Assorted Essential components?
stevels
Posts: 19
Essential components!
Does anyone know a good place to get some assorted “essential” components to prototype and experiment with?
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I am looking for both a collection of chips, like some 555 timers, dual op amps, etc… as well as a decent assortment of resistors and capacitors.
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I am looking to have enough of the common flavors to produce some prototyping that uses multiple instances of the same value, and preferably, an assortment of less common ones too.
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Is there a electronics enthusiast store that pre packages something like this?
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Thanks!
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Steve
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Expert in many fields, dumb as a stump with STAMP
Does anyone know a good place to get some assorted “essential” components to prototype and experiment with?
·
I am looking for both a collection of chips, like some 555 timers, dual op amps, etc… as well as a decent assortment of resistors and capacitors.
·
I am looking to have enough of the common flavors to produce some prototyping that uses multiple instances of the same value, and preferably, an assortment of less common ones too.
·
Is there a electronics enthusiast store that pre packages something like this?
·
Thanks!
·
Steve
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Expert in many fields, dumb as a stump with STAMP
Comments
Good flat rate courier service, online ordering confirms whether stuff is in stock, and you can search fairly quickly by part name/number or by function.
I usually go with bags of 100 resistors in 100, 220, 470, 1K, 4.7K, 10K as the shop standards. Similarly with 0.01, .1,1, 5, 10, 50, 100 uF caps at 50volts.
Chips generally vary, but 555 timer, some op amps that run nicely on a unipolar power supply, '123 one-shots, and schmitt triggers are handy to have around. I like the higher voltage families that let me work at 5v or 12-15volt.
To be truthful, I keep several stamps plugged into EnT controller boards at all times so I can quickly program some special function into the stamp rather than crank one up out of discrete components.
Cheers
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Tom Sisk
http://www.siskconsult.com
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For breadboards and a wire assortment use www.allelectronics.com/ for a good price or if you're in a hurry then Radio Shack stocks these at a reasonable price.
So we go shopping without much knowledge of what will be useful and end up with things that just won't get used.
Resistors and capacitors are cheap and cheaper in quantity. So it doesn't hurt to buy a package of assorted values and to have some values sit around forever. Capacitors are a bit more tricky as they are rated by voltage as well as capacitance. Anything under 25 volts may be of limited use, anything with polarity is more limited than without.
Diodes really are not required in a range. What you need is small switching diodes [noparse][[/noparse]faster response], rectifier diodes [noparse][[/noparse]slow response, but handle a lot of amps], and occasionally a schottky diode for lower voltage drop.
Transistors best be left to 2n3904, 2n3906, 2n2222, and the 2n2222's compliment [noparse][[/noparse]I forget what it is]. Handling a lot of other sizes becomes quite problematic. And most digital has gone to MOSfet for power switching anyway.
Low dropout voltage regulators are better than the old 78L05s as they make for a longer useful battery life. LM2940-5 is an excellenct choice, but will require a 22.5uf cap or greater on the output side. For 3.3volts the LM2940-3.3v is also available.
Crystals are quite problematic. Resonators with built-in capacitance are more fogiving and can easily be used with Parallax's demo boards.
Logic ICs are almost obsolete by the programiblity of newer devices. The shift register is a significant exception as you can convert 8 parallel keys to one shifted input. Shifted output is similarlly useful. Basic inverters offer a protective buffer and can provide more power output.
The 555 comes in a huge variety of manufactures that have subtle differences. The low power CMOS are an attactive choice, but have some limitations that the older ones did not.
Heat sinks are often needed the most when not on hand.
Above all, don't buy spools of wire. But a 3 meter [noparse][[/noparse]ten foot] hunk of 25 strand cable and you have 25 colors for much less cost.
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"If you want more fiber, eat the package.· Not enough?· Eat the manual."········
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I wouldn't connect that if I were you...
Vive Le Tour!
July 1 - July 23
Actually the BEST compliment to the 2N2222 is:
"You're one of the finest general purpose transistors on the market" <oops>
Regards,
Bruce Bate
<ducking>
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That got me to thinking about the complement to the 2N3055 (a common power transistor in a TO-3 package) which is the 2N2955.
I keep a lot of 2N2222/2907's and even more 2N3904/3906's in stock because they are just so darn useful (and really cheap). I don't even think twice about adding an output transistor to a 555- or Stamp-based circuit to do the "heavy" lifting.
For higher-current applications I keep a few 2N3055's on hand as well as a handful of TIP31 and TIP32 medium power transistors. And since Kramer is dead-on with respect to heat-sinks...
...I keep a few TO-220 and TO-3 style heat-sinks on-hand. Basically, if you're using something like 2N3055/2N2955 or even the TIP31/32, you're probably doing so because you need to deal with some serious current so you've got to have a heat-sink or you're going to end-up cooking silicon.
Jameco Electronics (jameco.com) carries pre-packaged assortments of many types of components which you can purchase with or without plastic cabinets. For example, you can order a "kit" of 100 each of 24 different resistor values. Quick way to stock a parts bin! Maybe the original poster would be interested in these although I think he's more after a parts kits intended to be used with an experimentor's hand book, i.e. 100 experiments and the parts to do each one.
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I wouldn't connect that if I were you...
Vive Le Tour!
July 1 - July 23
Post Edited (aalegado) : 12/21/2006 1:06:23 AM GMT
I think I found a source that might be a tad more accessible than what I suggested before, jameco.com. Try hobbyengineering.com. They have a components page www.hobbyengineering.com/DeptEE.html that has links to various component types and I found resistor and cap assortments that might be a good starting point.
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I wouldn't connect that if I were you...
Vive Le Tour!
July 1 - July 23
http://www.jameco.com/Jameco/catalogs/c264/P219.pdf
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John R.
8 + 8 = 10