| Erik Malund 09/13/07 06:02 Read: 291 times Mt Airy, Nc USA |
#144562 - I can't really 'read' your PCB but ... Responding to: Rubem Pechansky's previous message |
.. it seems to me that only one side of the crystal is connected.
Erik |
| Topic | Author | Date |
| 89C2051 oscillator does not oscillate (?) | Rubem Pechansky | 08/06/07 17:08 |
| Capacitor value? | Russell Bull | 08/06/07 17:58 |
| 20-40pF indeed | Rubem Pechansky | 08/07/07 08:00 |
| it might be the crystal | Jan Waclawek | 08/07/07 08:05 |
| Probably not | Rubem Pechansky | 08/07/07 08:24 |
| because it\'s crap | Jan Waclawek | 08/07/07 08:31 |
| Not same position | Rubem Pechansky | 08/07/07 08:38 |
| one cap or two makes most probably no difference.. | Jan Waclawek | 08/07/07 09:38 |
| Not on the pins | Rubem Pechansky | 08/07/07 11:45 |
| I'd recomend you re-read the spec's ... | Richard Erlacher | 08/07/07 13:08 |
| It's the same Vcc | Rubem Pechansky | 08/07/07 17:14 |
| Hhm...I wouldn't recommend this paralleling | Kai Klaas | 08/07/07 09:51 |
| hummm... really? In what frequency range? | Jan Waclawek | 08/07/07 10:00 |
| The inductance of the left resonating with... | Kai Klaas | 08/07/07 10:17 |
| interesting | Jan Waclawek | 08/07/07 10:35 |
| Spice models | Kai Klaas | 08/08/07 08:57 |
| Thanks, Kai. | Jan Waclawek | 08/08/07 09:18 |
| Numerical calculation, some examples... | Kai Klaas | 08/09/07 12:09 |
| Wrong reset scheme! | Kai Klaas | 08/06/07 22:24 |
| 10µF reset capacitor to Vcc | Rubem Pechansky | 08/07/07 08:06 |
| Isn't that the mfg's recommended circuit? | Richard Erlacher | 08/07/07 13:10 |
| Which do you mean? | Kai Klaas | 08/08/07 11:43 |
| 10 uF to Vcc and 8.2K (built-in?) to GND | Richard Erlacher | 08/09/07 00:24 |
| no, it is not | Erik Malund | 08/13/07 11:10 |
| If it's in nearly every datasheet ... | Richard Erlacher | 08/13/07 12:55 |
| this is your perception of the things, Richard | Jan Waclawek | 08/13/07 13:04 |
| Here we go again ... | Richard Erlacher | 08/13/07 18:37 |
| ... and again... | Jan Waclawek | 08/13/07 23:22 |
| I don't know what to say ... | Richard Erlacher | 08/14/07 02:50 |
| there is NO out of spec power supply | Jan Waclawek | 08/14/07 03:36 |
| Not only... | Kai Klaas | 08/14/07 07:34 |
| Not allways | Daniel Contarino | 08/15/07 12:24 |
| Have you seen evidence of improvement? | Richard Erlacher | 08/19/07 09:55 |
| Wider spectrum | Kai Klaas | 08/19/07 11:51 |
| maybe ratio of good/bad crystals is the same... | Jan Waclawek | 08/19/07 14:16 |
| In all the various designs I produced ... | Richard Erlacher | 08/19/07 17:10 |
| Never had a failure until now | Grant Beattie | 08/20/07 13:16 |
| I know of lots of crystal problems... | Kai Klaas | 08/21/07 12:02 |
| Could be, but I've never encountered it ... | Richard Erlacher | 08/21/07 12:32 |
| %$#@! Double-post again ... | Richard Erlacher | 08/21/07 12:32 |
| ^%$#@! double-post ... | Richard Erlacher | 08/19/07 09:55 |
| If the datasheet says 1 ms ... | Richard Erlacher | 08/19/07 09:58 |
| more about locomotives | Erik Malund | 08/14/07 06:59 |
| symptoms suggest ... | Richard Erlacher | 08/19/07 10:09 |
| steam locomotives | Erik Malund | 08/13/07 13:15 |
| I like the steam locomotives | Jan Waclawek | 08/13/07 14:26 |
| So do I | Steve M. Taylor | 08/13/07 15:05 |
| me too, said the dog | Erik Malund | 08/13/07 15:10 |
| The kids should be smarter than that! | Richard Erlacher | 08/13/07 18:39 |
| kids are kids | Erik Malund | 08/14/07 06:46 |
| It might not be a clock problem | Stanley Lio | 08/06/07 22:31 |
| Does not work, sorry | Rubem Pechansky | 08/07/07 08:31 |
| Bad Connections or Crystal ? | Richard Houghton | 08/07/07 08:17 |
| A picture may be useful | Rubem Pechansky | 08/07/07 08:28 |
| Breadboards are highly unsuited for micros!! | Kai Klaas | 08/07/07 10:09 |
| Makes sense | Rubem Pechansky | 08/07/07 11:48 |
| breadboards are highly unsuited for ANYTHING! | Richard Erlacher | 08/07/07 13:11 |
| Not at all! | Kai Klaas | 08/07/07 22:26 |
| If you look at the pictures you can see why. | Richard Erlacher | 08/08/07 07:24 |
| Yes, it doesn\'t look properly, but... | Kai Klaas | 08/08/07 08:31 |
