4 layers130 × 105 mm
Vm101-inout
mirdej/vmix
Multichannel modular analog PAL video mixer based on the SYNKIE project
238 parts21
2 layers42 × 35 mm
Vm108-busbuffer
mirdej/vmix21Multichannel modular analog PAL video mixer based on the SYNKIE project
- Size
- 42 × 35 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 16
- Pads
- 43
- Tracks, vias
- 58, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 20 Aug 2020
- Updated
- 5 Dec 2024
Overview
Vm108-busbuffer is an open-source printed circuit board by mirdej, from the mirdej/vmix repository on GitHub. It is a 2-layer board of 42 × 35 mm with 11 parts on 16 nets, routed with 58 tracks and 0 vias.
It is built around the 74HC244D. Its parts include 4 connectors, 1 capacitor and 1 IC.
Main components
1README
README.mdANYMIX 21
Multichannel modular analog PAL video mixer based on the SYNKIE project
The Anymix21 is a 12 channel analog video mixer based on the paradigm of classic audio mixing desks.
Each channel is a complete SYNKIE by itself, sort of. It can handle anything from DC to around 10Mhz, this means you can mix CV signals with audio with PAL composite video signals. Contrary to an audio mixer, inputs are DC coupled, with 0v being black and 0.7V white level. Negative levels are permitted but will be clipped at the final output stage.
Each channel has a built-in equaliser, switchable edges (bandpass), comparator and inverter effects, and a scale-bias module for adjusting brightness and contrast. The signal can then be routed to 3 main output mix busses and an auxiliary output.
Apart from the equalizer, the effects and mix levels are digitally controlled analog, so parameters can be recorded, automated, or controlled externally through MIDI. The desk can be synchronized to a MIDI clock (which is then quantized to the vertical blanking interval derived from the genlock input).
Still under construction, the first 6 channels have passed their endurance test running daily for weeks at the exhibiton “H.o.Me. – Heim für obsolete Medien” at Kunsthaus Langenthal.
Documentation
- Architecture Overview
- Mixer Channel: Flowchart and description
- Master Section: Flowchart and description
Links
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3, H4 |
| 3 | Sync-Bus | synkie_footprints:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J2, J3, J4 |
| 1 | 74HC244 | Package_SO:SO-20_12.8x7.5mm_P1.27mm | U1 |
| 1 | C | synkie_footprints:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C1 |
| 1 | Ferrite_Bead | synkie_footprints:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1 |
| 1 | Supply | synkie_footprints:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J1 |
Questions
How big is the Vm108-busbuffer PCB?
It measures 42 × 35 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Vm108-busbuffer use?
11 parts, built around the 74HC244D. 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 Vm108-busbuffer KiCad files?
From the mirdej/vmix repository on GitHub, at the commit this page was made from: the board is electronics/vm108-busbuffer/vm108-busbuffer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Vm108-busbuffer design in my own project?
Its repository states no licence, so its author keeps all rights: ask mirdej before reusing the design.
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