Author Topic: Purchasing parts and basic components for a new lab  (Read 10960 times)

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Offline bson

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Re: Purchasing parts and basic components for a new lab
« Reply #25 on: July 26, 2018, 02:48:59 am »
Add some solid hookup wire, a wire stripper.

Some small cheap pots - 2k, 20k, 200k linear.  Solder hookup wire to them and connect the wiper to either end; use in lieu of an axial resistor.
 

Offline Jwillis

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Re: Purchasing parts and basic components for a new lab
« Reply #26 on: July 26, 2018, 05:00:16 am »
Most of what you've posted is fine .There are other assorted kits available including regulators ,Tantalum cap,monolithic caps and CD4000 series chips .I've not had any bad experiences with any micro chips on Ebay. Picked up a pack of 12 NE555 and they all work fine .Recently I've shifted to the TLC555 because they can go up to 2Mhz and are much more stable at the higher frequencies I've been working with.
The ceramics are Ok but are really out of spec.At least my are.Some as high as 50% out. Electrolytic s I get as I need them because i find most of the kits never get used.The kits are alright but the voltages are to low for my needs.But you might do OK with them.The Thetas are are usually around -89 to - 95 which is quite good.   

But if your still interested some really good capacitor kits can be found here https://www.justradios.com/ they're more expensive but are really good quality.They're not used but brand new parts with a very wide range of values .An example in price is say 200 Orange Dip Film Capacitors at 630 Volts (5 each of all 40 sizes) $69.99. You may not need such high voltages but it's an option .Or you can get which ever individual  ones you need . They have resistor kits but you probably be better off with the Chinese ones .It's likely you don't want or need to many carbon composite resistors. The only problem I have with the Chinese resistor kits  is I find myself having to fill the gaps in values and to many values I probably will never use.

Go with the 1 watt zeners for sure as T3sl4co1l suggested.

If you what to experiment with Mosfets the irf3205 is a decent one at 55V 110A and  a low RDS (8mOhms). They're popular and fairly inexpensive .

If I need a newer chip then I use Digikey , but most of the usual chips off Ebay are just as good. I tend to get a little abusive with chips some times and they stand up pretty well.

If you need transformers http://www.antekinc.com/ has really good stuff in the toroid.Very well built products.

Theirs lots of online electronic stores though out North America that are really good.And are really helpful when you have problem deciding on a component for a specific application.

Anyway good luck
 
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Offline tooki

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Re: Purchasing parts and basic components for a new lab
« Reply #27 on: July 26, 2018, 05:02:14 am »
Add some solid hookup wire, a wire stripper.

Some small cheap pots - 2k, 20k, 200k linear.  Solder hookup wire to them and connect the wiper to either end; use in lieu of an axial resistor.
Wire and strippers already discussed in this dude's first, giant thread. He idiotically decided to start a bunch new threads to discuss specifics…  |O |O |O :palm:
 

Offline Dubbie

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Re: Purchasing parts and basic components for a new lab
« Reply #28 on: July 26, 2018, 05:15:59 am »
One part that I find super handy to keep in stock is a bunch of N channel mosfets that are happy being driven from logic levels. I use BSS138, but you can find something that suits you.

 
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Offline AnyNameWillDoTopic starter

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Re: Purchasing parts and basic components for a new lab
« Reply #29 on: July 26, 2018, 05:42:27 am »
Wire and strippers already discussed in this dude's first, giant thread. He idiotically decided to start a bunch new threads to discuss specifics…  |O |O |O :palm:

Come on, man, you don't have to resort to insults.

I made *one* thread about general lab equipment (the big thread) and one about component parts (this thread). I hardly think it's idiotic to discuss specifics or try to segment/focus discussion in a field that is so vast and chock-full of material, especially when threads start to become top-heavy.

I made another thread about flux application/cleaning but again that's again a more focused topic.
« Last Edit: July 26, 2018, 05:56:20 am by AnyNameWillDo »
 
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Offline AnyNameWillDoTopic starter

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Re: Purchasing parts and basic components for a new lab
« Reply #30 on: July 26, 2018, 02:14:44 pm »
How often do you encounter situations where 74HC logic chips are useful? Any particular ones you use a lot?
 

