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Topic: Test equipment (Read 3176 times) previous topic - next topic

larryd

How things go together.




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tinman13kup

Larry, What is the bubble licious? I tried a search and all I got was 1000 different result for marijuana. ??? Got a kick out of that

 Isn't the internet great!
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

Member Crossroads offers/offered this 8 digit LED 7segment display SPI board.
I use them to display messages sent from the Arduino.



http://www.crossroadsfencing.com/BobuinoRev17/


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larryd

No technical PMs.
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larryd

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raschemmel

#20
Oct 22, 2016, 10:05 am Last Edit: Oct 22, 2016, 10:15 am by raschemmel
@LarryD,

You ROCK !

I just got one of these...

tinman13kup

#21
Oct 22, 2016, 02:58 pm Last Edit: Oct 22, 2016, 03:07 pm by tinman13kup
Larry- I thought that was what it was. Just wanted to make sure. I don't have any led segment displays laying around yet. Do you use it a lot? While I was in electronics for awhile, I was away from it for 25yrs too. I was more into analog circuits and HF transmitters. This mcu stuff is new territory for me. I understand the concepts easy enough, but have to work through the complexities.

  As for the rework station, I have a Tenma hot air station that does alright. Even my Xytronic temp controlled solder station works good. Having a dro of the temp would be nice though. I recall trying to solder something and, since one hand was holding the wire and the other the iron, placed it by my lip to see if it was getting hot. Depth perception is under rated IMO. I had a burn across both upper and lower....lesson learned. That was probably 30yrs ago. Still traumatized by it....

  @Raschemmel- looks expensive, and besides- if I were to get one of those, where would I put my particle accelerator and fusion reactor that runs all this stuff??? 
  You might have a 1Ghz scope and an electron microscope, but I have more stuff on my desk. That might not be a good thing though....
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

outsider

Not meaning to butt in here, I have a couple of temp controlled irons but never knew what a good soldering temp is (250 C, 300?).
TIA

Watcher

Rigol DP832 Bench Power Supply,
Rigol MSO2102A Scope,
Aoyue 968 Rework station,
Siglent 810 function generator,
Andostar USB microscope,
Fluke 177 DMM
Fluke 289 DMM

tinman13kup

@outsider, never got into the metric thing, but I try to keep the heat to as little as possible to efficiently do the job. I think I'm around 575F in general.
  Most of the chips out there have specs for allowable heat and times in the datasheets to prevent damage. There is also different temp solders to make things more interesting.
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

#25
Oct 22, 2016, 06:28 pm Last Edit: Oct 22, 2016, 07:08 pm by LarryD
@raschemmel
Quote
I just got one of these...
Going to call you the "Wizard of ARD", short for Wizard of Arduino ;)
We bow down.


@tinman13kup
They are becoming less available.
Got a large handful from Crossroads, should last me for the next 15-20 years.
Mostly use them for small package size projects.
This version is small and BTW it glows in the dark ;)

LCD displays are more flexible but larger.

I am sure you will find this Arduino platform fun to use.

Quote
placed it by my lip to see if it was getting hot.  :smiley-confuse:
I have seen others do that over the years.
I just try to see if a small bit of solder melts on the tip ;)

Sounds like you will fit in here quite nicely.
raschemmel is the oldest one here, he's really really old.
He has quite a successful bottle business.


Quote
Not meaning to butt in here, I have a couple of temp controlled irons but never knew what a good soldering temp is (250 C, 300?).
TIA
For a soldering iron, I like mine on the hot side ~410C.
Get in, get out quickly.
For the 'Hot Air Wand' between 340 to 400C, depends on the size of the nozzle and on the air pressure.

Liquid flux should be on hand.
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tinman13kup

raschemmel is the oldest one here, he's really really old.

Are you saying Raschannel designed the first TTL computer?

 I will say he does have some nice toys at his disposal.

I've been gathering some items to make the vaccum tool you posted earlier. I found an old air pump that I could reverse the input on and found the syringe. A quick mockup and trial has it working just fine. Now I have to locate some softer air line and modify the needle a bit. I'm thinking about trying a soft coupling at the end to help with a seal. Perhaps the insulation off some Cat5 wire.

As for the development board, I've been pondering what I might find useful. You have a buck converter on yours and power it with 12V? I have a little buck PWM controller and many of the passives I pulled from an old laptop board and was thinking on doing similar to what you have, so I have 12V available for circuits as well as 5V for the MCU and other circuits as needed and only require a single supply. I also want to drop in a straight 5V input and bypass the buck for when I don't need 12V.  It should be simple enough and since  it's a tiny TDFN package I get to try out the vacuum tool too. It also means I need to immerse myself in the datasheets so I can get the passives figured out. It's a one shot deal, as I only have 1 chip and no way to breadboard it.

 
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

"Are you saying Raschannel designed the first TTL computer?"
I think he heats his house with old vacuum tubes.  ;)

Buck converter.
I have used this version a lot.
http://www.ebay.ca/itm/10-PCS-LM2596-DC-DC-buck-adjustable-step-down-Power-Supply-Converter-module-/221920170517?hash=item33ab791215:g:5zEAAOSw~bFWKKJO


I power it with a 9V 1amp wallwart.

Clear line that is use with aquariums works well.

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tinman13kup

I'm sure I have some air tube here, just need to go out in the garage and look.

Those buck converters are nice to have around but I also like the challenge of building the circuit myself. It allows a little more flexibility and makes me use my noggin more. I also find it helps to understand the circuits better. It's not that I'm out to reinvent the wheel, but I like to play with the spokes from time to time. I see that converter and see it as a chip, 3 caps, a diode, an inductor and a pot.

Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

#29
Oct 22, 2016, 10:13 pm Last Edit: Oct 22, 2016, 10:30 pm by LarryD
Switching converters are difficult to design.
This version has regulation and shut down circuitry built in.

For $2 :) I use these as a daughter card and put my efforts into other endeavours such as the application design, software and final construction.

This is my version of the pickup tool in the YouTube video.

https://www.youtube.com/watch?v=qJWUUK1s_G0&app=desktop

The yellow stuff in the syringe is 5 minute epoxy.
The suction cups are only needed for larger, heavier chips.

I cut the holes in the piston and syringe side with a hot 3/16" brass pipe.



$10 on Amazon.com
https://www.amazon.com/Tetra-77853-Whisper-Pump-40-Gallon/dp/B0009YF4FI/ref=sr_1_1?ie=UTF8&qid=1477167512&sr=8-1&keywords=Tetra+77853+Whisper+Air+Pump%2C+40-Gallon


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