thank you edavid , coromonadalix , schmitt trigger
i will read about the Vactrol ,
i will do a full mathematics, i don't know how long ti will take , maybe a day or 3 , depending on whats going on , but i will goood enuth i hope , started lerning Ki-cad yesterday , so i hope to be able to simulate it whit Lt Spice , when i figured that one out. i will post results when i have tested the component , in different voltage corresponding to resistance. probebly only a few mesurements , becus maybe 5 just to get somtfing to go on (if it works) else i will tear it apart and see if i can replace the fullty part. and try to capture it on video.