Re: So, Todd at TNT Amusements apparently thinks I'm a liar

still doesn't make sense Kirb. jacking a voltage up and the current
going down doesn't jive. the only way it can go down is if the
impedance goes up and I don't see the component and the circuitry
making that happen. if you know what this non-linear component is and
its placement in the circuit, let me know and I'll admit I'm wrong.

I'm not contending whether there's any effect or not on the board and
its components. I'm just contending that the voltage isn't going up
and the current is going down for the same circuit. I'm basing this on
the impedance not being voltage driven. frequency I could understand,
but not voltage. it would have to be a non-linear circuit with voltage
dependent characteristics to make it happen.

if I run in to the chance to measure this I will but from an analog
electronics point of view, I don't see it. hey, I'm not saying you
didn't see what you claim, I'm just saying that there's more to it
than simply raising the voltage and seeing the current drop. the only
way you could conclude the power remained constant is if you saw the
voltage go up and the current go down proportionally so the power
stayed the same. for this to happen proportionally, it sounds like a
linear circuit design and yet the only way the current could drop is
if non-linear behavior was exhibited. if power is constant, voltage
goes up, current goes down, the only thing left to change is the
impedance. the only way the impedance would change is if it was
non-linear since the frequency and L/C remains constant. would love to
see what the spec sheet looks like for the components as well as the
schematic to see the parallel/series impedance. I bet there's
something else going on that's masking this proposal.


stevebo


On 18 Apr 2006 20:29:36 -0700, "kirb" <kirbseepe@xxxxxxxxx> wrote:


Steve C wrote:
Cody, the reason why this doesn't make sense is because is DOESN'T
make sense.

Really?

Where did this idea come from that the Power remains constant? This is
the problem with this whole discussion, the premise is off regarding
the power remaining constant and the assertion that raising a voltage
somehow caused the current to lower.

P=VI

What proof do you have that the power isn't constant? The basics are
this- raise the voltage to get more life out of the display. End result
is that the current draw isn't going up and killing the DMD driver
board.

and the resistance used in the formula isn't like a light bulb? the
impedance in any circuit consists of reactance (Xc and Xl) and
resistance. the combo is known as Z rather than R. the reactance is a
function of frequency which isn't changing and the inductance or
capacitance which also isn't changing. so without the frequency
changing and the inductors and capacitors aren't changing, it may as
well be like a light bulb's resistance because the impedance isn't
changing. by the way, there are neon lamps out there that exhibit
non-linear behavior so to say "this isn't a light bulb" isn't a good
analogy.

So, got any proof that boosting the 65 volt line is going to kill the
DMD driver board while extending the life of a DMD display? I do...and
it doesn't.

so yes, P=V*I but the Power is NOT constant. As the voltage is jacked
up, the current is also jacked up because the impedance didn't change.

Are you sure?

The result is the power consumption goes up as well.

Not in the case I measured.

increasing voltage and causing the current to go down can only occur
if the impedance in the circuit goes up. the only way the impedance
can go up is if it's a non-linear circuit that doesn't follow a linear
model when defining its impedance, or the inductor/capacitor values
are changing, or the frequency is changing. the frequency and
component L/Cs aren't changing and I highly doubt there is a
non-linear component in a pinball game that could cause the total
impedance of a circuit to go up when the voltage is raised.

This is a DMD plasma display. My basic point is- does raising the
62volt line cause more stress on the driver board? Answer- no.

so Cody, you're right regarding this whole thing not making sense. If
P did remain constant (I contend it doesn't) and the voltage was
raised, the only other thing that could change is the impedance would
have to go up. I'd like to know the name of the component and see its
relationship with the rest of the circuitry to show that it's causing
the overall impedance to actually go UP as the voltage is raised. I
don't believe it.

Crack out your DMD displays and do a little testing like I did.

Kirb

.

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