HardLabs

Bkm-129x scart vga

skumlos·bkm-129x-scart-vga

Bkm-129x scart vga PCB layout, top view — open source AVR/Arduino board by skumlos
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About the Bkm-129x scart vga PCB

Bkm-129x scart vga is an open source AVR/Arduino PCB design by skumlos, published on GitHub. It is a 2-layer board measuring 105 × 160 mm, with 67 components from 33 distinct parts.

Its main chip is the arduino-nano-v3, from the AVR/Arduino family. Other key parts include the ADG1611, THS7374, 74LVC125, MIC3490-5.0 and ATMEGA328PB-AU. By type, the board carries 30 resistors, 18 capacitors, 7 ICs, 5 connectors, 2 transistors and 2 switches.

From the project

A BKM-129X compatible with both SCART and VGA

Should be able to be created at ~$40, with the ADG1611BRUZ being the most expensive component. Note that the DG1411EEQ is pin-compatible, with a slightly higher Ron.

This requires an Arduino Nano v3 or the ATMEGA328PB mounted, which is then loaded with the latest BKM-129X-MCU code from https://github.com/skumlos/bkm-129x-mcu

The middle 4PDT switch selects SCART or VGA. The top switch selects if the VGA sync signal should combine HV to CSYNC or just feed CSYNC on. Note that CSYNC should be 75 Ohm level.

Main components on the Bkm-129x scart vga

ADG1611THS7374arduino-nano-v374LVC125MIC3490-5.0ATMEGA328PB-AULDL1117S50R

Bkm-129x scart vga bill of materials (BOM)

67 components, 33 distinct parts.

QtyPartRefs
1
ADG1611
U1
1
THS7374
U2
1
arduino-nano-v3
U3
1
74LVC125
U4
1
MIC3490-5.0
U5
1
ATMEGA328PB-AU
U6
1
LDL1117S50R
U101
1
DTC144EKA
Q1
1
MMBT3904
Q2
1
CSTNE16M0VH3L000R0
Y1
1
DB15_Female_HighDensity_MountingHoles
J1
1
SCART-F
J2
1
SJ1-353XNG
J3
1
Conn_02x32_Row_Letter_Last
J5
1
ICSP
J6
2
PBH4UEENAGX
SW1, SW2
1
RED_LED
D1
1
GREEN_LED
D2
8
0.1uF
C1, C2, C3, C4, C5, C6, C9, C12
3
100uF
C7, C8, C13
Show 13 more
QtyPartRefs
1
2.2uF
C10
3
1uF
C11, C15, C101
2
4.7uF
C16, C102
1
100nF
C17
4
10K
R1, R3, R14, R18
5
100R
R2, R21, R24, R26, R28
1
470R
R4
3
1K
R5, R15, R16
6
150R
R6, R7, R8, R32, R33, R34
1
0R
R9
4
75R
R10, R11, R12, R13
2
4K7
R19, R23
4
100K
R20, R22, R25, R27

Bkm-129x scart vga design files

The KiCad project lives in the skumlos/bkm-129x-scart-vga repository on GitHub; these links point at the commit this page was built from.

Bkm-129x scart vga: common questions

What microcontroller does the Bkm-129x scart vga use?

The Bkm-129x scart vga is built around the arduino-nano-v3, from the AVR/Arduino family.

How big is the Bkm-129x scart vga PCB?

The Bkm-129x scart vga measures 105 × 160 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bkm-129x scart vga?

67 components, from 33 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bkm-129x scart vga design files?

From the skumlos/bkm-129x-scart-vga repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Bkm-129x scart vga design in my own project?

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

Can I test firmware for the Bkm-129x scart vga without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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