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Discussion Groups | Piclist | YES! I finally got LEDs to flash!
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
YES! I finally got LEDs to flash! - Jason Hsu - Jun 17 20:34:00 2004
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Thanks so much for your support. And thanks so much to Microchip for sending me a free replacement PICSTART Plus. Now I understand why Microchip is so highly regarded and what people mean when they praise its support. It turned out that my original PICSTART Plus was at fault, not my computer or MPLAB as I first assumed. This was the reason I couldn't upgrade the PICSTART OS. No wonder so many people speak highly of PIC microcontrollers. Both the manufacturer and the user community offer excellent support, support that was especially critical for me since this is my first microcontroller. Jason Hsu, AG4DG http://www.jasonhsu.com/ee.html http://groups.yahoo.com/group/eeham/ http://groups.yahoo.com/group/resume_hyperinflation_fighters/ http://groups.yahoo.com/group/gmu-ece-control |
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What makes a powerful amplifier... powerful? - Thomas - Jun 17 23:46:00 2004
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Hi Everyone, I have been using many different kinds of low powered Audio Amplifiers (below 2W) before. Some can deliver 200mW. Some can deliver 2W. What makes a powerful amplifier... powerful? Is it because its output impedance is low? If you try to force it to deliver more that what it is designed to do, the output signal clips or distorts. Why is that? (Please try not to give me answer like "because you force it to deliver more that what it is designed to do..." Please help! __________________________________ |
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Re: What makes a powerful amplifier... powerful? - Allan Lane - Jun 18 8:26:00 2004
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There are two kinds of amplification -- current and voltage. If your output device is a speaker, then you are talking about current amplification, since a speaker is a magnetic coil driving a diaphragm. 'Clipping' here is reaching the max amount of current the output stage can put out. "Powerful" here means it can deliver a LOT of controlled current, which gets disappated in the load, which is listed as Watts. Watts get converted into sound pressure by the speaker -- so it also depends on speaker efficiency. A Bass-reflex type speaker should be able to convert 1 watt of output power into a 'loud' sound -- say 50 db or so. Note 110 db is a jet engine. 10 db is a whisper. A mid-range home stereo amplifier should be able to output 40 watts. 80 watts, and even 120 watts, are available in more high-end equipment. Voltage amplification clearly has a max voltage that can be put out. If your amplifier amplifies voltage by a factor of 100, and your input signal is .5 volts, then the output should be 50 volts. If you only have +- 5 volts driving the amplifier, then the amplifier 'clips' that signal to a +- 5 volt 'square-wave'. --- In , Thomas <thomasn102@y...> wrote: > Hi Everyone, > > I have been using many different kinds of low powered > Audio Amplifiers (below 2W) before. Some can deliver > 200mW. Some can deliver 2W. > > What makes a powerful amplifier... powerful? Is it > because its output impedance is low? > > If you try to force it to deliver more that what it is > designed to do, the output signal clips or distorts. > Why is that? (Please try not to give me answer like > "because you force it to deliver more that what it is > designed to do..." > Please help! > > __________________________________ |
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