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Guenter Klomann
Guenter Klomann vor 3 Stunden
The coding principle is quite simple: You EXOR the data stream and the random data. This always is working independent of the other communcation layers, and is (mathematically proven) unbreakable, if the random data is really random. I remember, that there are some hardware random generators, which are quite good, but I do not remember the details (Something was described in ELEKTOR or ct a few month ago?) The second important thing is the exchange of the random data between source and destination (memory space is no problem in these days). What about a small device, which say "let us exchange our codes" (by NFC or similar) instead of handshake or kissing when you meet your friend? I think, this is a better project, than optimizing the communication of encrypted data.
One-time pad OTP Crypto System
Calpe
Calpe vor 19 Stunden
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 vor 19 Stunden
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 vor 19 Stunden
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 vor 22 Stunden
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)