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Grab Bag Sorting How-To

GrabBags

How-to sort a 1 pound grab-bag of small electronic components. I sort through one of the $1 grab-bags I purchased at the Austin Summer fest 2007 HAM meet up. The reason these grab-bags are cheap is that you have to do a lot of work to make the collection of parts useful. I explain my method and give the tally for the parts.

Work Area
GrabBagReadyToSort

You will need a work space that is at least one foot deep and 3 feet wide. Lay down several sheets of printer paper to work on. The white background will help you find parts and you can write notes around the part piles as you go along.

You should have a desk light to give plenty of illumination. Ideally the light would have a built in magnifier glass, if not, you may need a hand magnifier. Some of the part numbers will be hard to read for us older folks. I also find that getting a close up view of the resistor color codes helps me on occasion as well. Once you have seen the “Brown” used on a few of the resistors you will get better at quickly identifying it in the future. The magnifier helps you acclimate.

Culling
You should discard any broken parts or parts with leads that are two short to use as you go through each of these steps. The culling process does not need to be done perfectly, you will see most of the parts several times so this step actually just occurs as you go.

Presort
GrapbagPresort

The first step is to separate the parts into categories. Spread some of the parts on you work surface and start separating them based on what you find. I find the best way is to pick one or two types to do at a time. For example, I sifted through the pile pulling all the resistors and capacitors. Everything else went into the next pile. The process is simple and can be done quickly. Slide the part with your finger tip, it’s either a resistor, capacitor, or something to look at later. When you done with this pass you have three piles.

Put the presorted items into bin boxes for now and go back to the left over pile to sort out another category or two, in my case I did Diodes and Transistors next. I cheated a bit and created a unknown pile as I went along. If I was not sure what it was, I put it in a separate pile. I also made a Miscellaneous pile. This captured all the things that I knew but that were too few to really need further sorting.

Here are the presort results.

Mystery Items: 12
Miscellaneous: Tip jack tip, 2 pin power header, and a cable clamp
Diodes: 71
LED: 1 (Yellow)
Inductors: 8
Transistors: 52
Capacitors: 279
Resistors: 566

After the presort was done, I picked a group to sort. For each group you again do a presort. Group items by size, color etc… This helps you greatly when you move to the final stages as the parts in each of these piles will likely have one or two unique values. The final sort will be much easier this way.

Diodes
Diodes

I separated this pile into two major groups, big and small. Then did the big diodes, almost all of them I put into a bin box marked “Power Diodes” The smaller diodes were separated by color into a few groups, typical signal diodes, green diodes and there was a blue one that stood out. I looked at the numbers on a few of the normal red signal diodes, most were 1N4148s. I put this pile into the small signal diode bin box and looked at the green and blue diodes. I could not read or find the codes online so I am not sure what these parts are. Ultimately I made a bin called Unsorted Diodes for these and other similar parts labeled “Unknown” then moved on.

The Diode tally: 71

Small Signal 25 (1N4148)
Small Power 22
Medium Power 3
Mystery 1 TO92 , 1 green (ITT 05A 05), 19 blue (84S 09 04g)

Transistors
Transistors

Again sort first by size or any other distinguishable feature. Almost all the transistors were your basic TO-92 package. All but one of these parts had marks (EBC) for the emitter base and collector pins. This makes them easy to use in breadboards. Some had painted tops so those were separated out.

Eventually you get to reading the numbers and grouping them by part number. I wrote the number on the paper work surface and drew a large circle to identify the place to put them as I went though the pile. Rather then look them up online I used a DVM transistor tester to determine the type, NPN or PNP. This is all I needed to know as I keep signal transistors in one of two bins anyway.

I noticed that some transistor have low betas (for more about this term read the recent article about transistors here ) In fact one set of a specific part number had a typical beta of about 40. These are not very good transistors. Most of the others had normal betas in the 200 range and one group had betas in the 400 range. There was a single TO-92 part which over ranged my meter. This part could be something other then a BJT transistor or maybe a Darlington. I tried to look the part up online but could not find it.

I did not test each transistor. Once I knew what type a particular part number was I could move all the transistors of that type into the correct parts bin. But, I did test most and did find one that was bad. I assume it will be easy for me to spot any other bad transistors as I use them in breadboards.

The transistor tally: 53

NPN: 36, 3 MPN2222A, 4 04S01, 4 04S51, 13 04S48, 8 04S49, 4 others
PNP: 16, 8 A9H-1, 5 04S30, 3 others

1 mystery transistor that over ranges the beta measurement as a an NPN. Number on the part are 8824 G027.

Resistors
Resistors

By far the largest quantity of parts is 1/4 watt resistors. I decided to sort these by decade rather then try to identify each value. I started by laying out a part bin for each decade and wrote the color next to the bin on the work surface. Then one at a time, I picked a resistor and read it’s multiplier band. Read more about resistor value codes here, Reading Resistor Codes. I also found a good page with general informaiton about resistors here.

After doing a bunch this way I realized that it was taking a long time and I was occasionally dropping a resistor into the wrong bin. I would realize this and have to hunt down the resistor to get it into the correct bin. The solution was to work through the pile pulling only one decade at a time. When I did the 100K decade for example, I would slide each resistor from the main pile, if it had any yellow I would pause to see if the multiplier band was yellow, if it was move it to the output pile, if not, move it to the processed pile. When the pile was sorted this way, I would collect up all the found resistors and drop them into the correct bin.

I also found a bunch of 1% resistors and a few that I was not sure about. The 1% resistors have extra color bands. I did not bother to sort these. I made a bin for unsorted resistors and put all the special resistors there.

