2 layers118 × 100 mm
MN12932L Teensy4
mariosgit/VFD
Drivers for a bunch of VFD displays, like the MN12832, ...
50 parts27MIT
2 layers178.3 × 100.1 mm
GP1294-Teens4
mariosgit/VFD27Drivers for a bunch of VFD displays, like the MN12832, ...
- Size
- 178.3 × 100.1 mm
- Copper layers
- 2
- Thickness
- 1.67 mm
- Parts
- 106
- Nets
- 101
- Pads
- 402
- Tracks, vias
- 1,023, 157
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 25 Apr 2018
- Updated
- 13 Aug 2026
Overview
GP1294-Teens4 is an open-source printed circuit board by mariosgit, from the mariosgit/VFD repository on GitHub, published under the MIT licence. It is a 2-layer board of 178.3 × 100.1 mm with 106 parts on 101 nets, routed with 1,023 tracks and 157 vias.
It is built around the R-78B5.0-2.0, ZXBM5210-S and 74HC165D, with the 74132DC and 1N4448W among its other parts. Its parts include 34 capacitors, 22 resistors, 13 ICs, 8 diodes and 5 switches. It belongs with the lEDs and displays boards of this library.
Main components
5
R-78B5.0-2.0
SIP-3-40℃~+70℃ 1 11.5mm 17.5mm 2A 2mA 460kHz 5V 6.5V~32V 75mVp-p 8.5mm 820uF 94% Regulated type Short Circuit Protection、Automatic fault recovery SIP-3 Isolated Power Modules ROHSRECOM PowerIsolated Power Modules
ZXBM5210-S
SO-8-40℃~+85℃ 1.5A 1.72Ω 3V~18V 850uA Interleaved conduction protection、Current sensing/regulation function、Active braking function SO-8 Brushed DC Motor Drivers ROHSDiodes IncorporatedBrushed DC Motor Drivers
74HC165D
SO-16-40℃~+125℃ 1 28ns@6V,50pF 2V~6V 35MHz 500mW 74HC 8 Parallel or Serial to Serial SOIC-16 Shift Registers ROHSNexperiaShift Registers74132DC
CDIP-140℃~+70℃ 1.1V 16mA 16mA 22ns@5V,15pF 2V 4 4.75V~5.25V 40mA NAND Gate Schmitt trigger CDIP-14 Logic GatesTexas InstrumentsLogic Gates
1N4448W
SOD-1231 Independent 1.25V@150mA 2.5uA 2A 4ns 500mA 500mW 75V SOD-123 Switching Diodes ROHSGuangdong HottechSwitching Diodes
README
PCB-KiCad/README.mdPCB's
Reminder
To edit a schematic/pcb, open the .pro file first (double click) KiCad needs this to handle sch/pcb together, otherwise u get wiered errors when updating pcb from schematic.
GP1294 panel
| front | back |
|---|---|
 |  |
A Panel with that display and an Teensy4.
Intended Use: Graphical EQ. The bottom PCB is a FreeDSP-AllInOne.
- Infopage https://freedsp.github.io/
- Github: https://github.com/freeDSP/freeDSP-ALLinONE
Contains
- Power for VFD (~3V fillament, 30-50V for anode and grid) and 5V for other stuff.
- Teensy4 - Controls the Amp and shows vintage spectrum analyser.
- 2 Encoders
- 5 Buttons.
Status
Tested, has bugs... Can be patched to work somewhat.
Bugs
- VFD pin 9 (TEST) must have 100k pullup to 3.3V and small buffer C.✅
- SDA/SCL are twisted ! ✅
- PL(atch) is not connected to ATTiny ! Removed ATTiny ✅
- ATTiny fliegt raus, zu umstaendlich.✅
- I2S pins wrong, fixed + SRCs ✅
- 5V reg wrong footprint (from a kicad lib)
- Add revision info
- Crosscheck wiring with proto
Bugs
- RECOM 5V reg wrong footprint (from a kicad lib)
- VFD pin 9 (TEST) must have 100k pullup to 3.3V and small buffer C.
Todo
-
Test audio connection to/from teensy I2S slave ! Can it do USB playback ? T3.2 or T4.0 ?
-
FreeDSP-AIO flaws ✅
- speaker mute before shutdown...
