Timeline for Oscillator not running
Current License: CC BY-SA 3.0
23 events
| when toggle format | what | by | license | comment | |
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| Aug 22, 2016 at 4:09 | comment | added | Analog Arsonist | Did you have capacitors on the oscillator side of the ferrite bead? | |
| Aug 22, 2016 at 3:20 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jul 24, 2016 at 12:01 | comment | added | JHinkle | Elecrow. They did a nice job and were a pleasure to work with. Start to Finish in 4 to 5 weeks. Priced with another supplier, they were both in same ball park. So far, I am happy and will use them again. | |
| Jul 23, 2016 at 4:11 | comment | added | Bradman175 | Maybe off topic but I was wondering who made your boards? The only selections I can see on the internet are not friendly for mass production. | |
| Jul 23, 2016 at 2:42 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 22:58 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 2:39 | history | tweeted | twitter.com/StackElectronix/status/756317789078556672 | ||
| Jul 22, 2016 at 2:04 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 1:18 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 0:48 | answer | added | SamGibson♦ | timeline score: 1 | |
| Jul 22, 2016 at 0:35 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 0:28 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 0:14 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 0:12 | comment | added | SamGibson♦ | Thanks for the images. The photo is a bit blurry and doesn't show much PCB around the osc. I'm worried that we can't see C21 (the decoupling cap for the osc). How far away is that cap? Also there seem to be solder splashes from the PCB pads for the osc, to the silkscreen for "U10". Is that true? Any chance of the splashes being relevant? I know you are concerned about the freq - but that is only one of the issues in what you originally said. The other is the sine wave instead of correct square wave o/p. Excessive cap loading could have been the cause, if you used a x1 probe, but now answered. | |
| Jul 22, 2016 at 0:08 | comment | added | JHinkle | Scope probe max 15 pf. Show nice square corners on square wave test signal 1 khz. What concerns me is the frequency of the output - nowhere near 25 mhz | |
| Jul 22, 2016 at 0:02 | history | edited | JHinkle | CC BY-SA 3.0 |
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| Jul 22, 2016 at 0:01 | comment | added | SamGibson♦ | Thanks for that response to points (c) & (d). That gives me something to think about. I look forward to the others :-) Regarding adding pictures - there are several ways; easiest is to use the icon above the edit box, which looks like a couple of mountains (just to the right of the "{}"). | |
| S Jul 21, 2016 at 23:58 | history | suggested | SamGibson♦ | CC BY-SA 3.0 |
Added link to PDF datasheet for the oscillator & fixed one mis-spelling of OCS->OSC
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| Jul 21, 2016 at 23:47 | comment | added | JHinkle | I added no additional capacitance. The 5-7pf are from the chips typ and max specifications. How do I add pictures? Sinewave 0 to 3.3v | |
| Jul 21, 2016 at 23:45 | review | Suggested edits | |||
| S Jul 21, 2016 at 23:58 | |||||
| Jul 21, 2016 at 23:37 | comment | added | SamGibson♦ | I can think of a few possibilities - but to help include/exclude some things: (a) What 'scope probe are you using to measure the output from the oscillator? (b) What capacitive loading does it have, according to its specification? (c) "Both the ARM and PHY had 5-7 pF at the EXTAL inputs." Do you mean that you added 5pF-7pF capacitors to these inputs, or something else? It would help to see the schematic (or even just the currently relevant parts) and a photo of the board (in case something "jumps out", which we won't guess without seeing it). (d) What is the pk-pk voltage of the sine OSC o/p? | |
| Jul 21, 2016 at 23:10 | history | edited | pipe | CC BY-SA 3.0 |
Removed signature, fixed some units
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| Jul 21, 2016 at 23:04 | history | asked | JHinkle | CC BY-SA 3.0 |