Steve Anderson wrote:Yes, quite novel, but be warned, the two oscillators are free-running, they are not locked together. So the number of steps per ramp can vary and drift depending on supply volts, temperature and component tolerances. But if it's what you need then all is OK.
Steve A.
Hi Steve i must admit i was curious what you thought ..
Yes the opamp oscillator is free running i have no interest in this part of the circuit at all only as a demonstration it has a use .
I think the 555 is locked to the free running opamp oscillator via the reset pin 4 but i agree the 555 can be a less than a precise chip needs a regulated supply ...no one here likes oscillators drifting ..... disapproval frown !
I think a sync detection circuit replacing the free running opamp and syncing a oscillator or to a monostable then to the reset of the circuit will be more interesting
Your DAC circuit i am using in the PMT camera works great i am very grateful as i knew nothing of this before you showed me but i did have to replace the clock with a crystal version the 4046 at 3mhz drifted a bit even on a crystal clock it took me a while to adjust components to it to stop any slow drifting .....So both ideas digital and this analog both have their weaknesses and strengths.
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.