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475 questions
Hi Albert, Yup, 2.22 is ~ pi/√ 2! And I did not know that, but I thought the consistancy of the ratios between those measurements on each rail might indicate something to somebody, and you were the on
Hi Albert, Yup, 2.22 is ~ pi/√ 2! And I did not know that, but I thought the consistancy of the ratios between those measurements on each rail might indicate something to somebody, and you were the on
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ciclista41@...
· #167451
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475 questions
Hi Reed, Yes, and it turns out you were right about that. I didn't do it, for the reasons that I had already decided to pull out all the large caps and replace them, plus I didn't see your suggestion
Hi Reed, Yes, and it turns out you were right about that. I didn't do it, for the reasons that I had already decided to pull out all the large caps and replace them, plus I didn't see your suggestion
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ciclista41@...
· #167448
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475 questions
Graham, I forgot to mention that I WILL be investing in a higher end DMM. While the GME-236, a recent acquisition, is quite handy for quick checks of ESR of in-circuit caps to find questionable or bad
Graham, I forgot to mention that I WILL be investing in a higher end DMM. While the GME-236, a recent acquisition, is quite handy for quick checks of ESR of in-circuit caps to find questionable or bad
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ciclista41@...
· #167447
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475 questions
Thank you, Graham! If you read the post I just made a few moments ago, you know you called the bad caps ahead of time! I just need to check the associated rectifiers. I don't think I should be turning
Thank you, Graham! If you read the post I just made a few moments ago, you know you called the bad caps ahead of time! I just need to check the associated rectifiers. I don't think I should be turning
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ciclista41@...
· #167446
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475 questions
Hi All! I've been working on the scope and digesting information. I am posting this update before going through the posts that have been contributed since I last posted. Everyone has been really helpf
Hi All! I've been working on the scope and digesting information. I am posting this update before going through the posts that have been contributed since I last posted. Everyone has been really helpf
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ciclista41@...
· #167445
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475 questions
Michael, Yes, I'll be digging deeper with the suggested references. I will download the 465 manual. I think it may be time to get a hard copy of the manual for this thing. I can blow the diagrams up o
Michael, Yes, I'll be digging deeper with the suggested references. I will download the 465 manual. I think it may be time to get a hard copy of the manual for this thing. I can blow the diagrams up o
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ciclista41@...
· #167382
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475 questions
Graham, Yeah, those readings made no sense to me, and when the AC was consistently between 2.2 and 2.3 times the DC, I figured something wasn't kosher. I've got an old Radio Shack Micronta 22-291U, It
Graham, Yeah, those readings made no sense to me, and when the AC was consistently between 2.2 and 2.3 times the DC, I figured something wasn't kosher. I've got an old Radio Shack Micronta 22-291U, It
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By
ciclista41@...
· #167381
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475 questions
Harvey, I have used your offline composition method before. I just got lazy. Have been composing offline for any lengthy posts since losing that one. Yes! I like plumbing analogies, as I have (too muc
Harvey, I have used your offline composition method before. I just got lazy. Have been composing offline for any lengthy posts since losing that one. Yes! I like plumbing analogies, as I have (too muc
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By
ciclista41@...
· #167379
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475 questions
Albert, R1478 which should be 3.6 ohms measures 3.2 on analog, 3.6 on digital. R1468 which should be 0.6 ohms measures 0.7 on analog, 0.7 on digital. So not far off. I do trust my analog more because
Albert, R1478 which should be 3.6 ohms measures 3.2 on analog, 3.6 on digital. R1468 which should be 0.6 ohms measures 0.7 on analog, 0.7 on digital. So not far off. I do trust my analog more because
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By
ciclista41@...
· #167375
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475 questions
Very interesting, Albert. I do have a variable switching power supply that will put out either constant voltage or constant amperage with 0-30V and 0-10A. I'll have to try that! Bruce
Very interesting, Albert. I do have a variable switching power supply that will put out either constant voltage or constant amperage with 0-30V and 0-10A. I'll have to try that! Bruce
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ciclista41@...
