I've retired from an electro/mechanical test job so now I work on my grand daughters toys(that's what grandpa's do you know . I need help with a soft start controller to prevent the jumping that her electric car does when she drives it... at 5 years, she's afraid to use it because of the jumping(in either direction). a adjustable ramp up speed would be helpful.. Two seperate timer circuits with diodes to select for forward or reverse?