Suddenly my 40-meter yagi at the end of a long feedline started showing a very high SWR. The antenna looked good using binoculars. So where was the problem? Lots of the transmission line cable was buried underground.
This handy TDR pulse generator exactly determined the location where the defective connector was located. Turns out to have been just after the antenna switch located at the base of the tower.
I bread-boarded two projects for my neighbor's Lionel Train Set and then I saw this option which would have saved me time, especially since I had to procure bare PCB breadboard. I bought two for my next unknown projects just because it will make it easy. Mike Heslop
Sorry for the problem. I'm not sure what the issue you had was. The Raspberry Pi only has one serial port connection on the connector. Transmit is on pin 8 and receive is on pin 10 of the Raspberry Pi connector. See the pinout on this page -
If it's the serial port on your computer that is the question then we gave the information on how to run Device Manager (assuming you are running Windows on your computer) on our documentation page.
I backed this device on Kickstarter and then I bought 4 more from Tindie. I usually use a USB-TTL cable but this makes easy enough that I don't have to keep reminding people what order the pins go in. Just snap it on, install the driver, and plug in to your USB port.
I bought the bare board because I wanted to practice my SMT soldering AND because the populated board was back-ordered. Unfortunately, I only skimmed the available documentation - "Hey, here's a board layout and a list of parts!" - before ordering. The next day when I tried to order from the list of parts I discovered many were vaguely specified: fuse 0805, LED 0805, etc. What current rating for the fuse? What current rating for the LED? What package for the EEPROM?
About 3/4 of the parts are completely specified. The other 1/4 are underspecified.
Since I cannot tell if the product works, I am unsure on how to rate it. I also have not followed up with the vendor to see if there is more information available. I rated both mid-pack.
Sorry that you had some difficulty in determining what parts should be used on the bare board. Sounds like you found our Assembly Sheet page at: http://land-boards.com/blwiki/index.php?title=Beaglebone_Black_Assembly_Sheet
It is true that not all part numbers are specified in detail on that sheet. Hopefully we can help:
EEPROM PN: CAT24C256WI-GT3 Fuse: PTS120615V050 (it is in a 1206 package not an 0805 as indicated above). 1/2 Amp fuse. LEDs are typical 0805 red LEDs. The series resistor value is specified on the assembly sheet. PN: LTST-C170KRKT
If you need help with parts other than these three, please reach out and let us know.
As advertised. Very fast rise time and clean waveform. Optional enclosure might be nice but no obstacle for the tinkerer. If you are expecting loads of documentation the designer is expecting that you know what you are ordering! :)
This small circuit board produces a 50 ohm square wave with a frequency of about 300 Hz. I have an ultrasound application that requires a sharp pulse like edge, rise time of 5 ns or so. When I connect the circuit to a 5V DC supply, I get an almost 5 V step in something like 2 or 3 ns.
I've been using this board for a few days now and have not had any trouble.
Function generators that can generate this kind of sharp edge at 50 ohms cost a lot more than this little board, take up more space and use more power.