What would those be? I'm curious, and would like to hear other options out there. Are you perhaps referring to DNA20 mods? If so, which ones?
The following come to my mind.
Whatever bucking regulators are used in BuzzPro, Saber Max, etc. (there are several chips and circuit variations out there). This class of regulator tends to need a HV setup of at least 5v (while there are some 3.7v exceptions that don't go as high). That means stacking batteries, possibly some sort of LiPo battery pack, or possibly using something like an 18650 5v NIMH cell.
Evolv LLC Units:
Darwin PCB (Similar to the DNA12) (Has display)
Kick 1 5-10 Watts [12 Watts with some atties] (No Display...uses POT to adjust)
DNA 12 5-12 watts (Can be helixed for 24 Watts - No display - POT Adjusted)
Kick 2 5-15 Watts (No Display...uses POT to adjust)
DNA 20D 5 - 20 Watts (Display Optional - POT or 2 Button adjusted)
Artisan vaping Units:
Crown V1 VV 3.4V - 5.6 Volts (Audio Feedback - Fire button click to adjust)
Crown V1 VW 5 - 10 Watts (Audio Feedback - Fire button click to adjust)
Crown V2.0 VW/VV - Similar specs to V1 but VV and VW on same chip (Audio Feedback - Fire button click to adjust)
All DNA, Kicks, and Crowns provide short circuit, heat, and low voltage battery protection.
These range in US prices from $30 to $45 new.
All of them can handle coils down to about 1.3ish Ohms or so, maybe lower depending on your 'unit' and MOD conductivity.
DNA 20 and Kick 2 can take coils down to 0.5ish Ohms.
I'm not sure if any of these use PWM or if they are all DC based...some might even be hybrids of PWM and DC.
They all have smooth signals like the Provari (provided they are in decent mod with good conductivity).
There are also imported Kicks these days with specs similar to the Kick 1. I have no idea how well these work but they do tend to cost about the same or less than a ShortStop or VapeSafe PTC fuse at typical vape shops these days, which I find truly odd.
Please don't get me wrong, a good Regulator alone doesn't make a good MOD. The whole package counts big time, and Provari delivers one of the best total packages on Earth.
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