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Calpe
Calpe il y a 5 heures
Quenton, after many years of servicing electronic equipment, electroyltics are always the first culprit that are checked first. It's good that there are so many variations in this project and again the posting in DiyAudio web site is great: - http://www.diyaudio.com/forums/chip-amps/301100-my-q-watt-project.html
Q-Watt - Simple Audio Power Amplifier (110656)
Quenton
Quenton il y a 5 heures
Yeah I know you're right. It would be no fun if everyone did it the same way. The spec is 400,000 hours at 40 deg on the Vishay 101s. Almost as good as EPCOS. But reality is another thing... You are right though - electrolytics dry out relatively quickly if unused. Can be 'reformed' with care. Q.
Q-Watt - Simple Audio Power Amplifier (110656)
Calpe
Calpe il y a 5 heures
I fully agree with Pascal, always take on board an electrolytics life span and the fact that they dry up. e.g.http://uk.rs-online.com/web/p/aluminium-capacitors/8712748/?searchTerm=871-2748&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E283F69292852537C5253207C52532D293F5C647B337D285C73293F5B5C732D2F255C2E2C5D285C73293F5C647B332C347D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D3837312D32373438267374613D3837313237343826 This example shows us: -Lifetime1000 (Shelf) h, 3000 (Endurance) h
Q-Watt - Simple Audio Power Amplifier (110656)
Pascal Hibon
Pascal Hibon il y a 8 heures
Be very careful with that statement Quenton. In way less than 30 years your buffer caps will be dead too... And whether or not the SMPS will fail "quickly" still remains to be seen. Don't compare audio grade SMPS's with those cheap ones used in PC's ! Technology has moved on... SMPS's are the standard in the professional world since many many years now. And these amplifiers get beaten quit heavily. They don't have massive power supply failures either.    
Q-Watt - Simple Audio Power Amplifier (110656)
Quenton
Quenton il y a 8 heures
Heh heh... lap it up fellas. My linear PS will still be good as new in 30 years when those new-fangled SMPSs are in landfill :-D I attached two 28R rheostat loads, one across each rail, and did a hot soak at 152 Watts (2x 1.65A). After 60 minutes the bridges were at 33 deg, caps ambient +1 deg. The 35 year old ILP toroid (625VA) peaked at 31deg surface temp. Soon to be replaced by a younger leaner model.
Q-Watt - Simple Audio Power Amplifier (110656)