· #167374
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475 questions
Hi again, Dave. Here are the readings I just took across the test points: DCV, then ACV 110 = 87 225 50 = 37.5 90 15 = 12 22.5 5 = 3.5 4.2 -15 = -14.2 32.5 -8 = -5.7 18.5 UNREG 50 = 40 102.5 105 = 7.5
Hi again, Dave. Here are the readings I just took across the test points: DCV, then ACV 110 = 87 225 50 = 37.5 90 15 = 12 22.5 5 = 3.5 4.2 -15 = -14.2 32.5 -8 = -5.7 18.5 UNREG 50 = 40 102.5 105 = 7.5
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By
ciclista41@...
· #167373
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475 questions
Hi Graham! Thanks for your contributions and supportive words! Yes, what I have learned has mostly been internet sourced, including the book available at allaboutcircuits.com, but I am only at Chapter
Hi Graham! Thanks for your contributions and supportive words! Yes, what I have learned has mostly been internet sourced, including the book available at allaboutcircuits.com, but I am only at Chapter
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ciclista41@...
· #167372
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475 questions
Hi Albert, Are "low-homic" current sensing resistors different from any other resistor of the same rating? I checked my vast supply of components and found four 47K ohm resistors. By the way, that is
Hi Albert, Are "low-homic" current sensing resistors different from any other resistor of the same rating? I checked my vast supply of components and found four 47K ohm resistors. By the way, that is
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By
ciclista41@...
· #167365
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475 questions
Hi Michael! Reading back through the thread just now, I realized that I never replied to your helpful post. So sorry! Just because I'm retired, doesn't mean I don't get interrupted occasionally. I hav
Hi Michael! Reading back through the thread just now, I realized that I never replied to your helpful post. So sorry! Just because I'm retired, doesn't mean I don't get interrupted occasionally. I hav
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By
ciclista41@...
· #167335
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475 questions
Hi John! That's a great story and endorsement of this forum and its denizens! I certainly don't have the sentimental value to my 475 that you have to yours. So sorry for your loss--my folks are gone,
Hi John! That's a great story and endorsement of this forum and its denizens! I certainly don't have the sentimental value to my 475 that you have to yours. So sorry for your loss--my folks are gone,
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By
ciclista41@...
· #167334
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475 questions
Thanks, Dave! I'm surprised that I would find AC voltage at the rectifier filter caps. I thought those came after the rectifier in the circuit, so any AC would be gone by that point. And if the rectif
Thanks, Dave! I'm surprised that I would find AC voltage at the rectifier filter caps. I thought those came after the rectifier in the circuit, so any AC would be gone by that point. And if the rectif
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By
ciclista41@...
· #167333
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475 questions
Hi Harvey, So frustrating! I had a reply nearly as long as your post above, but accidentally hit some button and the entire thing evaporated. Oh well, maybe I will be less wordy and more to the point
Hi Harvey, So frustrating! I had a reply nearly as long as your post above, but accidentally hit some button and the entire thing evaporated. Oh well, maybe I will be less wordy and more to the point
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ciclista41@...
· #167332
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475 questions
Hi Barry! I appreciate the positive words! I don't quite have that level of confidence, but since those who have gone before me in similar efforts have been successful, I guess it's not out of the rea
Hi Barry! I appreciate the positive words! I don't quite have that level of confidence, but since those who have gone before me in similar efforts have been successful, I guess it's not out of the rea
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ciclista41@...
· #167310
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475 questions
Hi Ernesto! Thanks for the excellent advice! I have been looking at new and used variacs with that in mind. However, after I built the incandescent bulb current limiter this morning, I felt that I cou
Hi Ernesto! Thanks for the excellent advice! I have been looking at new and used variacs with that in mind. However, after I built the incandescent bulb current limiter this morning, I felt that I cou
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By
ciclista41@...
· #167309
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475 questions
Hi Albert, Yes, I re-read them just after turning the scope off, before my last reply, and I re-read them just now. All three are shorted regardless of the polarity with which I measured them. So it's
Hi Albert, Yes, I re-read them just after turning the scope off, before my last reply, and I re-read them just now. All three are shorted regardless of the polarity with which I measured them. So it's
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By
ciclista41@...
· #167304
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