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Old 27th December 2004, 04:22 AM   #1
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Default Where do you buy your components?

I am about to build my first power amp, but I am having trouble finding parts at local stores such as Radio Shack and Fry's. Do you guys have a particular website that you buy all your parts from? Any recommended sites?

I found several "replacement" parts from fry's made by NTE. Do any of you have experiance with NTE products and should the replacements work fine?

Also, my gain stage contains a Vbe multiplier that uses a 1k Potentiometer. I bought a 1k Ohm Audio Taper/Switch Potentiometer from fry's. Should that be fine?

Thanks for any help.
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Old 27th December 2004, 04:35 AM   #2
murat is offline murat  United States
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Check:

www.digikey.com

www.mouser.com

I am not sure about the pot but usually 10k or higher is recommended.

Cheers,

Murat
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Old 30th December 2004, 05:38 AM   #3
Enzo is offline Enzo  United States
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Depending on what you do, look into some of these. I highly recommend ordering the paper catalogs from each. It is so much easier to browse a paper catalog to get an idea of what they have. Online is good when you know what you want.

Mouser is good and so is Digikey. I also use Allied for some things like power semis, but they have a stiffer minimum.

www.alliedelec.com

www.jameco.com is a hobby friendly place if more limited in selection. They also make the Jimpak line you might see in some stores.

MCM Electronics carries Japanese number series semiconductors and other general stuff www.mcminone.com

www.partsexpress.com has lots of speakers and speaker related stuff.

LOts of other places too.

Personally I avoid NTE and other "replacement" part vendors. I usually can get the "real" part cheaper and it will be exactly the part I want. Not only that, but if I mix NTE transistors with say Moto transistors ina power stage, I have no confidence they will share current evenly.

When I can buy a general purpose signal transistor like a 2N4401, 2N3904, MPSA06 or whatever for maybe 4 cents or 6 cents each, why would I buy the NTE part they say is equivalent?
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Old 30th December 2004, 06:18 AM   #4
jwb is offline jwb  United States
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http://www.newark.com/ the same parent company as MCM, but with a different catalog. Good source of ASICs from Crystal Semiconductor and Analog Devices.

http://www.ampslab.com/ has some hard-to-find Japanese transistors

http://www.percyaudio.com/ carries audio specialty parts like binding posts, overpriced capacitors, and so forth.
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Old 30th December 2004, 12:57 PM   #5
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I'll add Arrow - http://www.arrow.com/ to the above list, although I primarily buy from Digikey and Mouser, sometimes Arrow has the parts I need when they don't.

As for your Vbe multiplier, you should be OK with the audio taper job, although adjustment may be touchy. A standard bournes trimpot at mouser runs about a buck, two bucks for a 10 turn type.
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