High Frequency filters of the high-pass/low-pass topology. Typically these are used for wider pass-bands, such as one octave. Cauer/elliptic responses provide good out-of-band rejection with minimal inductors. A latching relay provides a bypass path to allow cascading of the filters. Full details and measure responses are at http://www.janbob.com/electron/FilterBP1/FiltBP1.html Use of this board via OSH Park orders is unrestricted.

SDR Control Box PCB with Teensy 3.6 processor. Supports most SDR with knobs, buttons and 320x240 display.. Details are available here. Use of this board via OSH Park orders is unrestricted.

There are many digital and analog signal pads on the back side of the PJRC Teensy 3.6 processor board. This board makes a portion of those pads accessible as 0.1-inch spaced header-ready pads. This board solders to the bottom of the Teensy board and extends the length by 0.3-inch. See https://forum.pjrc.com/threads/48553-Accessing-bottom-pads-on-T3-6 for more information. License: Usage through OSHPark orders is not limited.

Audio Vector Network Analyzer using the Teensy 3.6. Info is at the project Web site.