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In Reply to: Recommendation for Power Conditioner/Surge Protector posted by goooch on August 1, 2006 at 14:24:42:
Dont plug power amps/powered subs all into a single power stripPutting all your power amps into a single power strip is bs
You ever turn on a single power amp and see the lights dim in your room?
Run power amps straight into the wall
Run your low powered stuff/digital into an isolation transformer with filters and surge protection
A unit is about 500.00 and up
The cost involved is all the copper windings in the transformer
itselfJust an isolation transformer will not stop surges
An isolation transformer gives you a pure sine waveAn isolation transformer has to have filter chokes and surge
suppression built with the unit to stop spikes and surgesYou could purchase one of these and plug it into a quality
surge unitIf you really want performance you can hear out of your gear
use isolation transformers
Follow Ups:
"An isolation transformer gives you a pure sine wave"
Just like any transformer an isolation transformer passes the same waveform out as comes in, or at least it it should. The advantage to an isolation transformer comes when you wire it to give a balanced output, at which point the output has the same common mode rejection characteristics as balanced lines. To take maximum advantage of that it should be mounted as close as possible to the AC panel. What works even better is a 220 to 110 transformer, that way any junk picked up on the AC transmission lines is also eliminated via common mode rejection.
I suggest you look at the input waveform on a scope and the output
waveform from an isolation transformer
The windings are 1:1
Not only does it totally block any DC on the waveform it also
totally eliminates ground loop hum
In other words if you look at a noisey AC waveform going into
an isolation transformer you will see a clean sine wave on the outputUsing Capacitance and surge suppression after the transformer
will give you clean ACThe medical field and the military must have a clue on proper AC
conditioning because they use them for AC conditioningMy whole point in this is using a freegan computer power strip
with chokes and MOV's is not thourough AC conditioning
:)
Bill is correct; the isolation transformer by itself will pass a waveform similar to what goes into it. The transformer by itself is not a line filter; cleaning noise, etc., from the AC line requires filtering.DC is not a concern on AC power lines, largely because the power is distributed as AC through transformers, but also because no utility company that I know of puts batteries on their power lines.
Also, an isolation transformer does not necessarily correct ground loops.
The transformer acts as a band-pass filter, which will not only block DC voltages (many components operate less effectively in the presence of DC), but block high frequency noise (the transformer coils act as an RF choke). Secondly, if the transformer provides balanced AC out (+ 60 Volts on one leg and - 60 Volts on the other leg), any noise that is picked up by components' power cords and extension cords is cancelled through common mode rejection (CMR). This happens when the balanced legs are combined to produce 120 Volts. Because the noise is the same polarity on each leg, but the voltage is inverted on one with respect to the other, the noise gets cancelled out between the two AC voltages. Also, a benefit with balanced power is that you are then placing the
ground, which may be referenced one way or another by the signal circuits, in the "eye" of the hurricane, so to speak, of the power currents of the AC line, so that the ground itself is cleaner, providing a cleaner reference for the signal circuits.
Once again...I am merely making the point that an isolation transfomer with
filter circuitry is the ultimate AC power conditioningI didnt specify the wiring of the transformer
You can research it til the sun goes down and the bottom line is
what is the best power conditioning available from the trash
that is fed to your home from the electric company
"the trash that is fed to your home from the electric company"I'm afraid you've fallen victim to the hype. The AC power going to your home does so in a balanced configuration until it gets to your home's distribution panel. 99.9% of the trash present on unbalanced 110-0 outlets is generated within the home.
"block DC voltages"
What is the source of these DC voltages?"The transformer acts as a band-pass filter"
To the extent that it does, so do the AC transformers in the devices being powered. Luckily, the bandwidth of transformers is extremely wide, otherwise transformer coupled input and output stages wouldn't work very well.You quotes all appear to be sourced from advertising copy. Yes, balanced power is the best solution to noise on AC lines, but the rest of the quoted material is just so much piffle.
I have taken a tour a company that put together huge UPS units
I saw the trash garbage the electrical companies feed the consumer
The electricity fed to your home is so filled with garbage and noise
and spikes and sags its ridiculusThere is a reason they put isolation transformers with protection
on medical equipment and use them in the military
There is no hype in itHigh quality isolation and filtration is the only way to go
Im dropping this subject
The AC power I've looked at is pretty clean. I think what they showed you was probably a rare situation.
"My whole point in this is using a freegan computer power strip
with chokes and MOV's is not thourough AC conditioning
:)"
Of course it isn't, my point is that's what you're usually getting for even hundreds of dollars. Even voltage regulating conditioners with tapped transformers don't do any better a job of actually cleaning things up than the average $19.95 power strip. A transformer can have a drastic effect, but only when it's used to provide balanced power rather than the usual unbalanced AC. The hype about both the necessity and the effectivness of so-called power conditioners is almost as absurd as that of the cable shysters, and it should come as no Monster of a surprise that in some cases the source is the same.
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