Digest for sci.electronics.repair@googlegroups.com - 13 updates in 4 topics

N_Cook <diverse@tcp.co.uk>: Mar 01 08:45AM

On 28/02/2018 21:02, Gareth Magennis wrote:
 
> I have no idea what that is all about.
 
> Gareth.
 
Universal self-selecting SMPS , with fuses supplied for 110V countries?
Phil Allison <pallison49@gmail.com>: Mar 01 11:29PM -0800

Nutcase Kook wrote:
 
-------------------
 
Gareth Magennis wrote:
 
 
> Universal self-selecting SMPS , with fuses supplied for 110V countries?
 
** IME, fuse current ratings for 120VAC use are exactly double what one needs for 240VAC use. See that a lot.
 
The problem is "inrush surge" which nearly every common appliance exhibits.
 
About the only types of appliance that have no switch on surge are resistance heaters for food, water and air - plus the common soldering tool.
 
FYI:
 
peak and RMS current values measured for some 240VAC items.
 
4A > .25A 60W incandescent lamp
 
12A > 7A 700W microwave
 
20A > .1A 15W CFL
 
52A > .55A colour CRT monitor
 
55A > 1.6A 1980s 100W Marshall
 
 
 
 
 
.... Phil
"J.B. Wood" <arl_123234@hotmail.com>: Mar 01 06:50AM -0500


> And there were universals sold at the stores shaped the same and didn't come with an RCA TV. Should be the same TV codes no ?
 
> Anyone remember how to work these beasts ?
 
> We can get up to change sources and adjust the picture but the keys on the set are dirty and being the resistive ladder type you press a button and it does pretty much what it damn well pleases.
 
Hello, and if you don't know the 3-4 digit code applicable to your
Toshiba, most universal remotes (perhaps your DIRECTV one) have a search
mode. The usual procedure is to power on the device to be controlled
and then use the remote to step through its stored codes until your
device powers off. However, this can be very time consuming. I have a
Comcast/Xfinity remote that I use both for the cable box and TV. This
device was designed to control multiple devices and there was a list of
device codes enclosed with the user manual. The user instructions -
that documentation no one reads and often throws out ;-). Sincerely,
 
--
J. B. Wood e-mail: arl_123234@hotmail.com
"Gareth Magennis" <soundserviceleeds@outlook.com>: Mar 01 07:18PM

wrote in message news:bpif9dhve83c75av5tcsmeac2jvn74k4ok@4ax.com...
 
I have an electric guitar. It has a 4 position switch that selects which
of the three pickups, or all of them. There is a piece of metal that
sticks up, which is supposed to have a knob on it. Knob was missing.
Besides appearance, that metal shaft is sharp and dont feel good on the
hand.
 
But this is not your typical round shaft, it's a flat piece of metal
about 1/4" wide and 1/32 inch thick. So the knob will have a slit in it.
The guitar is a Silvertone from probably the 1970s, so I wont likely
find an original knob. But I am not all that picky about getting an
original, as long as I can get something that fits.
 
I did call a music store and was told that they will check what they
have, but said he doubts they have anything. (Will call me back). So it
looks like I am gonna have to fidn something at an electronics store or
ebay. My question is *What do you call this sort of knob*? I dont know
what words to search for.
 
 
 
*************************************
 
 
Go to a guitar parts site such as this one.
 
https://www.wdmusic.co.uk/hardware-parts-c1/knobs-c39
 
 
 
 
 
Gareth.
Jon Elson <jmelson@wustl.edu>: Mar 01 03:00PM -0600

> looks like I am gonna have to fidn something at an electronics store or
> ebay. My question is *What do you call this sort of knob*? I dont know
> what words to search for.
take a 1/4" shaft and hacksaw through it so it forms two D-shaped pieces.
Hold the D's against the switch shaft and slip a standard knob onto the 3-
piece set. Then, tighten the screw on the knob to hold it together.
 
Jon
"Gareth Magennis" <soundserviceleeds@outlook.com>: Mar 01 10:20PM

"Mike Coon" wrote in message
news:MPG.3501ee19df7de682989698@news.plus.net...
 