| It's too risky! | Richard Erlacher | 08/09/07 00:40 |
| What is the purpose of your posts?? | Kai Klaas | 08/09/07 09:30 |
| My purpose is to point out that there are flaws | Richard Erlacher | 08/09/07 10:43 |
| *** THE PICTURES *** | Rubem Pechansky | 08/07/07 12:04 |
| Problem may be breadboard | Ralph Sac | 08/07/07 12:26 |
| Breadboard correction | Ralph Sac | 08/07/07 16:12 |
| How I programmed the 2051 | Rubem Pechansky | 08/07/07 17:55 |
| Must be continuous | Rubem Pechansky | 08/07/07 17:23 |
| there is a good english word \'IS\" | Erik Malund | 08/13/07 11:11 |
| I have the same thing running on my desk... | Stanley Lio | 08/07/07 20:44 |
| really ? | Erik Malund | 08/13/07 11:41 |
| Sadly, it's a trade name | Richard Erlacher | 08/13/07 12:58 |
yea, but...  | Stanley Lio | 08/14/07 16:31 |
| again, replacing one uncertainty with another | Erik Malund | 08/15/07 07:06 |
| I see two points | Kai Klaas | 08/07/07 22:49 |
| When you\'re ready to give up ... try this! | Richard Erlacher | 08/07/07 13:19 |
| wow | Jan Waclawek | 08/07/07 14:10 |
| use the unbuffered parts | Andy Peters | 08/07/07 14:20 |
| It works fine with S, LS, HC, AC, HCT, ACT, etc | Richard Erlacher | 08/08/07 07:28 |
| It's not so foolproof | Kai Klaas | 08/08/07 09:24 |
| I've had pretty good results ... | Richard Erlacher | 08/09/07 01:02 |
| Many thanks, I'll try some of your tips... | Rubem Pechansky | 08/09/07 06:23 |
| Maybe your AT89C2051 is just damaged? | Kai Klaas | 08/09/07 09:14 |
| Overtone | Darek Rogowski | 08/14/07 07:59 |
| 89S51/52 are much more stable | Rubem Pechansky | 08/21/07 17:38 |
| Can you still (re-) program it | Grant Beattie | 08/16/07 10:37 |
| Let's hope that Rubem will come back ... | Kai Klaas | 08/16/07 22:03 |
| Hi again, sorry | Rubem Pechansky | 08/21/07 16:23 |
| Even with no breadboard | Rubem Pechansky | 09/07/07 18:25 |
| What has the programmer to do with the oscillator? | Richard Erlacher | 09/07/07 22:29 |
| The chip is fine | Rubem Pechansky | 08/21/07 17:36 |
| What will that tell you about the oscillator? | Richard Erlacher | 09/07/07 22:40 |
| It is time to tell the manufacturer, that... | Kai Klaas | 09/08/07 07:42 |
| oscillator of 2051? | Jan Waclawek | 09/08/07 08:48 |
| Sorry, maybe I was too harsh | Kai Klaas | 09/08/07 09:02 |
| The MCU and crystals are all working for sure | Rubem Pechansky | 09/08/07 12:29 |
| It was not the 7805 | Rubem Pechansky | 09/08/07 12:35 |
| because you shook/dropped/kicked it | Erik Malund | 09/10/07 07:01 |
| 7805 decoupling | Jan Waclawek | 09/08/07 13:33 |
| LM79XX need a different treatment! | Kai Klaas | 09/09/07 17:38 |
| Good news | Rubem Pechansky | 09/08/07 14:47 |
| Is this >good news< ?? | Kai Klaas | 09/09/07 17:14 |
| Have you considered the "breadboard" effect? | Richard Erlacher | 09/09/07 17:59 |
| Inductance | David Smith | 09/10/07 04:17 |
| Hey! | Jan Waclawek | 09/10/07 04:24 |
| So what? | Kai Klaas | 09/10/07 09:01 |
| specifically | Erik Malund | 09/10/07 09:11 |
| Let\'s not go overboard ... | Richard Erlacher | 09/10/07 11:05 |
| This does not make him learn to swim... | Kai Klaas | 09/10/07 21:13 |
| I have only my own experience ... | Richard Erlacher | 09/11/07 11:22 |
| Not Atmel problem | James Krushlucki | 09/10/07 23:19 |
| things change | Erik Malund | 09/11/07 06:24 |
| looking at the wrong characteristic | Richard Erlacher | 09/11/07 11:31 |
| OT: to Richard | Jon Ledbetter | 09/11/07 11:54 |
| OT: I hadn\'t but I have ... Yes, I\'m interested! | Richard Erlacher | 09/11/07 18:29 |
| You are probably right | Rubem Pechansky | 09/12/07 20:35 |
| do you have a 10-100nF directly across the | Erik Malund | 09/10/07 06:46 |
| *** PCB and schematic *** | Rubem Pechansky | 09/12/07 21:16 |
| I cannot find C1 | Kai Klaas | 09/12/07 21:28 |
| Ahh, it is the supercap! Needs some changes! | Kai Klaas | 09/12/07 22:07 |
| Surprisingly It works like it is | Rubem Pechansky | 09/13/07 11:01 |
No, no... | Kai Klaas | 09/13/07 21:49 |
| I can't really 'read' your PCB but ... | Erik Malund | 09/13/07 06:02 |
| It is connected | Rubem Pechansky | 09/13/07 11:04 |
| Is any old recipe. | Darek Rogowski | 08/21/07 05:12 |