i decided to build my encoder position counter from standart CMOS 4000 IC's .
but i have another problem .
to control position , i need a motor with encoder and a servo driver .
i have to supply the servo driver with speed feedback .( i dont want to use a tacho becouse it adds another 100 $ to system costs )
i have to convert encoder pulses to voltage .
but it must be very linear if u think the speed range from few rpm's to 2000 or 3000 rpm of the motor .
does anyone have an idea , is there a highly linear F to V converter on the market ?