In the pll the bandwidth is controled by the resistor 1 and capacitor, this determine the minimum frequency and maximum frequency it would lock varying the input voltage at pin 9 from 0 to vcc... also a off set can be included maintaining the bandwidth but allowing another frequency range... it actualy change a little the bandwidth increasing a little at the same time as the frequency off set when the r2 is lower...
i will be using this to convert the rpm of the car to a voltage signal... for using a rpm gauge and for some ideas of injecting hydrogen proportionaly to the number of injections to see if it would help in the combustion efficiency..
this voltage signal will vary the pulse width of a low frequency generator made with an opamp and a 555 timer.. old sebos gate ckt..
the voltage output may come from the demodulated output on the pin 10 of the pll since its just a voltage follower coming from pin 9 signal already..
i´m thinking to use an opamp to be able to create off set in the signal if required on tuning of the car...
basicaly i´m finding my way to use the gas but control its production on demand automatically..
probably it will take few ics and parts..
regarding milleage i found that my car having a old malfunctioning fuel pump makes me an economy of more than 10% so i will design also a current limiter for fuell pumps so anyone can add it and control the pressure of the injection on its car.. this would allow longer injection cycles in first glance but the injection cycles may also have a limit and here is where it will start to cut the fuel being injected by some extent...