The Resistor Tally: 566

Group Multiplier GB Count
0-9.9 0 (in Misc)
10-99 Black 41
100-999 Brown 123
1K-9.9K Red 140
10K-99K Orange 79
100K-999K Yellow 71
1M-9.9M Green 32
10-99M Blue 1
Misc 79

Capacitors
Capacitors

The last category to sort is capacitors. This bag had three basic types of capacitors as seen in the picture. I first grouped the types into three piles then separated each pile by size. I have parts bins for capacitors sorted by decades and presorting them by size tends group them by decade so it’s the fast way to get done. Once you have several piles like the picture above you can check the value codes to find the correct decade value. Read more about capacitor value codes here, Reading Capacitor Codes.

The Capacitor Tally: 279

Group Multiplier GB Count
0-999pF 0 & 1 143 & 45
.001-.009uF/1000-9999pF 2 50
.01-09uF 3 40
.1-.9uF 4 1
Unknown 2

Results:
I had fun sorting all these parts but was it worth the time? Probably not. You can purchase parts kits for components like resistors fairly cheap. The parts come already sorted, ready to drop in your parts bins. Going through grab-bags is fun though. If your willing to spend the time to save a few bucks you can have a great time with grab-bags.

Comments Please
I found several mystery parts to identify. How about a contest where we give some details for a mystery component and award a prize to the first person that can identify and supply a datasheet link?

I would like to know of good sources for grab bags and parts kits. If you have a source, good or bad, please post it in the comments.

LabelSample

For my parts bins I used a Brother label maker to make simple text lables. I got to thinking that it would be nice to print up some color labels with the resistor color codes on them and even schematic symbols for some of the bins. Does anyone know of a source for a pre-made label sheet or a graphics file that can be printed on your own printer? I am working on one of these now and would hate to reinvent the wheel. Would a label sheet like this be valuable enough to work as a uC Hobby giveaway?

Posted in Discovering, Parts, Scrounging.


16 Responses

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  1. dfowler says

    Ricky,

    I did a quick search and did not find any information on this transistor. I hope someone else can help. Maybe I should run a contest or something. The first one that finds a datasheet wins something… It’s an idea to ponder.

    David

  2. Ricky D says

    Do you have any details or knowledge on the NPN 04S49 Transistors? I cannot find them listed or referenced anywhere but this site. I was building a fuzz box and the AC127 and BC108 transistors supplied sounded very poor. I replaced the Q1 with a 04S49 I found in an old electronics stash box my dad had from the 60s-70s. The 04S49 (Motorola logo) tranny really sweetened up the sound of this pedal. I is amazing. Just curious… Thanks -Rick

  3. ajr says

    it’s wonderful to find good information on completing simple tasks efficiently

  4. j m says

    great!

  5. dfowler says

    Sam,

    I have made a nice sheet of labels. I plan to do an quick article about them very soon. I will send you what I have in an email. Let us know what you think.

  6. Sam says

    Just building up my parts kit, and realized that labels for each bin with resistor color code + value would be usefull. Can’t believe there’s not one already on the net. If I make one (using the avery template), I’ll definitely publish it.

    dfowler, is your label sheet available?

  7. dfowler says

    NT7S, I just ordered the Analyzer kit. I suspect it will be the best $70 I have spent recently. I had a simular automatic transistor tester project planned so you spoiled my fun on that…

    sysadmn, I made a full sheet of color labels for parts bins which I figured might be a good thing to publish. I was wondering if anyone else had done something simular. I do have some small mailing labels wich I can try.

  8. sysadmn says

    What kind of pre-made label sheet or a graphics file are you looking for?

    I use Avery labels – they’re a little expensive, but they come in many sizes (check out address and file folder labels). If you use MS Word, there are downloadable templates; if you use OpenOffice, create a table with cells the size of the labels, and leave generous margins on all sides.
    If you use a graphics program to create your labels, generate a layer that outlines each cell, create each cell, then zap the outlines.

    All of these work better if you print a sheet at a time. I use a laser printer capable sheet (http://www.avery.com/us/Main?action=product.Details&catalogcode=WEB01&productcode=5260) and my printers “straight-through” path.

  9. nobody says

    I want some grab bags too:D can you show us some bigger pictures of the mystery items?

  10. NT7S says

    If you get seriously into appropriating semiconductors from grab bags and what-not, you might want to look into the M3 Semiconductor Analyzer:

    http://www.m3electronix.com/sa.html

    Just hook up the clip leads to the pins of the unknown device, and it will tell you what type of device it is and many useful parameters. The usual disclaimer applies, I’m not affiliated with the company, just an interested ham radio op.

  11. BrandonU says

    I’ll echo Electronics Goldmine. Nothing but good service and products whenever I order from them. I’ll typically throw a surprise box or an assortment bag on every order.

    http://www.goldmine-elec-products.com/prodinfo.asp?number=G9321

  12. dfowler says

    JP,

    Dan’s Small Parts and Kits looks like a great source for parts. Too bad he does not take online orders. You have to snail mail your order. But if your willing to go though that hassel he does have some great deals. I made a link below so it would be easier to visit.
    http://www.danssmallpartsandkits.net/

  13. Digger says

    Electronic Goldmine has some pretty good grab bag and assortment packs.

    http://www.goldmine-elec-products.com/products.asp?dept=1053

  14. JP says

    gotten some great grab bags from danssmallpartsnadkits.net The 500 plus piece grab bags usually have good stuff in them and occasionally they will go on sale for 5 for $10.00. I’ve gotten a lot of these over the past couple years, and they’ve stocked my resistors and capacitors inventory very nicely.

  15. Timm Tayshun says

    Awesome tutorial, now we can all have a wide selection of parts for cheap. Well done.

  16. pK says

    uhhh… hard work for sorting this but realy cheap! 🙂