Maybe somebody here has another aproach than me. Any VCO i've seen has a non-linear relationship between input voltage and output frequenzy. On the other hand, The fixed pulse length circuit and the lp filter make a frequenzy to voltage converter, and that IS actually linear - and does only work in a limited frequenzy range.
Those two factor make this solution very simple to make, but will work within a limited freq range.
In your case, If you fine tune the timers so that 100HZ -->130HZ, then you'l discover that 150HZ input will output higher than 195HZ. That's because the relationship between output and input isn't linear but rather exponential.
You may use another stage between, a so called logarithmic amplifier. But that makes the circuit not so easy as you need to either calculate the antilog amplifier, or you have to spend a lot of time tuning it right.
Well, yes. But making real time freq converting (as good as no delay between input/output) I cannot see how to do this without using some sort of multitasking.
Maybe I think a little too difficult?
Well, yes. But making real time freq converting (as good as no delay between input/output) I cannot see how to do this without using some sort of multitasking.
Maybe I think a little too difficult?