Several years ago I designed a little circuit board called the T2-Mini that provides life support for one of Tom Van Baak’s very wonderful picDIV PIC-based frequency dividers. The idea is to convert the 1, 2.5, 5, or 10 MHz output from a frequency standard to a one pulse-per-second (PPS) signal for use in frequency stability measurements.
I don’t do things in a small way, so I built a rack enclosure (using the Front Panel Express service to hold 8 T2-Minis.
What’s really cool is that an Arduino Mega 2560 using a repurposed TAPR TASS-Shield board controls the T2-Minis. Via a USB connection, you can set the operating frequency of each board independently, and also control their synchronization to an external pulse — you can sync each board individually, or the group simultaneously.
The code is on github at https://github.com/n8ur/T2M-ctl.
Here are some pictures of the enclosure