Astable VCO

extraordinary osc !!! astable without half of passive components and works perfectly. some minor redesign is only need to improve implementation. Some current source reduction for example. i'm not saying those are not need cuz give perfect stable operation and make calculus easier, but in cost reducing designs it will certain be a drawback cuz lots of elements is need to implement them especially another active device unles u want mess with passive inductor based one. I will try to replace them with taped resistor as most simple equivalent. decrease upper res values and no overall resistance will be raised. but one current source i will leato controll frequency in more stable and not so harsh way as by volt source itself. It will be perfectly stable in my opinion. But overall a worthy oscillator. great design and some refresh after 10001 ordinary always identical with book drawings astable led'o'vibrators.