Klaas Robers wrote:Today I received the new Newsletter and in it Karen Orton writes that her optical proximity detector gives a sine wawe rather than a square wave. So this looks to be normal. Then it is useless to extract a sync pulse from, too uncertain. However to use it for speed control might use as the mechanical system is too slow to follow the jitter in the optical output pulses.
So Harry, nothing unusual with the optical read out. If you want to know more, ask Karen. The MUTR NBTV monitor also uses this optical sensor and PLL servo for speed control and it works.
Hi Klass
I am a bit on and off with the member ship so i have not seen Karens work on the proximity detector unfortunately ,this is the first i have heard of it but i gather she is using it as a replacement for the current methods for producing mechanical sync perhaps ? any case interesting .
Funny enough i have been looking into all of the motor control today ..
A while ago i mentioned to Gary the problem seems to be around the PLL and pretty much nothing out of pin 13 ,running the PLL on 5 volts nothing ...i swapped over to the 12 volt supply and i get a quick sign of a pulse and it disappears ..
So adjusting the voltage to 11.55 volts it appears fine now what i don't understand is why this CD4046BE Pll is so voltage sensitive ...i swapped over the ic but same result i want to track down another version as it could be just this version of the ic playing up .
Took me most of the day looking into seeing if i could improve the sync pulse trying to straighten it up its a bit better it does seem to be the position angle and such from the encoder ......other factors like at the moment out of range repositioning i will have to look again when i have time to see it that helps more .
I really need to get the motor control working again and as you say Klaas it should work ,i will just need to stick with it ...having a pulse out of the 4046 now should help !
BTW pin 9 at times is shown to be grounded other schematics of this motor control its just pins 5 and 8 ...why is this so....?