- HITACHI V-353F OSCILLOSCOPE V-353-F - 7 Updates
- Use of non-screened transformer in old monitor - 1 Update
| jurb6006@gmail.com: Mar 18 06:46PM -0700 On Sunday, March 18, 2018 at 9:44:03 AM UTC-5, Terry Schwartz wrote: > I love when someone declares himself an "expert". > I've been in this field 40+ years and I learn something every day I work on electronics. > I hope I am never so pompous as to consider myself an "expert". You probably are an expert. There is nothing that says that experts do not continue to learn, in fact, quite the contrary. No need for excessive humility, you got bona fides then let it be known. I have done things that would blow most peoples' minds, want a listing of some of them ? You probably have as well, that might make a good thread actually, the unusual. |
| jurb6006@gmail.com: Mar 18 06:49PM -0700 >"However, the vertical would "thicken" in response to the cell phone transmitting it it was close enough to the scope" Next question; does the amount of thickening (amplitude) change with the setting of the volts/div ? |
| tabbypurr@gmail.com: Mar 18 07:30PM -0700 > They have no idea what your friendship is worth to you. > They have no idea what new knowledge and techniques are worth to you. > And, analog scopes are "the bomb" in contemporary vernacular. As you teach with one you slow down the sweep so they can actually see the trace move as you connect a battery, or a speaker output from an amp. I think the study of analog scopes should be mandatory in schools at least in the beginning when they learn the basics. If you can rig up simultaneous voltage and current sensing you can demonstrate reactance, power factor and all kinds of shit in real time. You can make them understand for real rather than just able to do the math. The young need this knowledge for all that is to come, and there is no better way to instill it. I will try to save almost any DC capable scope that has triggered sweep and a decent graticule. 30 years ago I was offered a 1940s scope for £4. I said that was far too much. ISTR they had 2 line speeds, nothing more than a pot to select vertical sensitivity, no graticule & plenty of distortion on a 2 or 3" round CRT etc. As basic as it gets. NT |
| bruce2bowser@gmail.com: Mar 19 01:28AM -0700 > Couldn't find a print on it. > What do you mean died ? Did the trace stop moving or did it disappear ? If it disappeared the first thing to look at it the voltage on the deflection plates. If they are equal look to the blanking circuit. > This is not going to be easy without service information. You have to wonder what would happen to it if a bunch of water from the second floor dripped down on it. |
| Terry Schwartz <tschw10117@aol.com>: Mar 19 05:57AM -0700 That seems unlikely, since they are "down under". Everything is backwards there -- water drips UP from the basement to the upper floors. |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Mar 19 06:54AM -0700 On Monday, March 19, 2018 at 8:57:35 AM UTC-4, Terry Schwartz wrote: > That seems unlikely, since they are "down under". Everything is backwards there -- water drips UP from the basement to the upper floors. > > You have to wonder what would happen to it if a bunch of water from the second floor dripped down on it. There is that! But, one of the nice things about doing "this" as a hobby, is that I have plausible deniability when it comes to expertise. But, over the last 45+/- years, some stuff has stuck. I have started a new job in a hospital/med-school setting. One of the researchers develops and makes artificial hearts - we had a long discussion on bearings the other day. Peter Wieck Melrose Park, PA |
| Terry Schwartz <tschw10117@aol.com>: Mar 19 07:11AM -0700 > I have started a new job in a hospital/med-school setting. One of the researchers develops and makes artificial hearts - we had a long discussion on bearings the other day. > Peter Wieck > Melrose Park, PA Peter, if I ever need an artificial heart, please let the researcher know I want mine with good old Merican bearings. The Chinese bearings are of notoriously poor quality. |
| jurb6006@gmail.com: Mar 18 06:51PM -0700 On Sunday, March 18, 2018 at 11:42:22 AM UTC-5, Jon wrote: > It is now fine with a toroidal transformer. > It looks like the electrostatic screening of the original was less important than the magnetic screening. > Jon So case closed. Literally :-) if ya know whaddImean... |
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