PWM..... What is the attraction?
- Thread starter The_Professor_2019
- Start date
- th_trl_thread_readers 0
- Status
It's the Pima Cotton "Skein Effect"
Much more entertaining listening to AudioPhools talk skin effect on cryo'ed cables...
Skein Hash anyone?
Skein-512-512("The quick brown fox jumps over the lazy dog.")
658223cb3d69b5e76e3588ca63feffba0dc2ead38a95d0650564f2a39da8e83fbb42c9d6ad9e03fbfde8a25a880357d457dbd6f74cbcb5e728979577dbce5436
Skein-512-512("The quick brown fox jumps over the lazy dog.")
658223cb3d69b5e76e3588ca63feffba0dc2ead38a95d0650564f2a39da8e83fbb42c9d6ad9e03fbfde8a25a880357d457dbd6f74cbcb5e728979577dbce5436
Last edited:
Actually my old buddy Trog made the "Original" Screwdriver mod, and I still have mine.
circa 2009
Still have a few Keyring mods laying around, also made by Trog
Last edited:
I dunno, what's the attraction with any vaping mod? I have had several PWM devices and they worked great for high-power vaping and were simple devices with no screen - just a potentiometer to adjust the voltage/current output. My BJ Box Mod ran at a high frequency and used to "sing" when I fired it.
Am I missing the point?
I didn't know that there was a point.
PWM mods are kind of a 'blast from the past'.
add:
That made me stop & think.
I don't have a single vaping device that is still in production.
PWM mods are kind of a 'blast from the past'.
add:
That made me stop & think.
I don't have a single vaping device that is still in production.
PWM's are making a giant comeback. Things have changed. Not just a 555 timer anymore. NLPWM's might not do TC but they are hard to beat for the money and output.
Adaptability, longevity, customization.
Mech mod users bring up a great point. If the vapocalypse ever happens tube mechs will last forever. As will mechanical box mods.
PWMs can be put in about any box enclosure. Battery sled, potentiometer, fire button, 510 source, wire and solder. These things will always be available.
So, like mechs, PWMs will be around when Smok products are yanked off the shelf or have an outrageous sin tax put on them.
Like @dc99 said, they are not just timers anymore. I have a NLPWM that will tell me resistance, do VV and VW, lock and unlock, low voltage cutoff.
Mech mod users bring up a great point. If the vapocalypse ever happens tube mechs will last forever. As will mechanical box mods.
PWMs can be put in about any box enclosure. Battery sled, potentiometer, fire button, 510 source, wire and solder. These things will always be available.
So, like mechs, PWMs will be around when Smok products are yanked off the shelf or have an outrageous sin tax put on them.
Like @dc99 said, they are not just timers anymore. I have a NLPWM that will tell me resistance, do VV and VW, lock and unlock, low voltage cutoff.
The difference between buck and PWM. A buck regulator use a coil to store energy, which is successively switched into the load thru a diode. Here a capacitor can be used to smooth the waveform into DC.
A PWM regulator doesn't use a energy storage arrangement, it feed the partialised waveform into the load directly. So you get rattlesnake in heating coils, or strobe effects into LEDs.
A PWM regulator doesn't use a energy storage arrangement, it feed the partialised waveform into the load directly. So you get rattlesnake in heating coils, or strobe effects into LEDs.
Couple of things...
Although the screwdriver mods were just coming out when I made my sonic screwdriver. I was the first to make a variable voltage version. I actually used a Traco Power DC to DC converter to step the voltage up to 10v and then used a 340 regulator to then give me 0-10v adjustable output.
If there are any old cached files from the video chat we used to use, it is possible someone may find the video of me first firing up my VV. After that it did do a bit silly with many people doing variable voltage mods. The beauty of the Traco Power was that it was almost pure DC, and then the ripple was virtiavir eliminated by the 340.
The Skein effect is found when pushing high frequency through a wire. The higher the frequency, the more the electron flow moves to the outer portion of the conductor.... The skin.
So if you are using DC, you can use a solid wire. When you start to get higher frequency, you use multiple cores in order to create a bigger surface area (more skin) to lower impedance.
The wire below is used on one of our machines, this is capable of handling 10KW, and is one of 15 cables used to feed the machining head.
If we used the same cross sectional area, but with half the cores, we could only push 5KW through it.
Although the screwdriver mods were just coming out when I made my sonic screwdriver. I was the first to make a variable voltage version. I actually used a Traco Power DC to DC converter to step the voltage up to 10v and then used a 340 regulator to then give me 0-10v adjustable output.
If there are any old cached files from the video chat we used to use, it is possible someone may find the video of me first firing up my VV. After that it did do a bit silly with many people doing variable voltage mods. The beauty of the Traco Power was that it was almost pure DC, and then the ripple was virtiavir eliminated by the 340.
The Skein effect is found when pushing high frequency through a wire. The higher the frequency, the more the electron flow moves to the outer portion of the conductor.... The skin.
So if you are using DC, you can use a solid wire. When you start to get higher frequency, you use multiple cores in order to create a bigger surface area (more skin) to lower impedance.
The wire below is used on one of our machines, this is capable of handling 10KW, and is one of 15 cables used to feed the machining head.
If we used the same cross sectional area, but with half the cores, we could only push 5KW through it.
Attachments
True. But rattlesnake and strobe effect are an artifact of choosing a frequency that's too low. Designing those circuits to run at 33 Hz is what gave PWM a bad reputation.
Not an expert here, but I've blinked/dimmed a few LED's.
I think it's mostly a function of the clock rate of the microcontroller and the amount of range they want and the # of cycles they want to inflict on the cheap FETS. Cheap low-end controllers gets them in the low-Hz ranges.Charge pumps can "boost" too, and the PWM can "buck". It's a real low-cost way to pump some electrons to a coil without too much added material cost. The thing is, "how good is the algorithm?" How well does it adjust to battery voltage sag/change? Is it adequate to today's larger (high watt) devices?
I think the low-ohm craze has forced redesign and/or better designs with dedicated circuitry for better voltage regulation. That and time.
Just guesses and
Not an expert here, but I've blinked/dimmed a few LED's.
Charge pumps can "boost" too, and the PWM can "buck". It's a real low-cost way to pump some electrons to a coil without too much added material cost. The thing is, "how good is the algorithm?" How well does it adjust to battery voltage sag/change? Is it adequate to today's larger (high watt) devices?
I think the low-ohm craze has forced redesign and/or better designs with dedicated circuitry for better voltage regulation. That and time.
Just guesses and
I was trained in electronics in the early 70s. Back then 7400 series IC's were new and LSI was just ramping up. Thinking (correctly) that my job was about to change from analog electronics to digital, I would stop at Radio Shack once a week and pick up the latest chips for home experimentation. I'd breadboard circuits with those chips and chain them into something that would flash leds for visible output to understand what was going on at the pin level. I eventually managed to acquire an oscilloscope. All that paid off and it wasn't long before the company started testing tech reps to see who knew what about the digital revolution. I scored well on those tests and eventually became the local tech support guy on our team.
Nowadays, most electronics are single board devices repaired with a troubleshoot and replace policy and the part goes back to a centralized repair facility.
- Status
Similar threads