Offline sokoloff

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Re: Purchasing parts and basic components for a new lab
« Reply #31 on: July 26, 2018, 02:25:12 pm »
Most everything is moving/has moved to microcontrollers now, so the discrete logic chips are there mostly as microcontroller extenders in my use case.

595 (shift registers) are the only ones I've used a fair amount. Other than that, a smattering of inverters and line drivers/segment decoders.

I'd stock some shift registers, maybe a few basic NAND, NOR, inverters, and plan to buy per-project on-demand anything else. The basic chips are mostly so you can teach yourself how TTL logic works. It's simple and generally robust, but there's no substitute for plugging things together and playing with it physically.
 
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Offline tooki

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Re: Purchasing parts and basic components for a new lab
« Reply #32 on: July 26, 2018, 04:28:24 pm »
Wire and strippers already discussed in this dude's first, giant thread. He idiotically decided to start a bunch new threads to discuss specifics…  |O |O |O :palm:

Come on, man, you don't have to resort to insults.

I made *one* thread about general lab equipment (the big thread) and one about component parts (this thread). I hardly think it's idiotic to discuss specifics or try to segment/focus discussion in a field that is so vast and chock-full of material, especially when threads start to become top-heavy.

I made another thread about flux application/cleaning but again that's again a more focused topic.
I'm getting annoyed because you've lost track of what info has been given to you and so re-ask in other threads, so the info is not only redundant but also fragmented.
 

Offline AnyNameWillDoTopic starter

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Re: Purchasing parts and basic components for a new lab
« Reply #33 on: July 26, 2018, 05:17:05 pm »
I'm getting annoyed because you've lost track of what info has been given to you and so re-ask in other threads, so the info is not only redundant but also fragmented.

Doesn't matter -- that's no excuse to resort to insults.  I haven't "lost track" of info -- I forgot maybe one or two things buried within random posts between all these pages, videos, websites, etc that I've been poring over.

And again on this site we're talking a grand total of two threads here, so it's not "other threads." It's other thread. And each one has a very different focus.

If such a small thing is enough to "annoy" you then don't read or respond to the thread -- no one is forcing you to.
« Last Edit: July 26, 2018, 05:36:40 pm by AnyNameWillDo »
 

Offline ez24

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Re: Purchasing parts and basic components for a new lab
« Reply #34 on: July 26, 2018, 09:51:20 pm »
I'm getting annoyed because you've lost track of what info has been given to you and so re-ask in other threads, so the info is not only redundant but also fragmented.

Doesn't matter -- that's no excuse to resort to insults.  I haven't "lost track" of info -- I forgot maybe one or two things buried within random posts between all these pages, videos, websites, etc that I've been poring over.

And again on this site we're talking a grand total of two threads here, so it's not "other threads." It's other thread. And each one has a very different focus.

If such a small thing is enough to "annoy" you then don't read or respond to the thread -- no one is forcing you to.

You have to have a thick skin to be here because some members get upset easy.  Tooki has vented his anger at me also, so you are not alone.  Don't let him get under your skin.   Don't start a war or this will get shut down.

I will add your $1000 lab thread to my List C  (see below).  Is there a link in that thread to this one?  How about make sure that all your threads are linked together so it will be easy to move around them.  I think it would be best to add them to the first posts as an edit.

If you have the energy, how about putting together a spreadsheet on what you end up with.

Keep up the good work.
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Offline AnyNameWillDoTopic starter

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Re: Purchasing parts and basic components for a new lab
« Reply #35 on: July 26, 2018, 10:17:25 pm »
I will add your $1000 lab thread to my List C  (see below).  Is there a link in that thread to this one?  How about make sure that all your threads are linked together so it will be easy to move around them.  I think it would be best to add them to the first posts as an edit.

If you have the energy, how about putting together a spreadsheet on what you end up with.

Good idea -- added links.
 

