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Silver Member Username: AraknidPost Number: 135 Registered: Nov-04 | im not sure if thats how its spelled but theres a brand similiar to that spelling and i wanna know if there any good? |
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Silver Member Username: AraknidPost Number: 136 Registered: Nov-04 | I found out there MOSFET. |
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Bronze Member Username: ZeppPost Number: 27 Registered: Dec-04 | mosfets are the amps found in stereos and such (head units, shelf systems, etc) |
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New member Username: FatryanPost Number: 7 Registered: Jan-05 | ha ha ha. MOSFET is the "new" technology used in todays audio amplification (and by "new" i mean old but still advertised as new). its not the brand. but if you happen to find an amp that doesnt use MOSFET technology, stay far far away from it... |
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Silver Member Username: AraknidPost Number: 140 Registered: Nov-04 | no I know about the whole tech crap but I did find an amp brand named MOSFET, they had a 200 watt and a 400 watt model at the store. |
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New member Username: FatryanPost Number: 10 Registered: Jan-05 | then theyre junk. if you cant even find a brand name, they must be junk |
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Gold Member Username: Jonathan_fGA USA Post Number: 2942 Registered: May-04 | MOSFET=Metal Oxide Semiconducter Field Effect Transistor. "but if you happen to find an amp that doesnt use MOSFET technology, stay far far away from it..." MOSFETs aren't the best design out there as far as audio transistors, but it's does excel as a switching device for the power supply. An amplifer uses a transformer to raise voltage to a higher level for more power, and since transformers work on the principle of inductance, they require alternating current. The car uses 12V direct current, meaning you need to convert DC to AC before entering the transformer. This is the MOSFETs job, it pulsates current at a set frequency (much higher than audible range, usually around 50k), and then send that power to the transformer, and the output of the transformer is AC output and results in higher voltage on the lines. As far as the actual audio amplification signal, the MOSFET isn't the best choice, it's only benefit is that it is rugged. It is extremely non-linear, resulting in a poorer frequency response and higher distortion. Any high end transistor amplifier you see will use bipolar transistors for output devices, they perform much better overall. Of course, there are also tube amps, which are a horse of a different color, but still very good. |
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Gold Member Username: GlasswolfNorthWest, Michigan USA Post Number: 7230 Registered: Dec-03 | quoted from: http://www.wickedcases.com/caraudio/amplifiers.html Bipolar or MOSFET?: We have seen both MOSFET (Metal Oxide Silicon Field Effect Transistor) and Bipolar transistors used in audio amplifiers. Claims have been made that each is superior. I have seen claims that MOSFETs have a tube ("Valve" for the Brits) sound. This is more folklore. The musicians and their instruments are supposed to have "the sound", not audio equipment! MOSFETs are tougher than Bipolars, and can pull closer to the supply rail. It takes more Bipolar transistors to achieve the same power as a MOSFET, therefore Bipolar amps tend to be more expensive. But, MOSFETs are very non-linear, compared to Bipolars and require much more feedback to achieve reasonable distortion numbers. They are a great choice for bass amps, as low frequency audio is not difficult for a MOSFET. The most expensive car and home amplifiers almost always use Bipolar transistors. MOSFET isn't always "better." Be sure ya know what you're saying when it comes to amplifier design. Anyway I'm sure some company has taken the name MOSFET as a product line or brand name now.. It sounds vaguely familiar.. a lot like legacy and the like. |
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Bronze Member Username: FatryanPost Number: 17 Registered: Jan-05 | actually come to think of it, i think GlassWolf is right. now im remembering some company that actually uses MOSFET as a name...eh. either way, its probably junk |
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Silver Member Username: Addicted2bassMiami, FLORIDA USA Post Number: 157 Registered: Nov-04 | yeh and there amps look alot like a sony amp. i could've swore when i saw it,it was a sony amp |
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Bronze Member Username: FatryanPost Number: 21 Registered: Jan-05 | oh god! please stay far away from that crap. the only thing worse than sony car audio is knock-off sony car audio |