That's what my brother keeps saying, LOL!Quote:
Originally Posted by AC439
What kind of amps do you build?
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That's what my brother keeps saying, LOL!Quote:
Originally Posted by AC439
What kind of amps do you build?
Caps will dry up overtime and this is a very common problem especially with car audio gears constantly being baked inside hot car. Bose car audio suffers from this problem all the time. I re-capped many Bose amps to bring them back to life.Quote:
Originally Posted by Dr_Snooz
Anyway, I build many different amps. Most of the time I build audio amps (tubes and transistors). For transistors amps, I built class A, AB etc. I also played with many Class D amps and mod them. They are really good sounding but my favorite is still Class A amps driven by a tube preamp. I don't care much about IC (chip) amps although some sound not bad (like TDA7297 or LM3875) but still go back to tube amp / Class A for serious listening. The second order harmonics from tubes and the lack of crossover distortion of Class A amps are what making the magic.
Chip amps are good for car audio since they are compact, reliable and efficient. IMHO, it is not a critical environment to listen to music inside a car anyway. All the bumps and road noise will make it a less then ideal place for music.
Other amps I also built was RF amps for radio transmission (I'm a HAM also). I know its getting off topics but below are some pics of things I built. A tube preamp, a dual Class D amp and an AM radio.
Cool stuff. Where do you get those awesome metal cases and quality knobs? Also, what are the amp classes you refer too?
We have a local surplus store that sells all kinds of stuff, mostly electronics related. I can spend a day every time I go and there's where I scored the chassis. The knobs I got from Radioshack before it closed. A lot of my parts are from electronic salvage from all these years. Sometimes I will gut out a radio or amplifier and salvage parts from inside. I hand wounded the green coil on a section of PVC pipe for the tuning circuit and used plexi glass to make the radio enclosure just for the sake of showing off.Quote:
Originally Posted by Dr_Snooz
The tube preamp is class A. The dual amps are both class D (digital).
Amplifier classes are based on the design and mostly depending on the set bias point of the output semiconductor (class A, B & C). Class D is in a totally different school which uses input analogue signal to switch the power transistor (like pulse width modulation) for amplification, then uses a low pass filter at the output for DAC (digital to analogue conversion) to convert back to the analogue required for driving the speaker.
If you are really interested to dig more into these stuffs, diyaudio.com is the place to go.
