Bruno's paper has been linked at least once in this thread too, not sure why anyone thinks open loop bandwidth matters. 😕
Our solder ladies bragged that they could solder the smallest parts.
I handed them my Murata 01005 starter kit. That silenced them quickly. 😱
Personally, I now have a dual Metcal station with the ultra-fine pen since 3 weeks.
I'm angry that I did not spend the €1000 ten years earlier. All that grief
with the weller WTCP-81-bits that only wetted 2 mm above the tip point.
And heat without end, and when it is on the stand it simply stays cool - no oxidation.
I'm
happy with that Metcal.I also have now a lab scale vapour phase solder machine. Just big enough
for double Eurocards (160*233.4mm). Not yet really tested, but no fear
of BGAs any more.
regards, Gerhard
Last edited:
Our solder ladies bragged that they could solder the smallest parts.
I handed them my Murata 01005 starter kit. That silenced them quickly. 😱
Personally, I now have a dual Metcal station with the ultra-fine pen since 3 weeks.
I'm angry that I did not spend the €1000 ten years earlier. All that grief
with the weller WTCP-81-bits that only wetted 2 mm above the tip point.
And heat without end, and when it is on the stand it simply stays cool - no oxidation.
I'm
regards, Gerhard
Yes, at the office we use Metcal MX5200s. Not cheap but worth it.
0402 is very easy if you have a visual aid. 0201 is not that bad if you have steady hands, but the parts are easy to lose. 01005 haven't tried but probably very frustrating to place.
008004 chip device shown next to more normal SMD components, 0402 and 0603 packages (scale is 1mm long the size of an 0402 chip device). Our sample kit lasted all of a few seconds, everyone wanted to try an hold one... trouble is they look like a bit of dust and are soon lost... and breathing on them causes havoc, possibly the only devices you have to worry about inhaling.
The great thing about CAD is you can zoom in...
The great thing about CAD is you can zoom in...
Attachments
Have you ever used a Lynx Dynascope eyepiece-less microscope? It was once you see it you have to have it.
Quality stereo inspection microscope | Lynx Dynascope
Nope, looks pretty nice though. I have used an eyepiece-less microscope but not stereo.
I use this one:
< Zoom-Stereo-Mikroskope >
Does its job well. The F1 Halogen cold light source for the ring light is noisy.
The stage could be larger.
But the microscope does not break the bank account.
+1 for the metcal. I am not skilled enough to really justify it, but makes everything easier.
Got a related question. If I am using op-amps as unity gain buffers, in a crossover, what op-amps would you suggest I try? Currently using LM310s as the buffers for my high pass circuit, but these are an older design. Anything better in the 8 pin format? Dual would be nice, but I could always rebuild the circuit for an improved part.
DIP8 package, I take? LM310 is BJT-input, and assuming you have passive, line level filters in between buffers, then something with a little output oomph would be good. You'll need to adjust your layout to deal with the pins and connect the opamp correctly.
LME49720 has a decent OPS, can be readily configured in a unity-gain, and is available in a DIP8. You absolutely want to make sure there is local PSU bypass, per DS. It's a very good catch-all BJT opamp. OPA1602 as a safe, boring choice (read: works) as well.
As an all-purpose JFET-input opamp, OPA1642 is nice. SOIC8, though, so you'd need a adapter board. OPA2134 is another option, and available in DIP8.
LME49720 has a decent OPS, can be readily configured in a unity-gain, and is available in a DIP8. You absolutely want to make sure there is local PSU bypass, per DS. It's a very good catch-all BJT opamp. OPA1602 as a safe, boring choice (read: works) as well.
As an all-purpose JFET-input opamp, OPA1642 is nice. SOIC8, though, so you'd need a adapter board. OPA2134 is another option, and available in DIP8.
I stand corrected, Scott. I meant to refer to the LT1358 of course, BUT the real parts that we used were in the LT1361-LT164 series that are DAMN FAST, and have a high open loop bandwidth. I recommend that some here try them. For some reason the LT1358 is NOT the same as the LT1362, but the topologies look about the same, so I thought them of the same series.
For the record, for those who don't know, high open loop bandwidth is important in reducing FM distortion, all else being essentially equal.
This of course is wrong, and it's even mathematically provable. Anyone here that wants to can check Ron Quan's second paper, the AD797 (just for instance) had unmeasurable PIM. John your own sources contradict what you say.
That's interesting he simply made a number of measurements and published the results what's there to disagree about? IIRC a lot of respected audiophile stuff measured poorly as did the uA741.
This is your thread why don't you elaborate quoting from his results.
- Status
- Not open for further replies.