In article <bpif9dhve83c75av5tcsmeac2jvn74k4ok@4ax.com>,
oldschool@tubes.com says...
> looks like I am gonna have to fidn something at an electronics store or
> ebay. My question is *What do you call this sort of knob*? I dont know
> what words to search for.
 
It's a motivation to read the poem "Today we have naming of parts",
which will not help at all.
 
Then get a short bit of 1/4 inch nylon or similar rod, cut it down the
middle, stick the two halves onto your sharp shaft and fit a standard
knob.
 
Mike.
 
 
 
 
*******************************
 
 
This is not a rotary switch.
 
 
Gareth.
John-Del <ohger1s@gmail.com>: Mar 01 02:55PM -0800

On Thursday, March 1, 2018 at 4:56:39 AM UTC-5, olds...@tubes.com wrote:
 
My question is *What do you call this sort of knob*?
 
 
It's called a knob...
 
Probably a knob from a Strat or Tele will fit. Bring the guitar to the music store; I'm sure they have a box o' knobs you can rifle through.
 
The best news is that if they're old knobs, they're not made in China...
Terry Schwartz <tschw10117@aol.com>: Mar 01 03:26PM -0800

Google "guitar pickup knob" and you will see a plethora of knobs that will fit your application.
 
Oh wait...... google...... never mind.
Mike Coon <gravity@mjcoon.plus.com>: Mar 01 11:44PM

In article <J0%lC.12416$LD5.4439@fx07.am4>,
soundserviceleeds@outlook.com says...
 
> This is not a rotary switch.
 
> Gareth.
 
Fortunately I cannot see whatever you are waving about ;-)
 
(I have just been watching a TV programme about Harvey Weinstein.)
 
Mike.
"Gareth Magennis" <soundserviceleeds@outlook.com>: Mar 02 12:58AM

wrote in message news:bpif9dhve83c75av5tcsmeac2jvn74k4ok@4ax.com...
 
 
 
But this is not your typical round shaft, it's a flat piece of metal
about 1/4" wide and 1/32 inch thick. So the knob will have a slit in it.
 
 
 
**************************
 
 
 
Hmmm. and thereby lies the problem with your oldendays measurement system.
 
You can't get closer than "about" 1/4 inch in a single sentence.
 
 
 
You need a pair of cheap mm callipers.
 
 
 
 
Gareth
Phil Allison <pallison49@gmail.com>: Mar 01 05:53PM -0800

olds...@tubes.com wrote:
 
---------------------------
 
> The guitar is a Silvertone from probably the 1970s, so I wont likely
> find an original knob. But I am not all that picky about getting an
> original, as long as I can get something that fits.
 
** Guitars are often fitted with multi-way LEVER switches, like the one you describe.
 
https://www.aliexpress.com/item/Yibuy-White-Switch-Knob-5-way-Pickup-Lever-Switch-for-Electric-Guitar/32752649710.html
 
May have 3,4 or 5 ways depending on the number of PUs while some use 2-way toggles - often with a centre, double ON position that caters for 2 PUs.
Lever types are quicker for the player to use than a rotary switch and the position easily identified by finger tips alone.
 
The push-fit knob is similar to ones used with slider controls, particularly those fitted closely spaced on graphic equalisers.
 
Making a small, grub screw knob secure by packing the gaps as another suggests sounds good if you don't mind putting in the time.
 
 
IME, repairing broken & bent shaft pots on guitar amps is part of a great many jobs. Sometimes 1980s Marshalls turn up with the whole lot visibly damaged.
 
Then there are the 2000 series where the flimsy plastic pots look OK but work intermittently.....
 
 
 
.... Phil
"Dave M" <dgminala@mediacombb.net>: Mar 01 09:50PM -0600

Take a look at the knobs on eBay (item number:162919395802). Probably the
ones you are looking for. I see that this listing only has 3 available. If
you only need one, then you should be good to go.
 
Cheers,
Dave M
(I'm from the old school too)
 
 
 
bleachbot <bleachbot@httrack.com>: Mar 02 02:53AM +0100

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