Grape 1 build

[Todd Christell]

I got back from vacation and finally got to my Grape 1 build. I made a couple of notes in case it helps anyone else doing this build. 

I used an AmScope SM-4TZ-144A microscope and a Hakko 951-66 soldering station with a FM2032-51 Micro Soldering Hand piece and Hakko micro R0.2mm/40x3mmx3mm bent, solder tip. 

I didn’t do an initial inventory of the parts that I ordered. Somehow I failed to order the 2200pf capacitor and when I opened the envelope with the 1K resistors the tape was empty. I had both in inventory so didn’t slow things down. It was a pretty easy and fun build, took between 3 and 4 hours. I made a spreadsheet with the component labels, value and Digi-Key/Mouser stock numbers so that could double check each component as I added them. I started with caps, then resistors, ICs, inductors and finally the through hole components. The only fiddly component was D1 – both it and the pads are TINY. I heated a spot of flux on the board and used it to “glue” the diode package in place while I tacked one of the leads. All but one of the inductors were covered so to make sure I had good connection I put a very thin layer of solder on both circuit board pads then flowed them with the inductors in place. 

Something about the lighting on my scope made the slanted edge of IC1 hard to see and I had to rotate it around a bit to confirm. 

I also placed headers on the audio out and vin for a little more flexibility. 

73, 

Todd 

AD0RR

[David Waugh]

Congratulations on getting it built! I had never soldering something so small before, I also worked under a microscope. Do you have it running yet? -David

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[Todd Christell]

Hi David: Thanks. I thought it was a nice challenge, especially D1!!

I'm now working on configuring the PI. Hard to find all of the documentation and the PI seems to have a problem reading my Bodner GPSDO. I have the two port model so that may be part of the problem. I'll probably post it here for some help. 

Are you gathering data yet?

Todd

AD0RR