- Help Thermal Fuse - 1 Update
- OT: Google dumping/lost? bits of the Deja/Usenet archive they bought ? - 2 Updates
- Capacitor Shield ? - 7 Updates
| Ivan Vegvary <ivanvegvary@gmail.com>: Nov 09 08:40AM -0800 Replacing thermal fuse in wall oven power supply. Does fuse measure temperature of ambient, or, temperature based on current through fuse? I ask because I would like to attach wire leads to fuse since I screwed up soldering directly to the board. Thank you. |
| N_Cook <diverse@tcp.co.uk>: Nov 09 01:22PM I was going to celebrate my first posting to this new-fangled internet thing, 06 November 1995 to the usenet group sci.electronics.repair, it used to be on Google as <http://groups.google.co.uk/groups?selm=47khvl%24o1i%40alpha.aladdin.co.uk&output=gplain> I used a long gone local internet cafe, before using a 300 bit modem on my tlephone line, to see what all the hype was about. Anyone know if my message is retrievable anwhere/anyhow? I can't even find a sensible search structure, eg date-limitation, to https://groups.google.com/forum/?hl=en#!forum/sci.electronics.repair I probably took an image of the message sometime since 2000 |
| N_Cook <diverse@tcp.co.uk>: Nov 09 01:34PM On 09/11/2015 13:22, N_Cook wrote: > I can't even find a sensible search structure, eg date-limitation, to > https://groups.google.com/forum/?hl=en#!forum/sci.electronics.repair > I probably took an image of the message sometime since 2000 for 300 bit, read 300 baud |
| "Ron D." <Ron.Dozier@gmail.com>: Nov 08 01:47PM -0800 No real clue except an explosive shield. There is a polarity on non-polarized caps. It is suggested that the "foil side" go to the low Z point in the circuit. Typically this would be important in a vacuum tube circuit. Not all caps are marked alike, "Foil side" used to be a common marking. |
| Michael Black <et472@ncf.ca>: Nov 08 07:10PM -0500 |
| M Philbrook <jamie_ka1lpa@charter.net>: Nov 08 08:29PM -0500 In article <alpine.LNX.2.02.1511081908350.23078@darkstar.example.org>, et472@ncf.ca says... > It never really came up because by the time of transistors, the paper > capacitors had mostly faded away. > Michael or dried out :) Jamie |
| "Ron D." <Ron.Dozier@gmail.com>: Nov 08 06:29PM -0800 Mr. Black: yes. But, these https://www.tedss.com/2020024048 0.1V 600V modern caps are BIG too. There is a youtube video of a guy that made a device to help you sort out the foil side. The foil side to the Low Z point makes a lot of sense. |
| Jeff Liebermann <jeffl@cruzio.com>: Nov 08 06:32PM -0800 >https://dl.dropboxusercontent.com/u/29948706/KR-4070%20Caps.jpg >In a Kenwood receiver. It is steel, not aluminum. >What is its purpose ? Notice the blue and black pair of wires that are carefully routed around the shield. My guess(tm) is that they carry AC power from the xformer partly obscured at the top of the photo. Also note that both ends of the steel shield are at chassis ground through mounting screws. The steel shield possibly provides some reduction in 60 Hz (hummmmm) coupling to the power supply filter caps. Later revisions, that didn't have the shield probably re-routed the AC wiring. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| makolber@yahoo.com: Nov 08 06:59PM -0800 I'd agree with that. Probably there was a hum or buzz in the low level magnetic phono circuits which are very sensitive. Mark |
| Jeff Liebermann <jeffl@cruzio.com>: Nov 08 07:58PM -0800 >I'd agree with that. >Probably there was a hum or buzz in the low level magnetic phono circuits which are very sensitive. >Mark Something must be wrong. Nobody ever agrees with me. Marginally related anecdote: The easiest way to tell what something does is to remove it and see what breaks. I used to own a 1970 Land Rover Series IIa. In order to replace the spark plugs, I had to first remove a steel "heat shield". This bothered me as I could see no reason why a heat shield was necessary in such an open and drafty engine compartment, with nothing nearby to protect. So, I removed it. Everything was normal until I hit 57 mph, when the engine compartment turned into a giant low pitched whistle, which made enough noise to attract the attention of all the nearby drivers on the freeway. Apparently the "heat shield" detuned the engine compartment so that it would not whistle at operating speeds. Remove the amplifier shield and see what happens. My bet is some low level hum, that could only be measured on instruments, but which would affect the advertised noise levels. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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