- it has a startup unmute circuit but no shutdown...
- One more7414 gate and 2 diodes and 2 resistors... ... voltage divider at the schmitt input set to trigger when Vin goes below 8V or so !? then OR that output via 2 diodes into the spk_sleep. Adjust: turn pot from full (cw) towards 0 (ccw) until the mute LED goes off.
- tested ✅
- Not much capacitance at Vin, more caps ! Could delay the shutdown ! More time to mute ! ✅
- speaker mute before shutdown...
MN12832L panel
| front | back |
|---|---|
 |  |
Eurorack 24U format - 12cm width. Made for some very specific recycled receiver knobs.
Status
Batch v0.1 ordered.
BOM
| "Id" | "Designator" | "Footprint" | "Quantity" | "Designation" |
|---|---|---|---|---|
| 15 | "U3,U4" | "SOIC-16_3.9x9.9mm_P1.27mm" | 2 | "74HC165" |
| 34 | "U1" | "MN12832L" | 1 | "~" |
| 30 | "U2" | "Teensy4.0" | 1 | "~" |
| 23 | "U5" | "Converter_DCDC_RECOM_R-78E-0.5_THT" | 1 | "R-78B5.0-2.0" |
| 29 | "IC2" | "SO8" | 1 | "ZXBM5210" |
| 17 | "IC1" | "SO14" | 1 | "74132D" |
| 18 | "IC3" | "TO263-5" | 1 | "XL6009" |
| 2 | "D5,D4,D3,D2" | "D_SOD-123" | 4 | "1N4448W" |
| 16 | "D1" | "D_SOD-123" | 1 | "1N5818" |
| 14 | "L1" | "L_Cenker_CKCS5020" | 1 | "SM-NE45" |
| 22 | "L2" | "L_Cenker_CKCS8040" | 1 | "22uH" |
| 1 | "C1" | "C1206" | 1 | "4.7n" (FF-Freq) |
| 10 | "C4" | "CP_Elec_6.3x5.8" | 1 | "47u/35v" |
| 12 | "C6" | "CP_Elec_6.3x5.8" | 1 | "4.7u/100v" |
| 13 | "C3,C5" | "C_1210_3225Metric_Pad1.33x2.70mm" | 2 | "1u/100v" |
| 33 | "C2" | "C_0603_1608Metric_Pad1.08x0.95mm" | 1 | "1u" |
| 4 | "R2,R1" | "R_0603_1608Metric_Pad0.98x0.95mm" | 2 | "2.7k" (R2-FF-Freq) |
| 5 | "RN4,RN3,RN1,RN2" | "R_Array_SIP5" | 4 | "R_Network04" |
| 25 | "R14,R13" | "R_0603_1608Metric" | 2 | "2.2k" |
| 11 | "R6" | "R_Axial 10mm" | 1 | "91k" |
| 24 | "R4" | "R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm" | 1 | "91k" VoltReg |
| 31 | "R5" | "R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm" | 1 | "2k" |
| 9 | "R3" | "0411_15" | 1 | "22" 5W |
| 35 | "SW3,SW2,SW1,SW4,SW5" | "RotaryEncoder_Alps_EC11E" | 5 |
Refs
Used Kicad 3d models:
- models https://gitlab.com/MountyRox/kicad-packages3D.git
- sources https://gitlab.com/kicad/libraries/kicad-packages3D-source.git
Reminders
Start more Kicad instances on MacOS:
open -n -a "kicad"Parts
106| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 10n | VFD-Power:C1206 | C7, C10, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29 |
| 6 | 100 | Resistor_SMD:R_0603_1608Metric | R7, R8, R9, R10, R17, R18 |
| 5 | 1N4448W | Diode_SMD:D_SOD-123 | D2, D3, D4, D5, D6 |
| 5 | SW_DPDT_x2 | VFDs-Library:SwitchMS500Ecut | SW1, SW2, SW3, SW4, SW5 |
| 4 | R_Network04 | Resistor_THT:R_Array_SIP5 | RN1, RN2, RN3, RN4 |
| 3 | 100n | VFD-Power:C1206 | C2, C6, C15 |
| 3 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C30, C31, C33 |
| 3 | 91k | VFD-Power:R1206 | R6, R13, R15 |
| 2 | 10 | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | 10u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C32, C34 |
| 2 | 1u/100v | VFD-Power:C1206 | C13, C14 |
| 2 | 2.2k | Resistor_SMD:R_0603_1608Metric | R11, R12 |
| 2 | 2.7k | VFD-Power:R1206 | R1, R4 |
