Found in a 90’s Popular Electronics, this circuit can use other power MOSFETs. The transformer has a primary according to the desired continuous voltage at the output.
This circuit can use NTCs from 200 to 680 ohms, just change P2. For 200 ohms use 330 ohms, for 250...
This circuit was found in an Electronic Design from the 90's. It makes use of components from the...
This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no...