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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Fri 01, 2019 11:54 pm 
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Location: Annapolis, MD
Nomenclature:
"Polarized" typically means that polarity matters---but the term is not applied to everything where that is true. For example, I've never heard reference to a "polarized" vacuum tube.

An electrolytic capacitor depends on a polarity-sensitive electrochemical process to create the dielectric. It is referred to as "polarized" since it will only work correctly with one polarity of applied voltage.

Pretty much all other passive components are non=polarized, meaning that polarity does NOT matter. In general, the use of a non-polarized part is always acceptable. Specifically for capacitors, the only real downside is that--for a filtering application where electrolytics are often found, use of a regular capacitor will have a size and/or cost penalty.

And then there are "non-polarized electrolytics". One way to do this is to have 2 regular electrolytics back to back---such that each one sees an equal but opposite voltage. There is a way of doing this in the basic construction, but I'm not smart about the details.

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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Sat 02, 2019 1:20 am 
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Joined: Jan Mon 05, 2015 6:38 pm
Posts: 101
Location: Wasilla Alaska
It makes sense to stick to the schematics and not fall off the path.

Thanks

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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Sun 03, 2019 12:12 pm 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 10921
Location: Powell River BC Canada
I think the Radio Amateurs Handbook is a tutorial for those who have proved they
know enough about electronics and communications to be granted a license
after they have passed the exam.

I (and I suspect) many others were doing radio stuff with enough success
to realize it was an avocation, years before any formal training.

And years later, back to learn to teach formally, I found out how to
un teach some self-taught stuff , for safety reasons, in some cases.

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Amateur Radio Literacy Club. May we help you read better.
Steve Dow
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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Sun 03, 2019 4:18 pm 
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Joined: Jan Mon 05, 2015 6:38 pm
Posts: 101
Location: Wasilla Alaska
radiotechnician wrote:
I think the Radio Amateurs Handbook is a tutorial for those who have proved they
know enough about electronics and communications to be granted a license
after they have passed the exam.

I (and I suspect) many others were doing radio stuff with enough success
to realize it was an avocation, years before any formal training.

And years later, back to learn to teach formally, I found out how to
un teach some self-taught stuff , for safety reasons, in some cases.


I remember the radio or communications from the 1960's when I was a child, seems everyone was into that hobby. I never had anyone teach me anything, my father, grandfather, abandoned me, I'm self taught on everything since I was young.

Right or wrong, I had to learn how to fix things, without the guidance of someone it was really difficult to get things done. Over the decades, I've learned (matured) to read books on the subject I'm working on and not just go into it without being prepared.

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I'm like one of those mad scientist's recreating life in a dead radio.
Another Young Frankenstein!


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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Fri 08, 2019 5:31 am 
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Joined: Jan Mon 05, 2015 6:38 pm
Posts: 101
Location: Wasilla Alaska
Tonight, I got the radio up and running. Still more work to be done, one step at a time.

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I'm like one of those mad scientist's recreating life in a dead radio.
Another Young Frankenstein!


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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Fri 08, 2019 7:28 am 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 10921
Location: Powell River BC Canada
That is good news. Is there some cabinet work to be done ?

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de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Fri 08, 2019 3:40 pm 
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Joined: Jan Mon 05, 2015 6:38 pm
Posts: 101
Location: Wasilla Alaska
radiotechnician wrote:
That is good news. Is there some cabinet work to be done ?



I've got the cabinet 90% refinished. I'm looking for the brass ring that is pressed into the back door, where you pull it open.

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I'm like one of those mad scientist's recreating life in a dead radio.
Another Young Frankenstein!


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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Sat 09, 2019 3:33 am 
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Joined: Jan Mon 05, 2015 6:38 pm
Posts: 101
Location: Wasilla Alaska
:o I've found a disc capacitor hidden under a det. coil, .001 22-4 on it. All of the other disc is 22-3 inside of the chassis. Is this one specific, or can a 22-3 work in it's place????

If not I will have to order them. :twisted:

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I'm like one of those mad scientist's recreating life in a dead radio.
Another Young Frankenstein!


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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Sat 09, 2019 5:25 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12356
Location: Mpls, Minnesota
The 22-3 is .01 mfd the 22-4 is .004 mfd they are not interchangeable.

Dave


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 Post subject: Re: Old Capacitors, resistors, question about holding voltag
PostPosted: Feb Sat 09, 2019 6:19 am 
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Joined: Jan Mon 05, 2015 6:38 pm
Posts: 101
Location: Wasilla Alaska
https://sites.google.com/site/5g40chassiscomplete/

I have some photos of the chassis.

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I'm like one of those mad scientist's recreating life in a dead radio.
Another Young Frankenstein!


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