Offline rhb

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Re: Purchasing parts and basic components for a new lab
« Reply #36 on: July 26, 2018, 11:00:40 pm »
I spent several *days* ordering infill for my passives.  And a week binning them.  In total I spent several hundred dollars.  I've still got a large box of caps and semis to bin.  Newark has really good prices if you hunt around, but it's so much work I haven't been able to muster the energy to do it again.  The pricing makes no sense at all.  Less than a penny to over a nickel for 5% 1/4 watt resistors in quantity 100.

And all I've done so far is thru hole.  I dread doing SMDs.  But at least they are cheaper.  Caps will really make you crazy because there are so many varieties and voltage ratings.
 

Offline Dubbie

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Re: Purchasing parts and basic components for a new lab
« Reply #37 on: July 26, 2018, 11:12:10 pm »
I spent several *days* ordering infill for my passives.  And a week binning them. 

What do you mean by binning them?

Surely you don't mean measuring them all?
 

Offline Jwillis

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Re: Purchasing parts and basic components for a new lab
« Reply #38 on: July 27, 2018, 03:49:16 am »
I wouldn't get to carried away stocking up on components.There are millions of micro chips  that serve specific purposes and millions of passive components ,as you probably well know.Start with the basics.Go for well documented chips with lots of circuits to try. The LM741 op amp  ,NE555 timer ,μA723  regulator.Get say 5 or 6 of each in case you burn one or two up experimenting.These will keep you plenty busy for a while,Then pick up others as you need them.Trust me ,you'll soon have a fairly extensive stock in no time.And theirs nothing wrong with salvaging parts either.It's all good.Sometimes I like to spend an evening watching TV ,pulling parts and searching data sheets to learn what they all do.It's relaxing after a rough day at work.
I know it's not my place to tell you what you should do with your money.But why blow a stack of money on components you might use when you can get cool toys that you will use and need.
You'll be surprised how quickly you collection will grow in a very short time.
 
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Offline AnyNameWillDoTopic starter

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Re: Purchasing parts and basic components for a new lab
« Reply #39 on: July 27, 2018, 04:12:20 am »
Yeah I hear you -- I'm just trying to (perhaps pre-emptively) stock up on some common parts so that I won't have to wait weeks by the time I encounter a project where I need to have a few things at hand. The components are cheap enough IMO.

Any thoughts on SMD protoboards to practice SMD soldering?
 

Offline Dubbie

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Re: Purchasing parts and basic components for a new lab
« Reply #40 on: July 27, 2018, 04:59:12 am »
I use a ton of SMD protoboards. Just cheap ones off ebay. They are great for testing out chips before you order your boards.
Only problem is, is there is a huge variety. The ones I tend to use most are QFNs and SOIC . I also tend to use a bunch of 0.5mm pitch generic ones.

You can just order a grab-bag of a dozen different types.

I haven't used through-hole in a project for a few years now and don't miss it a bit!
 
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Offline ez24

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Re: Purchasing parts and basic components for a new lab
« Reply #41 on: July 27, 2018, 05:23:13 am »
Yeah I hear you -- I'm just trying to (perhaps pre-emptively) stock up on some common parts so that I won't have to wait weeks by the time I encounter a project where I need to have a few things at hand. The components are cheap enough IMO.

Any thoughts on SMD protoboards to practice SMD soldering?


https://www.aliexpress.com/item/CD4017-Rotating-LED-SMD-NE555-Soldering-Practice-Board-DIY-Kit-Fanny-Skill-Training-Electronic-Suit/32812908140.html

The way I pick Ali stuff is sort on Orders and then pick a top seller
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Offline AnyNameWillDoTopic starter

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Re: Purchasing parts and basic components for a new lab
« Reply #42 on: July 27, 2018, 06:37:14 am »
I use a ton of SMD protoboards. Just cheap ones off ebay. They are great for testing out chips before you order your boards.
Only problem is, is there is a huge variety. The ones I tend to use most are QFNs and SOIC . I also tend to use a bunch of 0.5mm pitch generic ones.

