GeorgeP Posted April 29, 2016 Report Share Posted April 29, 2016 ^ any recommendations on a good crimper? Quote Link to comment Share on other sites More sharing options...
gepardcv Posted April 29, 2016 Report Share Posted April 29, 2016 I found this one, official Molex but much cheaper than the $300 specialty "premium grade" tool. Still worried about the 250V rating, though. Quote Link to comment Share on other sites More sharing options...
UFN Posted April 29, 2016 Report Share Posted April 29, 2016 If you want something universal then I can recommend the ones from http://www.engineer.jp/index_e.html Universal for small JST/Molex connectors with 2.0mm/0.1"/0.15" pitch: http://www.engineer.jp/en/products/pa21e.html Larger model for FAST-On style connectors (cable shoes I think they are called?) etc: http://www.engineer.jp/en/products/pa01_04e.html (the PA-01 model) Should be available on eBay etc. (unless you know anyone going to Japan where the prices are much lower ). //UFN Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 29, 2016 Report Share Posted April 29, 2016 Does anyone have a bare board for the original group buy digital attenuator. I've got parts for another, but no board (not good planning). I wanted to build it so I can test the controller software for balanced operation. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted April 30, 2016 Report Share Posted April 30, 2016 I have some, but I am not sure how accessible they are. I am on vacation in FL, when would you need them by? Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 30, 2016 Report Share Posted April 30, 2016 (edited) No rush. I just need one, so let me know when you get back. Thanks Edited April 30, 2016 by Kerry Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted April 30, 2016 Report Share Posted April 30, 2016 On 4/29/2016 at 1:50 AM, spritzer said: These are sad days indeed. We should all be using opamps for everything... I'm sure somebody will make high performance parts for us but they won't be as cheap as the K389/J109 were back in the day. Apart from the 2SK170/LSK170 the lowest noise n-channel FET I've found is the BF862 with 0.8nV/rootHz. This is a 700MHz surface mount device and is made in the bucket load, and is a factor of several cheaper than the LSK170. The key it seems is to chose RF devices in which noise sources with low impedance drive (like an antenna) are important. Difficulty of course is finding complementary devices - the closest are the current offerings from Linear Systems. At least they do the LSK389 - if they eventually produce the LSK109 (they took long enough to crack the LSJ74 fab problem!) that would be nice indeed. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted May 2, 2016 Report Share Posted May 2, 2016 i think i have a bare board, will look later Quote Link to comment Share on other sites More sharing options...
Kerry Posted May 2, 2016 Report Share Posted May 2, 2016 Thanks Quote Link to comment Share on other sites More sharing options...
mwl168 Posted May 3, 2016 Report Share Posted May 3, 2016 Has anyone tried using denatured alcohol to clean the flux residual off the PCB? Is it safe for the PCB and solder joints? Thanks! Quote Link to comment Share on other sites More sharing options...
muskyhuntr Posted May 3, 2016 Report Share Posted May 3, 2016 I have used denatured alcohol on my boards for years, as have others, and have never had a problem. I use the highest % I can find. Note that it will take multiple washings and scrubbings with a tooth brush to clean the board. Also, it helps to wipe off the board with a paper towel between washings, other wise the resin desolved by the alcohol will remain on the board. Me Quote Link to comment Share on other sites More sharing options...
nopants Posted May 3, 2016 Report Share Posted May 3, 2016 yeah in my limited experience it's come down to the elbow grease and proper rinsing. took me days to properly clean the t2 boards Quote Link to comment Share on other sites More sharing options...
mwl168 Posted May 3, 2016 Report Share Posted May 3, 2016 Thanks for the information. I usually use a metal pick to remove the hardened flux residue followed by scrubbing with 90% isopropyl alcohol but it always leaves a residue. I am guessing it's the additive in the alcohol I use. I'll give this denatured alcohol a try. Quote Link to comment Share on other sites More sharing options...
gepardcv Posted May 3, 2016 Report Share Posted May 3, 2016 I use this: http://www.amazon.com/MG-Chemicals-Isopropyl-Alcohol-Cleaner/dp/B004SPJP5O Still takes several cycles to get a PCB clean enough. Not looking forward to doing this with T2 boards. Quote Link to comment Share on other sites More sharing options...
PICaudio Posted May 3, 2016 Report Share Posted May 3, 2016 I prefer a mixture of Isopropyl Alcohol and Acetone (60/40), IMHO I think this mixture clean more easily that if you use Isopropyl only Quote Link to comment Share on other sites More sharing options...
oogabooga Posted May 4, 2016 Report Share Posted May 4, 2016 I found 100% isopropanol to work well, and wiping it off while still wet like muskyhuntr says helped eliminate residues. Quote Link to comment Share on other sites More sharing options...
JoaMat Posted May 4, 2016 Report Share Posted May 4, 2016 Anyone tried dishwasher? Quote Link to comment Share on other sites More sharing options...
mwl168 Posted May 5, 2016 Report Share Posted May 5, 2016 16 hours ago, JoaMat said: Anyone tried dishwasher? Actually, I read on DIYAUDIO someone did use dishwasher to clean PCB and said it works well. IIRC, it says to use the gentle cycle Quote Link to comment Share on other sites More sharing options...
JoaMat Posted May 5, 2016 Report Share Posted May 5, 2016 Once I cleaned a straight six BMW cylinder head in dishwasher. Very handy. Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted May 5, 2016 Report Share Posted May 5, 2016 3 hours ago, JoaMat said: Once I cleaned a straight six BMW cylinder head in dishwasher. Very handy. And what did your partner say about that then Quote Link to comment Share on other sites More sharing options...
wink Posted May 7, 2016 Report Share Posted May 7, 2016 He was ahead of his time..... 1 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted May 14, 2016 Report Share Posted May 14, 2016 On 2016-05-05 at 1:19 PM, Craig Sawyers said: And what did your partner say about that then Don’t remember the exact words, but she is a very adorable partner. Got this as a present recently……… 3 Quote Link to comment Share on other sites More sharing options...
UFN Posted May 14, 2016 Report Share Posted May 14, 2016 Well, she definitely has excellent taste If she's also tolerant of vast quantities of diy audio parts and gear then she's probably a keeper //UFN Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted May 18, 2016 Report Share Posted May 18, 2016 I just bought now OOP p-ch surface mount JFETs - that seems a bit crazy. 1 Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted May 18, 2016 Report Share Posted May 18, 2016 Can anyone recommend a good surface mount, dual polarity, >50V, high hfe, in a power package that can do > 0.5W per package? I am looking at the PBSS4160PANPS but want more gain, if I can. Quote Link to comment Share on other sites More sharing options...
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