Electronics related projects, information,
PAL/NTSC PC Keyboard Video Overlay Generator
As published in the October 1999 edition of Electronics Australia
The Help screen displayed by the VTG-01. A capability
of what it can do.
Text can be 4 different sizes, along with special characters.
The VTG-01 with the case open. As you can see, a very
The 5way DIN plug connects to a standard IBM AT keyboard.
Perfect low cost solution for :
- Home video titling
- SSTV transmitters
- HAM Amateur TV systems
- Security video installations
- Scientific experiment recording
The VTG-01 is designed to display user defined text over a composite
video signal. This is useful in a multitude of different applications
such as adding titles to home movies and adding custom text to security
videos. Text can be displayed in different sizes almost anywhere on
the screen. Text entry and editing is done by way of a standard IBM
Cost & Availability:
- Lowest possible cost
- Completely standalone, only an IBM AT keyboard, no computer required.
- Compact size 120mm x 60mm x 30mm (PCB only - 90mm x 48mm)
- Powered from a single 9-15V DC (300mA) power source (2.1mm DC socket)
- Connects to a standard IBM AT compatible keyboard (not XT compatible)
- Clear legible text with transparent background
- Selectable black text border for a clearer text image.
- 4 Selectable text sizes horizontal and vertical (only one text size per
- Text can be zoomed in in the X and/or Y directions to four levels
- Adjustable horizontal and vertical text window position
- 11 rows x 27 character display
- Selectable on-screen row cursor
- Automatic text brightness adjustment, set to 75% white level.
- 75ohm RCA composite video input
- 75ohm RCA composite video output (includes a DC offset)
- Colour or B/W compatible.
- 8MHz video bandwidth
- Can be ordered in PAL or NTSC versions
Even though the STV5730A chip has been reinstated
into full production I will no longer be selling the chip or this project.
I do not have any PCB's or chips available.
Another Titler :
Bob Barnes from RCS Radio has designed an alternative PCB for this project
which is available now for $14.50AU. He also has an alternative (non keyboard)
design. Click here
for more details. NOTE - This is not a Tronnort design, I had nothing
to do with it and I have not tried it myself so I do not support it.
If you want an RS-232 interface SimmStick platform text generator then take
a look at the DT-108 from
Want a Time & Date Display? :
Take a look at my VCG-01 video clock.
Is it available fully assembled ?
I do not sell this kit, so unfortunately cannot supply it ready assembled.
What if it Doesn't Work? :
NOTE : There is a chance that the VTG-01 firmware will not be compatible with
some AT keyboards. I haven't found one yet that doesn't work but every keyboard
is different so I cannot guarantee it 100%
Home - electronics.alternatezone.com
David L. Jones