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Had to buy a new charger, the old Nitecore SC4 is starting to act up on me. So new SkyRC MC3000 has been ordered, if you want @Fidola13 I can let you know how it works with my new Samsung 30T 21700 batteries.
And what I mean when I have said to round up resistance on some YiHi mods was. For example resistance reads at 0.159 ohms, round it up to 0.16 ohms.
But only do this after exhausting all other options first, as I stumbled across this and it resolved the rattle snaking issue that I was experiencing.
And what I mean when I have said to round up resistance on some YiHi mods was. For example resistance reads at 0.159 ohms, round it up to 0.16 ohms.
But only do this after exhausting all other options first, as I stumbled across this and it resolved the rattle snaking issue that I was experiencing.
You hit the nail on the head there! With a $30 Wismec mod on Arctic Fox F/W, you can achieve a better TC result than any Yihi Chip mod!!
The Rattle Snaking sound can be, but not always, common with PWM power sources. Pulse Width Modulation operates by rapidly switching between 0 volts to full voltage similar to a square wave. The duration of full on, vs full off creates an average voltage that is referred to as the Duty Cycle. So as an example, 4 volts with a 75% Duty Cycle will give an average of 3 volts. The rattle snake sound is the regulator switching on/off as per the Duty Cycle which depending on the frequency this may or may not be humanly audible (but measurable). Some PWM designs include hardware filters to suppress this noise, some Class D power amplifiers as a good example.
Not quite sure how Yihi regulates its power within TC. The specs states an output of 0.7 to 9.5 volts for the SX485. This leads me to believe it sets a voltage based on the prescribed Joules and resistance of the coil similar to how a DC to DC regulated device works - then scales back that voltage to control the temperature via PWM by decreasing the Duty Cycle percentage.
Technically by manually changing the resistance you are changing the output, which in turn is changing how the Duty Cycle operates thus moving that audible switching to a frequency that is no longer audible. Quick Google search displays some users having the same effect by adjusting their Joules output.
But one would think that a 0.001 ohms would not make so much of a difference. Interesting!
I definitely would like to know how that charger is especially if you have 30Ts since that’s the ones that seem to be the problem. The 40T fit much better. Maybe I got a batch of slightly longer 30Ts. Can that happen?
With the Yihi rattlesnake I just lowered the joules to about what if vape at watts plus maybe 2 or 3 joules.
I was using it like watts on a Omni and DNA Chip thinking to get to the set temperature faster. But the Yihis don’t work that with joules. As soon as I lowered the joules the throttling was gone.
Honestly I get a great temp control vape from the DNA, Yihi and then Omni chips. I know some people get all fanboy about a particular device- but I could care less as long as I get the vape I’m wanting.
Hey off topic real quick but when you get your SkyRC MC3000 and have some time with it please post a little review or just how you like it. Sorry for the thread drift and “Now back to your regularly scheduled program”
@madstabber, no worries. I can let you know what I think about it, going to need a cheat sheet for creating charging profiles for different batteries though. If I remember rightly, @Jazzman has had a MC3000 at their disposal for a little while.
And the only thing that I can think of with the 0.001 increase to the resistance seeming to resolve the rattle snaking issue, is it must be something to do with an algorithm in the firmware causing errata with the resistance reading and therefore power regulation.
But, rattle snaking is quite audible. First time you hear it you think that the mods broken or you broke it somehow, it's quite disconcerting.
And the only thing that I can think of with the 0.001 increase to the resistance seeming to resolve the rattle snaking issue, is it must be something to do with an algorithm in the firmware causing errata with the resistance reading and therefore power regulation.
But, rattle snaking is quite audible. First time you hear it you think that the mods broken or you broke it somehow, it's quite disconcerting.
If my mod rattled I would shoot it.
I get I'd be sorry but it would be reflexive at that point.
From my experiences in Tucson I would think, "A baby rattler got in there" and like, they are the SUPER venomous ones. No thank you.
Anna
I get I'd be sorry but it would be reflexive at that point.
From my experiences in Tucson I would think, "A baby rattler got in there" and like, they are the SUPER venomous ones. No thank you.
Anna
@My Batt Hurts, I'm expecting some classic Engrish in there.
Far from it - it's nicely written and very clear. But I'll not spoil it for you 
So it comes with a telephone directory or an OS survey map as an instruction booklet, at least it'll keep me entertained for a while.
Clarification….
Given many, including PBusardo and DJLsb, assumed SXMini’s output in PWM, I made the same assumption. They do not output in PWM for Temperature Control, but employs PFM (Pulse Frequency Modulation).
