Question on the 4046
Posted: Wed Nov 30, 2011 6:56 pm
I am close to trying to sync my monitor i am just wondering if any one has tried Steves pulse cleaning shaping ideas in these circuits ?
i am also just wondering since it must be a few years old now things tend to be updated ,i know its our job to experiment but apart from Holtzmans go at syncing there really isn't that much to choose from ...for newies to this which i am really to as i have never really tried this on a mechanical monitor .
Some ideas i have which i am wondering about for a start in this circuit as i always like changing things to whats in the junk box ..
The Opto fork this could be replaced with a led and LDR ,i used to think the ldr was sluggish but as again Holtzman has shown it is more than fast enough.
i am also wondering due tothe size of the LDR over the light S transistor or diode would this help in it seeing the light pulses better ...i can see a wobble in say a nipkow disk causing a missing pulse if a hole is half seen by the transistor...mmmm
Now the end part of the circuit i have been thinking about also ....Now i am just using LM317 to control my motor speed the Pot to control the speed is of cause manual i havebeen toying with the idea of instead of using the mosfet part of the circuit why not control the LM317 via the trim pot Automaticity,i started off thinking of hooking up a LDR to it this would change thevoltage out ...and you could fine tune it with a trim pot in series ....then i was thinking why just do the same via pulses ...think it would work
Just some ideas
Also thinking Of doing away with the PLL using 2 555 timers the first for a monostable this for the opto fork ...the second a astable the sync into pin 5 output into pin 5 of the monostable output of the monostable to what ever you want to drive your motor.
Now i would be interested if anyone thinks it might work or shoot me down in flames i don't care ,what matters is what works
advice is always appreciated!
i am also just wondering since it must be a few years old now things tend to be updated ,i know its our job to experiment but apart from Holtzmans go at syncing there really isn't that much to choose from ...for newies to this which i am really to as i have never really tried this on a mechanical monitor .
Some ideas i have which i am wondering about for a start in this circuit as i always like changing things to whats in the junk box ..
The Opto fork this could be replaced with a led and LDR ,i used to think the ldr was sluggish but as again Holtzman has shown it is more than fast enough.
i am also wondering due tothe size of the LDR over the light S transistor or diode would this help in it seeing the light pulses better ...i can see a wobble in say a nipkow disk causing a missing pulse if a hole is half seen by the transistor...mmmm
Now the end part of the circuit i have been thinking about also ....Now i am just using LM317 to control my motor speed the Pot to control the speed is of cause manual i havebeen toying with the idea of instead of using the mosfet part of the circuit why not control the LM317 via the trim pot Automaticity,i started off thinking of hooking up a LDR to it this would change thevoltage out ...and you could fine tune it with a trim pot in series ....then i was thinking why just do the same via pulses ...think it would work
Just some ideas
Also thinking Of doing away with the PLL using 2 555 timers the first for a monostable this for the opto fork ...the second a astable the sync into pin 5 output into pin 5 of the monostable output of the monostable to what ever you want to drive your motor.
Now i would be interested if anyone thinks it might work or shoot me down in flames i don't care ,what matters is what works
advice is always appreciated!