You can just order a grab-bag of a dozen different types.

I haven't used through-hole in a project for a few years now and don't miss it a bit!

I don't see any on ebay unless you're technically referring to the adapters that translate SMD to DIP?
 

Offline Dubbie

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Re: Purchasing parts and basic components for a new lab
« Reply #43 on: July 27, 2018, 06:38:55 am »
Yeah just the adapters. I tend to cobble together a bunch of passives on the same board. Often they are double sided with a different footprint on the other side, so you can solder on some passives there if necessary.
 
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Offline sokoloff

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Re: Purchasing parts and basic components for a new lab
« Reply #44 on: July 27, 2018, 09:01:40 am »
Yeah I hear you -- I'm just trying to (perhaps pre-emptively) stock up on some common parts so that I won't have to wait weeks by the time I encounter a project where I need to have a few things at hand. The components are cheap enough IMO.
You’re in the US. You can have common parts on your doorstep the next day from any number of legit distributors. Yes, it will cost more than getting them from Shenzhen, but you don’t have to wait 1-4 weeks for them to arrive. If you can wait 3 days, shipping is quite cheap. For a typical “weekender” hobbyist, you can have parts every weekend if you remember to order them on Sunday/Monday.

It’s more important to get started than to start at maximum theoretical economic efficiency.
 
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Offline tooki

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Re: Purchasing parts and basic components for a new lab
« Reply #45 on: July 27, 2018, 09:07:10 am »
Also, a good happy medium for some components is Tayda Electronics from Thailand. They’re not as cheap as Chinese vendors, but they also arrive in a week or less, vs 1-4 weeks for China.

But I agree, as a US resident, you can get stuff fast anyway. One approach to consider might be to stagger, over the course of perhaps a year, your preemptive purchases from Digi-Key into a few orders that each exceed the 50 dollar minimum for free shipping. That way you can easily tack on the oddball components onto an order without having to artificially pad the order to the minimum. :)
 
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Re: Purchasing parts and basic components for a new lab
« Reply #46 on: July 27, 2018, 09:07:56 am »
It's great to see you so enthusiastic about starting out but try and resist the temptation to buy everything you see.  To give you an idea, I have been doing electronics / computing for over 30 years both as a hobby and professionally and still end up having to order parts for most projects.  Even if money & space aren't a problem you just end up losing track of stuff and find yourself buying them again  ;D  It would be great to see you build some stuff and maybe post your progress.  PS be wary of buying silicon from ebay, there are a lot of fake parts which won't help your learning.
 
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Offline Old Printer

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Re: Purchasing parts and basic components for a new lab
« Reply #47 on: July 27, 2018, 11:47:40 am »
I spent several *days* ordering infill for my passives.  And a week binning them. 

What do you mean by binning them?

Surely you don't mean measuring them all?

I believe binning is an UK term for sorting components and placing them in small compartments or drawers so it is easy to find them quickly when needed. I think most people that buy components in bulk measure/check them when used unless you buy in "grab bag" style.
 

Offline Jwillis

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Re: Purchasing parts and basic components for a new lab
« Reply #48 on: July 27, 2018, 12:58:26 pm »
Search "SMD Component Welding Practice Board" on Ebay .Theirs lots of them.I've never tried one myself and not sure what they do when finished. As for silicon from Ebay ya it's possible that some might be fake .But if you buy components from a vendor that also sells lingerie you probably want to steer clear of that one. :-DD .There are lots of electronic dedicated vendors available that have very good products.
 

Offline sokoloff

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Re: Purchasing parts and basic components for a new lab
« Reply #49 on: July 27, 2018, 01:06:01 pm »
I believe binning is an UK term for sorting components and placing them in small compartments or drawers so it is easy to find them quickly when needed.
I always thought "binning" was "discarding in trash" in the UK.

We use that word in our factories to mean "consolidate items together [in a plastic bin] so they can be shipped together".
It's always amusing to explain to our new EU colleagues (most of whom learned British English) "OK, this product is produced and passed quality checks perfectly; now we need to bin it..."
 


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