PFM operates in a similar fashion as PWN where the sum of on/off state dictates its output voltage. However, unlike PWM where the on state (Duty Cycle) can vary but at a constant frequency, PFM has a fixed on state interval but increases/decreases the frequency in order to modulate the voltage. As an example, the on state could be fixed at 1 millisecond, but the frequency (how many times) of on state over the duration of 1 second will be greater, for maintaining a constant voltage, or less, for reducing the voltage. Attached is a simple (and poor) diagram displaying the 2.
For those like me who has never heard this rattle snake noise, PBusardo’s took an audio recording of it in action. As Paul describes, if your wicks are wet, the sound is less noticeable for the device is not trying to modulate the voltage. As your wicks dry, the device begins to modulate, and the sound becomes more noticeable. Just to note, PBusardo does state PWM in this video, but his scope clearly indicates a PFM signal. This is not as apparent on DJLsb measurements. Paul does state in a much later video that the SX Mini outputs in PFM
Given many, including PBusardo and DJLsb, assumed SXMini’s output in PWM, I made the same assumption. They do not output in PWM for Temperature Control, but employs PFM (Pulse Frequency Modulation).
PFM operates in a similar fashion as PWN where the sum of on/off state dictates its output voltage. However, unlike PWM where the on state (Duty Cycle) can vary but at a constant frequency, PFM has a fixed on state interval but increases/decreases the frequency in order to modulate the voltage. As an example, the on state could be fixed at 1 millisecond, but the frequency (how many times) of on state over the duration of 1 second will be greater, for maintaining a constant voltage, or less, for reducing the voltage. Attached is a simple (and poor) diagram displaying the 2.
For those like me who has never heard this rattle snake noise, PBusardo’s took an audio recording of it in action. As Paul describes, if your wicks are wet, the sound is less noticeable for the device is not trying to modulate the voltage. As your wicks dry, the device begins to modulate, and the sound becomes more noticeable. Just to note, PBusardo does state PWM in this video, but his scope clearly indicates a PFM signal. This is not as apparent on DJLsb measurements. Paul does state in a much later video that the SX Mini outputs in PFM
Tpunk does this translate to real world vaping?
(the sx500 tc works flawlessly-ish in my eyes i did find one thing compared to dna but thats for a different thread il tag you if your interested)
is this is not just caused by user error settings ? dna snakes if setting are made by a id ot ,to high not as much but its there dna 200 250, not tested the 75 only have paired batteries here
watts/j set to high, massive power hitting the temp cutoff then re-applying power to keep the temp stable ??
old sx boards??
just tested here nothing with different builds on the 500
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What is user error, the rattle snake sound? I don’t know if I would call it user error, but it seems that the sound can be mitigated, should one wish, with a little fine tuning.
Just caught your edit. Who is Tpunk….me?
I am not implying there are fault(s) with how Yihi handles Temp Control. My above post was to inform users that Yihi uses PFM and not PWM (as many assumed) as a means to modulate the output with Temp Control. Along with a vid that demonstrates the rattle snake noise for those (like me) who have never heard it.
I have never used a Yihi device so no opinion on how well they work. I do not think using PFM, or even PWM for that matter, as a way to modulate power is of poor design….at least how it is applied with Yihi devices. It does however, at least in the case of Yihi, come with its drawbacks and that is a unique noise. It seems that noise can be mitigated by scaling back your prescribed power, which makes sense. The less the device has to modulate the power, the less likely you are going to hear the noise. But by reducing your power, one has to question whether you are reaching your desired temperature or not.
What does pms mean? I suffer from acronym and abbreviation deficiencies
I am not implying there are fault(s) with how Yihi handles Temp Control. My above post was to inform users that Yihi uses PFM and not PWM (as many assumed) as a means to modulate the output with Temp Control. Along with a vid that demonstrates the rattle snake noise for those (like me) who have never heard it.
I have never used a Yihi device so no opinion on how well they work. I do not think using PFM, or even PWM for that matter, as a way to modulate power is of poor design….at least how it is applied with Yihi devices. It does however, at least in the case of Yihi, come with its drawbacks and that is a unique noise. It seems that noise can be mitigated by scaling back your prescribed power, which makes sense. The less the device has to modulate the power, the less likely you are going to hear the noise. But by reducing your power, one has to question whether you are reaching your desired temperature or not.
What does pms mean? I suffer from acronym and abbreviation deficiencies
I have not heard any odd noises out my DNA’s (all 250c), but have heard similar pulsing sounds (can also be felt) from devices that output a poor and or noisy DC signal. Can also hear a high pitch whine from some chips, both while it was fired and after.
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