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Battery Voltages -- Surprise!
not quite sure what you are getting at, rms applies to any varying voltage, it does not have to be a sine wave, this area of the discussion came into being as people where measuring the output of an ego battery with averaging meters and calculating power in the atty from that reading, it was... -
Battery Voltages -- Surprise!
the main thing I noted with the graphs was that there was very little difference between the RMS voltage for the 3Ω and the 1.6Ω, so I reckon the ego adjusting to atty resistance thing can be totally put to bed, it looks like some effort was made to regulate towards the rms voltage as opposed to... -
Battery Voltages -- Surprise!
would like to see the calculated RMS on the plot from the CRO peak and duty cycle measurements.. should match the CRO RMS though pretty well. -
Battery Voltages -- Surprise!
nice pics, so looks like the ego is regulating to 3.3Vave to me, the Vrms formula (/root(dc) agrees with the CRO pretty well. Vrms is dropping as the battery lowers which explains the drop off in performance I have noticed from a full charge to a flat battery, even though throwing a multimeter... -
Battery Voltages -- Surprise!
You didn't read my post thoroughly, I mention adding a capacitor and a diode, the cap will charge to the peak voltage and retain it while the ecig is off, something like a 1uF would do the job easily if the only load is a multimeter. So this rig measures peak voltage and another reading or... -
This bites - lost my ProVari
aaahh .. I get it now .. took me a few months .. american pie reference :) -
Battery Voltages -- Surprise!
hi peeps, had a good weekend ? summers on the way here :) Had a play with a spreadsheet to prove it to myself 100% .. The error between Vave and Vrms depends purely on duty cycle with these PWM waveforms. Vrms = Vave * √(100/dc) where dc is a percentage .. so 0 error at 100% up to... -
Battery Voltages -- Surprise!
the ego does PWM regardless of the load, any differences will be as pointed out above, due to the cell voltage dropping under load. This will affect the duty. I have some CRO waveforms of ego somewhere, it starts off at about 85% duty cycle and drops within a 100mS or so to a duty based on the... -
ProVari Variable Voltage Mod
heh, sorry dalton, didn't mean to snap .. I made the mistake of assuming you found that info somewhere other than provape, I can't see how they can call the output PWM, actually they don't, they say it uses that technology. I just double checked with my CRO and no PWM I know of will provide the... -
Battery Voltages -- Surprise!
you could make that or simply measure the peak voltage and duty cycle on a basement quality CRO and the power is = (Vp^2 * dc)/ R where dc is obviously duty cycle. Vp is peak voltage and will with all PWM mods be roughly 100mV or so below cell voltage. -
Battery Voltages -- Surprise!
average power is identical to the RMS power, it the sum of all powers over time, in which case you need the true voltage to calculate the square to give you power. you cannot derive average power however by using the average voltage, that is the whole point of the post. The sum of squares of... -
Battery Voltages -- Surprise!
you need to measure PWM with RMS meters to get an accurate reading if you want to compute power from it, power is proportional to V^2 not volts, non RMS meters read average voltage not RMS voltage .. take for eg a hypothetical (easy maths) mod regulating to 2V average .. if the battery was 2V... -
ProVari Variable Voltage Mod
I just love it when people spout their assumptions as the truth.. Wrong .. you want pictures ? , it ain't PWM according to my CRO. That likely makes it your standard run of the mill buck/boost .. probably a SEPAC, though not looked so I won't say it as fact. -
ProVari Variable Voltage Mod
The provari checks the battery under a several amp load, the multimeter does not, any losses due to the spring will add to the voltage drop. An older battery may well show a larger voltage drop under load than a newer one. The voltage detection cct is quite sensitive, cutoff at 3.2V monitored... -
What do you like to top your ProVari off with?
I use a liquinator on a 510-ego adapter but forget the dual coils, slot a standard boge carto and use it with the plastic on, works a treat. 0.63mm cutting disk and pretty much cut carto in half works great, usually on 4.0 to 4.5V. -
ProVari Variable Voltage Mod
I wrote that post before the spring upgrade. I got hold of a dozen of the new springs last thursday and have been distributing them to the aussie provari community.Feedback so far is very good, I can no longer feel the back end of the provari warming up at all. I gave up on the magnet long ago... -
This bites - lost my ProVari
Well I guess is just difficult to lose a provari. My thread on my lost provari ended up on a happy note as well. If I lost mine in a store, I reckon I would tell them that it is for applying special medicine for a brain disorder (nicotine addiction) and try some twitching or tourettes.. I... -
Is anyone getting a false "low battery" flashing led?
Re: noalox .. I would concur with that unless the materials where prone to corrosion in which case I guess it should help. It appears to made for aluminium. I will not be bothering with it on stainless steel. Surface contact across the threads will be pretty good anyway and a single application... -
This bites - lost my ProVari
My first leather work since about 1970.. -
Is anyone getting a false "low battery" flashing led?
ooh .. 666 posts, I see which side you bat for.