| 2 | 390 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R23, R24 |
| 2 | 4.7u/100v | Capacitor_SMD:CP_Elec_6.3x5.8 | C11, C12 |
| 2 | 74HC165 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U6, U7 |
| 2 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC12E-Switch_Vertical_H20mm | ENC1, ENC2 |
| 2 | ~ | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U11, U12 |
| 1 | +3.3V | TestPoint:TestPoint_Pad_2.0x2.0mm | TP3 |
| 1 | +5V | TestPoint:TestPoint_Pad_2.0x2.0mm | TP2 |
| 1 | 0 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP15 |
| 1 | 1 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP14 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R19 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R20 |
| 1 | 10u | VFD-Power:153CLV-0807 | C3 |
| 1 | 14/A0 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP4 |
| 1 | 15/A1 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP5 |
| 1 | 1N5818 | Diode_SMD:D_SMA_Handsoldering | D1 |
| 1 | 1u | VFD-Power:C1206 | C9 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4 |
| 1 | 2 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP13 |
| 1 | 22 | VFD-Power:0411_15 | R5 |
| 1 | 22uH | VFD-Power:DR125 | L4 |
| 1 | 25-33V | TestPoint:TestPoint_Pad_2.0x2.0mm | TP16 |
| 1 | 2k | VFD-Power:R1206 | R14 |
| 1 | 3 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP12 |
| 1 | 4 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP11 |
| 1 | 4.7n | VFD-Power:C1206 | C1 |
| 1 | 45-75V | TestPoint:TestPoint_Pad_2.0x2.0mm | TP1 |
| 1 | 47u/35v | Capacitor_SMD:CP_Elec_6.3x5.8 | C8 |
| 1 | 5 | TestPoint:TestPoint_Pad_2.0x2.0mm | TP10 |
| 1 | 5.1k | Resistor_SMD:R_0603_1608Metric | R16 |
| 1 | 60-99V | TestPoint:TestPoint_Pad_2.0x2.0mm | TP9 |
| 1 | 74132D | VFD-Power:SO14 | IC1 |
| 1 | ALS-PDIC144 | LED_THT:LED_D3.0mm_Clear | Q1 |
| 1 | C-EUC1206 | VFD-Power:C1206 | C5 |
| 1 | Polyfuse | Fuse:Fuse_2920_7451Metric_Pad2.10x5.45mm_HandSolder | F1 |
| 1 | R-78B5.0-2.0 | Converter_DCDC:Converter_DCDC_RECOM_R-78B-2.0_THT | U3 |
| 1 | SM-NE45 | VFD-Power:SM-NE45 | L1 |
| 1 | TSOP34S40F | OptoDevice:Vishay_MOLD-3Pin | U10 |
| 1 | ZXBM5210 | VFD-Power:SO8 | IC3 |
| 1 | rdy-in | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D8 |
| 1 | rdy-out | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D9 |
| 1 | ~ | FreeDSP:FreeDSP-allinone | U4 |
| 1 | ~ | VFD-Power:TO263-5 | IC2 |
| 1 | ~ | VFDs-Library:OLED5.5 | U9 |
| 1 | ~ | VFDs-Library:GP1294AI | U1 |
| 1 | ~ | VFDs-Library:CaseDD | Case1 |
| 1 | ~ | VFDs-Library:Teensy4.0_smd | U2 |
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Questions
How big is the GP1294-Teens4 PCB?
It measures 178.3 × 100.1 mm and has 2 copper layers, 1.67 mm thick.
What parts does the GP1294-Teens4 use?
106 parts, built around the R-78B5.0-2.0, ZXBM5210-S, 74HC165D and 74132DC. 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 GP1294-Teens4 KiCad files?
From the mariosgit/VFD repository on GitHub, at the commit this page was made from: the board is PCB-KiCad/GP1294-Teens4.kicad_pcb and its schematic PCB-KiCad/GP1294-Teens4.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the GP1294-Teens4 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).