| Author |
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Sixkiller505
| | Posted on Saturday, July 05, 2003 - 10:08 am: | 
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i see that the klv 550 uses 422's from time to time they seem to be rated at 125watt per pill,so why do you think no one has made a 4 -5 or eight pill box.it wuold seem that you would not have to drive it as hard as the 2879's to get the same effect,therefore making a cooler box with a longer life.anybody feeling it??? techs as well as forum members??? |
Znut
| | Posted on Saturday, July 05, 2003 - 5:03 pm: |
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28 volt device |
Taz
| | Posted on Saturday, July 05, 2003 - 8:45 pm: |
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28 volts baby... |
Bigbob
| | Posted on Saturday, July 05, 2003 - 9:22 pm: |
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Znut;voltage doubler circuit using heavy duty industrial rectifiers,why not? |
Znut
| | Posted on Sunday, July 06, 2003 - 11:47 am: |
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You would end up pulling 30% more current from your vehicle's system to make up for the efficiency of the transistors and diodes needed to step up the voltage.
A 24V system may work (actually what, 26 or 27 volts?) but 28 - 30 volts would be needed to put out any more wattage than 2879's. |
Taz
| | Posted on Sunday, July 06, 2003 - 2:30 pm: |
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you might be able to run it on a 24 volt system, say in a big rig but still missing 4 volts so a form of stepup transformer would be nessicary and alot of batteries. |
Sixkiller505
| | Posted on Sunday, July 06, 2003 - 4:39 pm: |
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znut and taz, thanks guys so that's the catch!!!i figured it most have been something!!!"BIGBOB"? i think that someone will try it!! you know that on the comp line,they volt up the 2879's to 20 volts anyway and use faraud copacitors to store up power so the batteries don't drop as fast.since most amp designs are basicly the same,all we need is a pioneer to start a new trend. then everybody will start!!oh well we will see!! thanks!! ps i'am asking x-force and i will see what they say and let you know!! sixkiller505 |
Znut
| | Posted on Sunday, July 06, 2003 - 8:04 pm: |
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"A 24V system may work (actually what, 26 or 27 volts?) but 28 - 30 volts would be needed to put out any more wattage than 2879's."
422's, 1407's, 1477's. All operate 28V nominal. Better at up to 32V. A hefty alternator will run 2879's beyond their 120 watt rating because they put out 14 to 14.7 volts.
The higher voltage transistors are used in base amps because the mfr's can use cheaper power supplies. Twice the voltage means half the amperage. On top of that, to step down from 110 AC means a smaller transformer for 28 volts than 13.8. As well as less load on the diodes and regulator(s).
28 volts is better than, say 55 volts(the peak DC potential from 110 AC) because it leaves headroom for regulation and suppression of those dreaded "ripples".
Those 2879's have earned their reputation and when matched and driven correctly will usually deliver extremely well. The MRF 422's will wimp out way before 2879's. |
Taz
| | Posted on Sunday, July 06, 2003 - 8:36 pm: |
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;) |
Bigbob
| | Posted on Sunday, July 06, 2003 - 10:55 pm: |
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Most charging circuits today are 14 to 16 volts,the new aloy plates in batteries allow this with no damage,thus faster charge rate,you could run a cascade voltage doubler with four diodes and an extra filter cap,28 to 32 volts is in reach.But why bother,at 98 bucks each(sd1407) it would be a very expensive endeavor,plus 30 amp diodes are nearly as costly,U R right stick with the tried and true,was wondering though why are there no pills in the 300 or 400 watt range for 2 to 30 megs at 13.8 volts? |
Sixkiller505
| | Posted on Monday, July 07, 2003 - 9:26 am: |
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ZNUT YOU ARE RIGHT!! i asked x-force and they said it would be costly and would the price be worth it.did'nt say they would'nt do it,but basicly did i want to pay the price.BIGBOB!!you are like me alway's thinking what if,and ruling out nothing!!today's dream are tomorrow's WHAT???alrighty then.when ever someone's thinks up something and somebody says no,some silent inventor/builder rethinks it and builds it and them people who said no copies it.IT NEVER FAILS!! sixkiller505 |
Znut
| | Posted on Monday, July 07, 2003 - 10:11 am: |
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I didn't say no, I say it would be a pain in the ***! And, not really be worth it for a couple more watts per pill than 2879's. |
Kc0gxz
| | Posted on Monday, July 07, 2003 - 11:33 pm: |
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Hey guys
What's the point in going through all of that for a couple of 28 volt 422s when a couple of 2879s will do the same thing at 12 or 13 volts.
Just curious.
Jeff, kc0gxz. |
Bigbob
| | Posted on Tuesday, July 08, 2003 - 7:04 pm: |
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I answered my own question,a 600 watt fm pill is 400$,WHOOOEEEE! |
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