Products > Test Equipment

LCR Cal Test PCB

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watchmaker:
OK Josh, I am ready to populate your board.

My first attempt at SMDs.  Thankfully I am used to screws smaller than 402.  All the ckt does is running lites, but it gave me confidence.  The trace from pin 7 of the 555 to the caps was bad; that took more time than soldering.

I even replaced the 555 before finding the issue.  Now I know I can desolder as well.

You certainly need tweezers for measuring SMD caps.

Was trying to figure out what EEE stood for until I realized it 333!  Lot to learn.

KungFuJosh:

--- Quote from: watchmaker on October 12, 2024, 07:41:07 pm ---My first attempt at SMDs. 

--- End quote ---

I've done a few of those test/learning boards before I got into SMT. It really is helpful.

The good news is that my LCR boards are generally hand-solder pads, so you have extra room to solder if you don't have hot air.

Thanks,
Josh

Martin72:

--- Quote ---I've done a few of those test/learning boards before I got into SMT. It really is helpful.

--- End quote ---

I still remember my first attempt over 10 years ago....
Test board, SMD solder paste applied, then various 1206 capacitors placed on the corresponding pads.
And then I switched on the “SMD hot air tool” from the lab, held it on - and all the capacitors blew away with it....

KungFuJosh:

--- Quote from: Martin72 on October 12, 2024, 08:36:13 pm ---I still remember my first attempt over 10 years ago....
Test board, SMD solder paste applied, then various 1206 capacitors placed on the corresponding pads.
And then I switched on the “SMD hot air tool” from the lab, held it on - and all the capacitors blew away with it....

--- End quote ---

 :-DD Classic!

The boards I used went down to 0402 and 0603. I watched a youtube video before attempting, and it said to be careful of the hot air pressure. 😉

watchmaker:
Interesting.  I do have a got air gun but I just used my Ersa Pico.  I put some solder on one pad, pinned one end or one leg and did the other(s) and went back.

Also used flux paste applied with toothpick at times.

What are the ways this task is done?  Given the cost differential, I can see the advantages of SMDs.  OTOH, not sure I want to go down the rabbit hole of PCB design.  I wonder if I could do something using protoboard?

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