Speaker - terminal connected to the AC line?
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From: William R. Walsh on 26 May 2010 09:51 Hi! > That gives me an idea for testing subwoofers ... > Connect each speaker terminal to the active and neutral of a > mains supply. Now come on, haven't you watched enough Youtube to know what happens when you do that? ;-) Interestingly, the very idea of connecting a speaker to the AC line is mentioned early on in my copy of the ARRL's "Now You're Talking" book. They tell you not to do so, and I suppose that there are some people out there who need to be told that...more so because they'd hurt or kill themselves in the process. William
From: William R. Walsh on 26 May 2010 10:04 Hi! > The CD player worked just fine (still does), and the amp worked > OK, but had a noisy cooling fan. I put a much quieter > fan in it, and redesigned the air cooling flow, and modified the > circuitry to give it proportional control of the fan. Works great.... I have thought about doing something like that with this unit, as it does get hot. I don't know if the circuit used is the "new class A" or not. The receiver itself makes no mention of this feature, so I'd guess not. There's not much room to add anything, at least not at a point where I feel it would be close enough to help cool the power supply as well. The last thing I would want to do is add a hum or other annoying problem by way of design "improvements". On the other hand, it has lasted over 20 years just the way it is. I just don't like it when stuff runs that hot. > I find it depressing to see the stuff that gets tossed out. As do I. Most recently I had to work hard to force myself not to pick up a microwave oven. I didn't want or need it as a microwave--instead I was hoping to harvest magnets, motors, control board and maybe the case metal. Very little goes to waste around here. > Around here (Nova Scotia) you can't throw electronics stuff out, > it has to go to a special recycler. Now you can't get your hands > on old electronic throw-aways, the recycler refuses to let anyone > have any of the stuff so you can repair it (and do the ultimate > recycling where you bring it back to life). I think they're afraid of liability or something along those lines. I used to know a few recyclers, including one who would let me wander all over the place, pick out what I wanted and pay him some small price for it. Most of the others were at least somewhat receptive to my rambling around when I told them that I knew to be careful and that anything I took home with me was my problem--and the last that they would hear of it. Most of what I picked up was computer equipment, and the education I received was worth far more than the price I paid. The same with junkyards...although I did not take anything home from there because I certainly didn't have the space or time. I spent a lot of time walking through those, looking at the things people had (for whatever reason) cast away as junk. At least some of those cars would have needed nothing more than a battery and some cleaning to be fine once again. Heh...try doing that now. Most junkyards won't let you anywhere nearby and the "old country junkyard" is a thing of the past for the most part, taken away by tightening environmental regulations. > I have had electronic equipment that I've tried to preserve and > gone to extraordinary lengths to keep them running, even > though I KNOW it's not worth the effort. It's like you want to cheat > the grim reaper of electronics. Exactly. (Of course, there are also the devices that just seem to run and run forever, with little to no maintenance whatsoever.) > You kinda wish someone would do the same for you.. Longevity does run in my family, so I might do alright there. The most ready example is that of my grandfather, who at 96 does exactly as he pleases. William
From: David Nebenzahl on 26 May 2010 15:18 On 5/25/2010 8:29 PM Paul G. spake thus: > On Tue, 25 May 2010 18:49:19 -0700, David Nebenzahl > <nobody(a)but.us.chickens> wrote: > >> On 5/25/2010 4:39 PM Paul G. spake thus: >> >>> That's funny.... when I was visiting my daughter in Ottawa, I >>> spotted a bunch of stereo stuff piled up for garbage pickup. I grabbed >>> a Techics (!) "new class A" amp, and a Technics CD player, and >>> stuffed them in the trunk of the car for the 1200 mile return trip. >> >> Hey, my current amp is one a'them Technics "new class A"s, a >> SU-V6X. What's yours? Got mine really cheap years ago at a >> Starvation Army store. > > Mine's a SU-V7B. I imagine there's not a lot of difference... I used > the schematics for SU-V98 to change some of the circuitry. That was > the only close schematic I could find on the internet. It wasn't quite > the same, but the reference designators (like R520, C123) were good > enough to locate things. > The original fan was irritatingly loud... I can't imagine how > anyone could put up with it. Fan? What fan? Mine has no fan. Yours must be a higher-powered unit than mine. -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com)
From: David Nebenzahl on 26 May 2010 15:22 On 5/26/2010 6:51 AM William R. Walsh spake thus: > [Franc Zabkar wrote:] > >> That gives me an idea for testing subwoofers ... > >> Connect each speaker terminal to the active and neutral of a >> mains supply. > > Now come on, haven't you watched enough Youtube to know what happens > when you do that? ;-) I see nothing gets by you, William. Now think about *why* Franc made this particular little joke. Ah, now you're getting it. -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com)
From: Baron on 26 May 2010 16:45
William R. Walsh Inscribed thus: > Hi! > >> That gives me an idea for testing subwoofers ... > >> Connect each speaker terminal to the active and neutral of a >> mains supply. > > Now come on, haven't you watched enough Youtube to know what happens > when you do that? ;-) > > Interestingly, the very idea of connecting a speaker to the AC line is > mentioned early on in my copy of the ARRL's "Now You're Talking" book. > They tell you not to do so, and I suppose that there are some people > out there who need to be told that...more so because they'd hurt or > kill themselves in the process. > > William Many years ago I used a 6.3v heater transformer and a loudspeaker as a door opening alarm. 50Hz certainly got your attention... -- Best Regards: Baron. |