Digest for sci.electronics.repair@googlegroups.com - 8 updates in 4 topics

jurb6006@gmail.com: Aug 11 07:59PM -0700

>'Just twiddle with the knobs and sliders until it sounds good. What
else does one need to know? "
 
Much. One sort of rule of thumb is to take FM hiss, turn off the muting and see which controls have the most effect. The ones with less effect should be boosting and the ones with more effect should be cutting. But that is a very rudimentary primer on it. People used to bring their cars to me to have me set the EQ, back when you could. Houses to, in factr I modified an EQ for a friend of mine because it was only a 5 band and he needed slightly different frequencies. I turned the 60 Hz control into about a 40, the 250 into a 150, left the 1,000 alone and the 3,500 but extended the 15 KHz to infinity by removing the inductor. Also the new 40 Hz control's range extended to subsonic. I used resistance and whatever to get the range where I wanted it with the same inductor, but the cap I took to about 10 X its original value.
 
I actually heard that system and knew what it needed.
 
I am a \n expert on frequency response and tone controls. I designed a non-phase-shit set of bass and treble that are so bad to the bone some people wouldn't even want them. The bass turnover adjustable from 48 to 440 Hz, and the treble from 3,500 Hz to about 9,000 Hz. Each has a range of +/- 16 dB.
 
These controls are to be used judiciously, you can't just say "I like bass, crank the bass all the way", you'll fry either your amp or woofers. The only time you want to use the full range of boost or cut is as a crossover for a subsat system. Even then, I have a no phase shift variable crossover. Much better for the task.
 
But now with my ears I must really boost certain ranges, to the point where some people do not want to listen with me. But that's OK, been a loner for major parts of my life. Many people will not eat my food. I am a spice, garlic and HOT freak. The very few who eat mt cooking are very happy, but many people just can't stand the strength of my spices. It is the same with the stereo, it is tailored to ME.
 
You know this mic in the car shit is just a ruse. Like a Rube Golberg design. It will set the sound flat, but wait, they have the same data from the other 999,999 of those cars they sold. So bottom line it is a gimmick/
tabbypurr@gmail.com: Aug 12 12:34AM -0700


> >'Just twiddle with the knobs and sliders until it sounds good. What
> else does one need to know? "
 
> Much. One sort of rule of thumb is to take FM hiss, turn off the muting and see which controls have the most effect. The ones with less effect should be boosting and the ones with more effect should be cutting. But that is a very rudimentary primer on it. People used to bring their cars to me to have me set the EQ, back when you could. Houses to, in factr I modified an EQ for a friend of mine because it was only a 5 band and he needed slightly different frequencies. I turned the 60 Hz control into about a 40, the 250 into a 150, left the 1,000 alone and the 3,500 but extended the 15 KHz to infinity by removing the inductor. Also the new 40 Hz control's range extended to subsonic. I used resistance and whatever to get the range where I wanted it with the same inductor, but the cap I took to about 10 X its original value.
 
5 band graphic eqs were crap, but the worst thing about them was that they wasted one of the sliders on a 1kHz band.
 
 
 
> You know this mic in the car shit is just a ruse. Like a Rube Golberg design. It will set the sound flat, but wait, they have the same data from the other 999,999 of those cars they sold. So bottom line it is a gimmick/
 
Speakers vary though.
 
 
NT
Cursitor Doom <curd@notformail.com>: Aug 12 03:20PM

On Sun, 12 Aug 2018 00:34:54 -0700, tabbypurr wrote:
 
>> same inductor, but the cap I took to about 10 X its original value.
 
> 5 band graphic eqs were crap, but the worst thing about them was that
> they wasted one of the sliders on a 1kHz band.
 
just wondering how taking an GE to someone else to set-up is going to
help me when I can't hear fuck all above 12kHz!
 
 
 
 
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Mike S <mscir@yahoo.com>: Aug 12 01:44AM -0700

Where would I look for a schematic for a Nokta AU Gold Finder Metal
Detector? The owner says it makes a constant siren/beeping sound when
turned on, wasn't dropped or exposed to water. I told him to look for
bad caps while I tried to find a schematic, but so far no joy.
skyusbook <skyusbook3@gmail.com>: Aug 11 08:28PM -0700

[ Ron Larson, Bruce H. Edwards ] Calculus: Early Transcendental Functions (MindTap) 6th Edition Cengage Learning;(2014) Instructor Solutions Manual ISBN-13: 978-1285774770
 
 
 
The solutions manuals to huge list of educational books are ready for use. They all have full and precise solutions. Both instructors and students can use these solutions manuals.
To get the solutions manual you need, feel free to send an email with the title.
 
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Ancel B <protofabtt@gmail.com>: Aug 11 09:46AM -0700

On Tuesday, August 7, 2018 at 9:24:36 PM UTC-4, Peter Jason wrote:
> Unit with charger & owners handbook. Working.
> Best offer.
> Peter
 
Hmm..My HP 28S still works fine since the late 80's. Just don't leave batteries in it to degrade.
Fox's Mercantile <jdangus@att.net>: Aug 11 12:53PM -0500

Ya'll got me thinking.
I bought the HP 35 while I was working for TRW back around 1974.
Almost two weeks worth of pay and more than I paid for rent for
a month.
I also remember at the time, "Reverse Polish Notation? This is a
joke isn't it?"
<http://www.hpmuseum.org/two35s.jpg>
I bought it from the book store across the street from El Camino
College.
I have NO idea what ever happened to it.
I did by the HP10C when it came out.
<http://www.hpmuseum.org/10c.jpg>
I still have it, and a 12C I picked up last year in a thrift store
for $5.
<http://www.hpmuseum.org/12c.jpg>
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
John-Del <ohger1s@gmail.com>: Aug 11 04:49PM -0700

On Saturday, August 11, 2018 at 1:54:08 PM UTC-4, Fox's Mercantile wrote:
> a month.
> I also remember at the time, "Reverse Polish Notation? This is a
> joke isn't it?"
 
Back when I was entering college, a scientific calculator was a requirement, and there were several on the recommended list. I narrowed them down to the Texas Instruments SR-51A and the HP (don't remember the model).
 
I bought the SR-51A because I never owned an RPN calculator and figured one less thing for me to learn would be a good thing. The TI was great until a redistributioner relieved me of it. I then bought the HP 34C and became used to the RPN method within minutes.
 
I still would love to have another SR-51A though. Aesthetically, he SR-51A was pretty where the 34C looked so damned professional. I guess it's off to ebay...
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