I've been working on this off and on for over a year. I have a pulse width modulator (pwm) circuit designed and tested which controls the heat level.
![[IMG]]()
![[IMG]]()
It also has MOSFETs configured to control polarity and switch the coil on and off (pic directly above). The other side has a timing chip which pulses based on the rheostat setting you pick.
![[IMG]]()
...
the Pulse
![[IMG]](http://i.postimg.cc/2jh7Cskx/brdTop.jpg)
![[IMG]](http://i.postimg.cc/TYxq1thv/brdBot.jpg)
It also has MOSFETs configured to control polarity and switch the coil on and off (pic directly above). The other side has a timing chip which pulses based on the rheostat setting you pick.
![[IMG]](http://i.postimg.cc/m2S3H7Fz/abv.jpg)
...the Pulse