Some help with the PLL

Started by unknown · 6 December 2011 · 8 posts

1. Aurgus

   #1 · 6 Dec 2011

   I could use some help with the PLL circuit.
   Pin 3 (COMP_IN) of the 4046 looks like it goes to a .35 cap then to the emitter of the 2N2222.
   See actached jpg.

   attachment_10265 Capture.JPG

2. haxar

   #2 · 6 Dec 2011

   Looks like pin 3 of the 4046 is simply connected to the 0.35nf cap and then to ground. Where did you get the schematic?
   
   On the VIC card, pin 3 would be connected or through divide by n 4017 chips to pin 4 (VCOout) of the 4046.

3. Aurgus

   #3 · 6 Dec 2011

   That is part of the beast of a schematic I have been working on for a long time deciphering the PLL resonant driver of Stan’s.
   Now that the high res photo’s have been released (many thank you’s to Dan) I have made better progress. Evidently the divided by’s were not used, along with several other mods. In the past I have rushed out the gerber files to get boards to work with, only to end up cutting traces and adding jumpers. Trying not to repeat that as much.
   
   

   attachment_10267 attachment_10269 Capture2.JPG Capture3.JPG

4. Aurgus

   #4 · 6 Dec 2011

   BTW:
   The 100K pot is marked Gating.
   It is now corrected to "Range".

5. HMS-776

   #5 · 6 Dec 2011

   The WFC VIC in general discussions has a great deal of info...It's spread out over 80 pages but Don and TonyW both contribute a great deal there as far as the circuit goes....
   
   Page 61 shows a schematic of the 4046 and VIC connections by TonyW. Pin 3 of the 4046 actually connects to a 22K resistor and the neg side of the primary coil.
   
   http://www.ionizationx.com/index.php?topic=1513.300

6. Aurgus

   #6 · 6 Dec 2011

   Thanks HMS-776
   
   I somehow missed all that.
   Must stop working on this so late at night.

7. HMS-776

   #7 · 6 Dec 2011

   No Problem, that's what were all here for!
   
   

8. hydrogenmask

   #8 · date not recorded

   for your clarification
   
   HM

   attachment_10277 PLL investigation3 FINAL.bmp