[sdiy] [OT] LM13700 spotted in commercial product of big Manufacturer

[mark verbos]

hot tweezers.

I’m pretty sure I can beat that time if I use my Weller WXMT MS hot tweezers. I spread some water-clean flux on the board, put solder on all the pads and drop the 0603 resistors on. Not only could I do that PCB faster, after I wash it it looks like a machine did it. 

I’m with Roman, I think building a big through hole board belongs in one of the circles of hell. All that flipping over and having parts fall out, clipping leads, burning my fingers as I try to get the parts tight to the board, etc. Plus…. I hope to never do panel wiring again as long as I live. (I still have some original Buchla left overs to complete) Even my passion projects I build by hand with SMD and I have a pick n place machine! I do not get any TV watching in during the assembly, I listen to CNN in the background, does that count for anything?

Incidentally, I got the feeders for my desktop from that thread a few months ago. Since I was ordering them from China, I paid for 4 but they only sent me 1. It is perfect for what I need, but I won’t be doing any more business with them after they took my money and only delivered 25% of the order. I was impressed by the rig Roman offered, but I don’t know where I would put it. My desk is WAY too cluttered for such a thing. 


Mark




> On May 17, 2022, at 11:11 AM, Roman Sowa <modular at go2.pl> wrote:
> 
> OK, challenge accepted!
> 
> Partly because it's fun, partly because thought I can beat it and partly because David is nice guy, I took the challenge and tried to beat David's markup doing it in SMD, obviously without P&P.
> So for me it was 72 resistors of the same value, 0603 case. Preparing board and parts, placing them and soldering took 15 and half minutes.
> So I've lost.
> 
> But it was a valuable experience which I never did before - to measure the time needed for this. Placing components took 5 minutes, which was my biggest surprise, soldering one side 7.5 minutes and the other side plus final inspection - 3 minutes.
> Like David, I solder SMD for pleasure, so when the time flies like crazy I don't even notice it.
> 
> Roman
> 
> 
> W dniu 2022-05-16 o 18:17, David G Dixon via Synth-diy pisze:
>> You're missing my essential point:  I build electronics by hand for
>> pleasure.  I derive no pleasure from handling tiny parts that I can barely
>> see and that have to be installed on the solder side of the PCB.  I have
>> installed SMD parts on boards by hand, and it is almost impossible for me.
>> On the other hand, I have systems for making through-hole PCBs and
>> installing through-hole parts that make it a snap to do.  I'm actually a bit
>> of a through-hole ninja.  For example, in one of my common builds, I require
>> 60 10k resistors on two PCBs.  I can prepare and stuff those resistors in
>> less than 10 minutes, while watching TV at the same time.  I defy anyone to
>> do that with SMD resistors without a pick-and-place machine.
>>  -----Original Message-----
>> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Mike
>> Bryant
>> Sent: Monday, May 16, 2022 3:20 AM
>> To: Gordonjcp; synth-diy at synth-diy.org
>> Subject: Re: [sdiy] [OT] LM13700 spotted in commercial product of big
>> Manufacturer
>> [CAUTION: Non-UBC Email]
>>> Conversely, I pretty much gave up on constructing electronics until I got
>> into doing SMD, because through-hole is such a fiddly pain in the arse to
>> deal with.  SMD is so much easier.
>>> Gordon
>> Same here.   MUCH easier to get an assembly house to make it up for me :-)
>> And at the prices JLCPCB charge for assembly it's now often cheaper to do a
>> re-spin than spend hours performing major surgery to a first prototype.
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