World of Jani’s latest post introduces a DIY 15kHz VGA Monitor Tester, perfect for retro fans and hardware hobbyists. Amiga and Atari ST computers use a 15kHz horizontal frequency that most modern monitors can’t handle. Finding one that works often feels like a guessing game at thrift stores. This portable tester solves that problem by letting users check compatibility before making a purchase.
Originally based on an idea from Planeturban, Jani’s version is easier to build and program. It runs on an LR23 battery, chosen for its availability and convenience. A small power switch controls the device, while a single button switches video modes. Users can load Urban’s VGA color pattern software or Beel1’s multi-mode version, which adds three Atari settings. Holding the button for ten seconds toggles between modes.
The project is simple enough for hobbyists with basic electronics experience. It uses an Arduino Nano, a VGA/DB15 connector, and a tactile button, all available from AliExpress. A few resistors, a power switch, and a battery holder complete the build. Jani even provides the PCB layout, which can be ordered directly from PCBWay.
Better yet, Jani links to online databases listing compatible 15kHz monitors. These include resources like 15khz.miraheze.org and GitHub’s 15kHz monitor list. With these tools, users can easily confirm whether their vintage display supports the required frequency.
Overall, the guide offers a handy and reliable way to test displays for vintage systems. It’s a small, affordable tool that saves time, money, and frustration for anyone restoring old computers.
