What's your thought about used components?

acdc100 · 30th September 2011, 02:22 AM

Hello all

I'm building my audio power amplifier. Probably use TDA7294 or LM3886. Audio capacitors must be used to improve the sound quality. I searched web and found there're many used components (audio transistor pairs, audio capacitors and ICs) which are disassembly from old boards. The prices are much much cheaper than brand new stuffs. I'm thinking of buy these parts for my project since my budget is very limited. Does any one has experiences in using disassembly parts? are they reliable?

acdc

thaumaturge · 30th September 2011, 02:35 AM

Depends upon the part, why they were dissasembled and how old they are. Transformers I have no problems with. Transistors should be okay if certified not to be DOA. Caps you should get the date codes from before buying. Electrolytics dry out with age. I'd stick with caps no older than 5 years.
Doc

4pyros · 30th September 2011, 02:40 AM

Its like buying a used car you could always have problums down the road but thats about the same as a new car but you get a warranty with it.
Andy

acdc100 · 30th September 2011, 02:41 AM

How about WIMA MPK capacitors? Most are more than 5 years

thaumaturge · 30th September 2011, 03:00 AM

Couldn't say as I'm totally unfamiliar with them. But the rule holds for electrolytics in general.
Doc

TheLaw117 · 30th September 2011, 03:53 AM

Wima films aren't electrolytics. I recon they would be fine. Honestly, unless your layout is perfect, I think you'll have a hard time distinguishing a good quality Panasonic film from a pricey Wima. I use almost exclusively Wima (lol), but I don't think it really matters.

acdc100 · 30th September 2011, 03:56 AM

I won't buy old electrolytics because it may dry out. Price is not so expensive. I just interest in MKP. I can't find any reason for the performance decrease with age for this type.

acdc100 · 30th September 2011, 03:57 AM

TheLaw117, I agree..but WIMA looks cool, don't you think so? (-_*)

thaumaturge · 30th September 2011, 04:23 AM

Wow, a new market! Designer components!
Doc

4pyros · 30th September 2011, 11:09 AM

Quote:

Wow, a new market! Designer components!

Don't laugh it's out there.

30th September 2011, 02:22 AM	#1
acdc100 diyAudio Member Join Date: Sep 2011	What's your thought about used components? Hello all I'm building my audio power amplifier. Probably use TDA7294 or LM3886. Audio capacitors must be used to improve the sound quality. I searched web and found there're many used components (audio transistor pairs, audio capacitors and ICs) which are disassembly from old boards. The prices are much much cheaper than brand new stuffs. I'm thinking of buy these parts for my project since my budget is very limited. Does any one has experiences in using disassembly parts? are they reliable? acdc

30th September 2011, 02:35 AM	#2
thaumaturge diyAudio Member Join Date: Aug 2011 Location: Utah	Depends upon the part, why they were dissasembled and how old they are. Transformers I have no problems with. Transistors should be okay if certified not to be DOA. Caps you should get the date codes from before buying. Electrolytics dry out with age. I'd stick with caps no older than 5 years. Doc __________________ Ne timeas a facie mulierum ea ignorare

30th September 2011, 03:00 AM	#5
thaumaturge diyAudio Member Join Date: Aug 2011 Location: Utah	Couldn't say as I'm totally unfamiliar with them. But the rule holds for electrolytics in general. Doc __________________ Ne timeas a facie mulierum ea ignorare

30th September 2011, 04:23 AM	#9
thaumaturge diyAudio Member Join Date: Aug 2011 Location: Utah	Wow, a new market! Designer components! Doc __________________ Ne timeas a facie mulierum ea ignorare

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30th September 2011, 02:40 AM	#3
4pyros diyAudio Member Join Date: Nov 2010	Its like buying a used car you could always have problums down the road but thats about the same as a new car but you get a warranty with it. Andy

30th September 2011, 02:41 AM	#4
acdc100 diyAudio Member Join Date: Sep 2011	How about WIMA MPK capacitors? Most are more than 5 years

30th September 2011, 03:53 AM	#6
TheLaw117 diyAudio Member Join Date: Sep 2010	Wima films aren't electrolytics. I recon they would be fine. Honestly, unless your layout is perfect, I think you'll have a hard time distinguishing a good quality Panasonic film from a pricey Wima. I use almost exclusively Wima (lol), but I don't think it really matters.

30th September 2011, 03:56 AM	#7
acdc100 diyAudio Member Join Date: Sep 2011	I won't buy old electrolytics because it may dry out. Price is not so expensive. I just interest in MKP. I can't find any reason for the performance decrease with age for this type.

30th September 2011, 03:57 AM	#8
acdc100 diyAudio Member Join Date: Sep 2011	TheLaw117, I agree..but WIMA looks cool, don't you think so? (-_*)

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