buttons/pads from them, as you can see in the picture below.
The board was designed in KiCAD, and has a BOM in it that can be directly ordered from Digikey. I've also included datasheets for all the important bits in the project as well.
Here is a 3D rendering of the board, made using FreeCAD in combination with KiCAD:
And here is a picture of the actual board, with some components on it for a dry fit test:
And finally, a WIP case design I made in TinkerCAD:
Here is a link to the WIP case design in Tinkercad if anyone is interested in finishing it.
The Future
I still plan on coming back to this, but really wanted to put it up on GitHub so that the bits don't get lost to a computer or hard drive failure. I think I'll eventually get some time this fall to build and debug the boards I have. There may be a revision in the future...who knows...
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | MEMBRANE_PAD | Bentendo:membrane_button_small | S2, S3, S4, S5, S10, S11, S12, S13 |
| 5 | 0 | Resistors_SMD:R_1206_HandSoldering | R12, R13, R14, R19, R21 |
| 5 | 10K | Resistors_SMD:R_1206_HandSoldering | R4, R6, R9, R10, R15 |
| 5 | CONN_01X02 | Connectors:PINHEAD1-2 | J2, J3, J4, J7, J8 |
| 5 | Conn_01x01 | Connectors:1pin | J5, J9, J10, J11, J12 |
| 4 | 10UF | Capacitors_THT:CP_Radial_D5.0mm_P2.00mm | C8, C12, C13, C15 |
| 4 | MEMBRANE_PAD | Bentendo:membrane_button_tiny | S8, S9, S14, S15 |
| 2 | 0.047UF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C10, C17 |
| 2 | 100K | Resistors_SMD:R_1206_HandSoldering | R16, R18 |
| 2 | 10UF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C7, C11 |
| 2 | 127R | Resistors_SMD:R_1206_HandSoldering | R5, R8 |
| 2 | 220UF | Capacitors_THT:CP_Radial_D8.0mm_P3.50mm | C9, C14 |
| 2 | 270R | Resistors_SMD:R_1206_HandSoldering | R3, R7 |
| 2 | 33NF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C16, C18 |
| 2 | 47UF | Capacitors_THT:CP_Radial_D5.0mm_P2.00mm | C4, C19 |
| 2 | AD5228 | TO_SOT_Packages_SMD:TSOT-23-8_HandSoldering | U5, U6 |
| 2 | LM386 | Libraries:LM386MX-1&slash_NOPB | U3, U4 |
| 1 | 0.1uF | Capacitors_SMD:C_0805_HandSoldering | C21 |
| 1 | 0.47UF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 1 | 1.5K 1% | Resistors_SMD:R_1206_HandSoldering | R1 |
| 1 | 1.5UH | Inductors_SMD:L_Vishay_IHLP-2020 | L1 |
| 1 | 10uF | Capacitors_SMD:C_0805_HandSoldering | C22 |
| 1 | 1K | Resistors_SMD:R_1206_HandSoldering | R20 |
| 1 | 1UF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C3 |
| 1 | 1uF | Capacitors_SMD:C_0805_HandSoldering | C20 |
| 1 | 220PF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C5 |
| 1 | 22UF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C6 |
| 1 | 300K | Resistors_SMD:R_1206_HandSoldering | R17 |
| 1 | 4.7UF | Capacitors_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2 |
| 1 | 4.99K | Resistors_SMD:R_1206_HandSoldering | R2 |
| 1 | 45.3K | Resistors_SMD:R_1206_HandSoldering | R11 |
| 1 | D | Diodes_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | DUAL_MOSFET | SMD_Packages:SOIC-8-N | Q1 |
| 1 | LTC4064 | Housings_SSOP:MSOP-10-1EP_3x3mm_Pitch0.5mm | U1 |
| 1 | RT4812 | TO_SOT_Packages_SMD:SOT-23-8_Handsoldering | U2 |
| 1 | Raspberry_Pi_2_3 | Connectors:IDC_Header_Straight_40pins | J6 |
| 1 | SWITCH_FSM4JRT | Libraries:1825027-5 | U7 |
| 1 | USB_OTG | Connectors_USB:USB_Micro-B_Molex_47346-0001 | J1 |
Questions
How big is the BT DMG PCB?
It measures 163.2 × 74.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BT DMG use?
77 parts, built around the LM386. 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 BT DMG KiCad files?
From the benpocalypse/bentendo repository on GitHub, at the commit this page was made from: the board is bentendo/BT-DMG.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the BT DMG design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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