phantom240
5,000+ posts
ALL YOUR INTERNETZ
wtf mate.
- Thread Starter
- #3
here is a pic im talking about the blue boxes what are they called and whats there function, but if anyone knows can they give a descriptions of other coponents and what the function is to the amp thanks,
the amp is an ab400.1 borrowed from roe
just tryin to learn some things about amp guts //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
the amp is an ab400.1 borrowed from roe
just tryin to learn some things about amp guts //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
DjiNN
10+ year member
Posts but still a NooB
talking about the fuses?
probably metalized film caps in the box style cases.
they are not polarized, and the poly-film construction results in low dielectic losses and extended frequency useage. the metalization allows a higher capacitance then the film and foil type caps.
different types of capcaitors are good for different situations. in the crossover, the caps are available in good values, are not polarized, and have better tolarance then electrolytics.
in switching power supplies, the caps are used for the extended frequency properties. likewise, in class D amps they are used for similar purposes on the output filter.
in industry, the higher voltage ratings are useful. this is sometimes useful in passive crossovers.
they are not polarized, and the poly-film construction results in low dielectic losses and extended frequency useage. the metalization allows a higher capacitance then the film and foil type caps.
different types of capcaitors are good for different situations. in the crossover, the caps are available in good values, are not polarized, and have better tolarance then electrolytics.
in switching power supplies, the caps are used for the extended frequency properties. likewise, in class D amps they are used for similar purposes on the output filter.
in industry, the higher voltage ratings are useful. this is sometimes useful in passive crossovers.
http://ampguts.realmofexcursion.com/JBL_BP1200.1/inside1.jpg
i assume you mean the blue boxes in pics like these. the larger ones are for power supply and power filter uses, the smaller ones are for signal processing.
the larger ones are used for better handeling of currents and higher frequency useage, the smaller ones are used because they are not polarized and have values that are close to advertised and don't vary as much with temperature.
i assume you mean the blue boxes in pics like these. the larger ones are for power supply and power filter uses, the smaller ones are for signal processing.
the larger ones are used for better handeling of currents and higher frequency useage, the smaller ones are used because they are not polarized and have values that are close to advertised and don't vary as much with temperature.
i can identify pretty much anything in the amps and give some possible uses.
in general the amp will be divided into a PSU -- Amplifier -- Signal processor.
the PSU converts the 12V DC input into a higher voltage, one suitable for the power output of the amp. something in the +-20V to +-80V range normally.
The signal processor does the gain adjust, and the lowpass/highpass filtering and bass boost. the PSU generally has a seperate +-15V, low power output for these.
The actual amplifier takes the signal from the signal processor, and uses the voltages from the PSU to generate an amplified version of the processed signal.
--
The PSU is usually comprized of a main power transformer, which is large, round, and wrapped with multiple colors of wire (in a lot of amps at least). there are often other inductors which look similar, but have only 1 or 2 windings. (2 windings could be a transformer or common mode inductor). there will be round cylinders which are capacitors.
the thing about caps that i will note is that people always say they are worthless. in the amp they are useful. the E = 0.5 C V^2 equation might show that only 1mJ is stored in a cap. 1mJ discharged in 1 second is 1mW. in a switching power supply, the cap might charge/discharge 100,000 times per second, which is a power transfer of 100W...
in anycase, the next PSU component is the MOSFET, which is a great device for low voltage switching power supplies. these are black squareish transistors mounted to the heatsink. note that the same package is used for many devices.
--
The amplifier itself is usually distinguished by a spattering of small components in the middle of the amp, and a few large resistors, and a number of large (or same size as the MOSFETS) power transistors. in class AB amps these are often BJTs. in class D amps they are MOSFETs. "Mosfet" is a buzzword in car audio, so it is listed on the amp's package, but in reality there are few if any MOSFETs in the actual amplifier part of the amplifier. usually there will be some large jumpers or bars taking the outputs from the middle of the board to the terminals of the amp (and there is usually a resistor and capacitor near the terminals).
in a class D amp, there will be some inductor and box capacitor to filter the switching of the class-D design. also a black box will house a relay that will disconnect the speakers in case of a failure.
--
the signal processor has a number of multiple pin rectangular ICs and a spattering of closely packed colorful components. and of course the controls for the signal processor.
in general the amp will be divided into a PSU -- Amplifier -- Signal processor.
the PSU converts the 12V DC input into a higher voltage, one suitable for the power output of the amp. something in the +-20V to +-80V range normally.
The signal processor does the gain adjust, and the lowpass/highpass filtering and bass boost. the PSU generally has a seperate +-15V, low power output for these.
The actual amplifier takes the signal from the signal processor, and uses the voltages from the PSU to generate an amplified version of the processed signal.
--
The PSU is usually comprized of a main power transformer, which is large, round, and wrapped with multiple colors of wire (in a lot of amps at least). there are often other inductors which look similar, but have only 1 or 2 windings. (2 windings could be a transformer or common mode inductor). there will be round cylinders which are capacitors.
the thing about caps that i will note is that people always say they are worthless. in the amp they are useful. the E = 0.5 C V^2 equation might show that only 1mJ is stored in a cap. 1mJ discharged in 1 second is 1mW. in a switching power supply, the cap might charge/discharge 100,000 times per second, which is a power transfer of 100W...
in anycase, the next PSU component is the MOSFET, which is a great device for low voltage switching power supplies. these are black squareish transistors mounted to the heatsink. note that the same package is used for many devices.
--
The amplifier itself is usually distinguished by a spattering of small components in the middle of the amp, and a few large resistors, and a number of large (or same size as the MOSFETS) power transistors. in class AB amps these are often BJTs. in class D amps they are MOSFETs. "Mosfet" is a buzzword in car audio, so it is listed on the amp's package, but in reality there are few if any MOSFETs in the actual amplifier part of the amplifier. usually there will be some large jumpers or bars taking the outputs from the middle of the board to the terminals of the amp (and there is usually a resistor and capacitor near the terminals).
in a class D amp, there will be some inductor and box capacitor to filter the switching of the class-D design. also a black box will house a relay that will disconnect the speakers in case of a failure.
--
the signal processor has a number of multiple pin rectangular ICs and a spattering of closely packed colorful components. and of course the controls for the signal processor.
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