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Old 5th February 2012, 07:39 AM   #51
mogliaa is offline mogliaa  United Kingdom
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Quote:
Originally Posted by riccoryder View Post
I can see it now, homes of the future with 400 Hz power generated from solar power. "Faster refresh for your curve tracers". Adding a little positive feedback to a comparator turns it into a Schmidt trigger which could prevent erratic behavior if there's some noise on the power line sample used for the frequency reference. Sometimes it is more convenient to use the 40106B, 74C13, or 7413.
Thanks. Will add an Rf to the LM311.
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Old 5th February 2012, 11:19 AM   #52
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Originally Posted by avincenty View Post
Not pretty but should do.

Click the image to open in full size.
Hi Alfredo, is not clear in the picture. Can you please confirm the values of your PLL?

Resistor between pins 13 and 9 is 4M7?
Resistor between pin 11 and ground is 4.6K?

Many thanks
Ale
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Old 5th February 2012, 04:35 PM   #53
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Yes, those are the values.

Alfredo
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Old 7th February 2012, 04:57 AM   #54
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Quote:
Originally Posted by jackinnj View Post
IL300 is a bit faster than the HCNR200 -- I know as I bought a tube of them from a guy about 6 years ago. I think that there's a SPICE model for the HCNR200 floating around -- used to be on HP's website before they spun off Agilent, which was before they spun off Avago.
So many things to get samples of and try. I just ran across some information on Hall effect devices I will check out. I'm not sure how well they work at low currents, but they look easy to use. Allegro MicroSystems - 0 to 50 A Integrated Conductor Sensor ICs
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Old 8th February 2012, 12:52 AM   #55
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I read the data sheet today and unless I'm mistaken, I don't think those will be usable at low currents. Bummer because that looks like the perfect type of device for this type of application.
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Old 12th February 2012, 05:14 PM   #56
mogliaa is offline mogliaa  United Kingdom
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today etched the clock PCB and is working. Added the PLL to obtain a 2.5ms step and improve refresh. Slowly getting there...
cheers,
Ale
Attached Images
File Type: png curve tracer clock.PNG (15.8 KB, 502 views)
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Old 12th February 2012, 05:17 PM   #57
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Looking good Ale.
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Old 12th February 2012, 07:07 PM   #58
mogliaa is offline mogliaa  United Kingdom
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Hi Steven,
Thanks, here is the clock circuit... modified from your original design
Cheers,
Ale
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File Type: png Curve tracer grid driver.png (140.0 KB, 480 views)
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Old 13th February 2012, 12:59 AM   #59
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Glad to hear it worked. I've put mine on hold the past two weeks, have not been able to make time.

Are you able to align the start of the step to the plate drive signal without a phase control? Or is the sync control pot for the phase?
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Old 13th February 2012, 07:26 AM   #60
mogliaa is offline mogliaa  United Kingdom
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Hi Alfredo, it's just the clock board which I managed to build. Need to etch the anode and grid driver board,hopefully over the weekend if I get time.

Just realised that since I'm driving the LM311 with 100Hz and replicating your PLL taking the divider output from 4 I ended up with 2.5ms (400Hz) steps. I should reduce divider to get 200Hz otherwise with a 100Hz anode signal won't work properly?

Thanks
Ale
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