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1-9 of 9 messages
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Old TV parts
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by KC9ANP on February 4, 2003
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I am very new to the homebrewing world.(I have made a couple of antennas)
My Dad threw out an old (~25 yrs old) RCA TV.
I pulled out the circut board and am wondering if the capacitors resistors and such would be a useful addition to my budding junk box before I start unsoldering everything.
Thanks in advance,
kc9anp
D. Otto
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RE: Old TV parts
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by WA4PTZ on February 5, 2003
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That used to be one of my prime parts sources, old
and discarded electronics. I scrapped many items
through the years and have amassed a great collection
of all types of electonic parts. With the exception
of special transistors , FET's and IC's I seldom order
any parts. I get them from my supply. This has saved
me thousands of dollars in the last 25 years.
73 - Tim
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RE: Old TV parts
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by KB0NLY on February 5, 2003
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Although the argument of re-using older caps and resistors may come up, i too salvage as much as i can from old electronics. One word of caution however, if the tv has been connected to power recently, and it doesn't matter if it was turned on or not only if it was plugged in, be aware that lethal voltages can exist inside for a significant amount of time after being unplugged.
I have seen a TV with voltages still present inside two days after being unplugged, ask a local TV/VCR repair shop if don't believe it can happen, they can tell you first hand what they have to watch out for in opening one up.
Other than those words of wisdom, or some might say my own opinion, save what you can!
73,
Scott, KB0NLY
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RE: Old TV parts
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by WB6BYU on February 5, 2003
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Yes!
At some point, you may have more parts on hand than you
will ever need, and it won't be worth unsoldering any
more common ones. But it is a great way to start.
There are, of course, some limits on what parts are
suitable for different projects. If you are building
tube radios, there won't be many parts on a transistor
radio board that will be useful because most won't
withstand the voltage. But that is mostly a matter of
understanding the limits of the parts.
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RE: Old TV parts
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by WA9SVD on February 5, 2003
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One safety matter (in addition to the possible voltages that might be present) is to be VERY careful of the CRT (picture tube!) If improperly handled and broken, the high vacuum inside the tube can cause an implosion that can send (glass) shrapnel in all directions.
I don't want to go into details here, but there are ways to "defuse " such time bombs. The technique I was taught is quite primitive (over 40 years ago,) and I'd like to hear from others before I comment further. They might have better or easier methods or suggestions. Or contact me by e-mail if you have further questions.
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RE: Old TV parts
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by WB2WIK on February 6, 2003
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As a kid 30+ years ago, I used to "defuse" discarded television CRTs by shooting them with a BB gun from about 100 feet away. Not such a hot idea.
Today, at least here in California, there is actually a charge to dispose of a CRT legitimately! I found one way around that is to bring them to the local computer repair shop, who disposes of lots of CRTs all the time, and they're willing to mix mine in with theirs and not charge me for it.
As for "parts," one can never have too many. But keeping track of them is another thing. Get some storage boxes with lots of little plastic pull-out drawers, and start making labels as you start filling up the drawers. I keep my parts sorted something like this:
Resistors, <1 W: 0-100 Ohms; 110-470 Ohms; 510-990 Ohms; 1K - 9.9K; 10K - 99.9K; etc.
Then, other drawers for resistors >1W but <5W; and other drawers for real power resistors >5W (those get big, and you might need bigger drawers!) -- cigar boxes, old Tupperware containers and lots of different type enclosures can satisfy the need for storage.
My "capacitor" drawers are sorted by voltage and value; inductor drawers are sorted by inductance and estimated current rating; toroid cores by material and size; transistors by P/N and physical size; ICs by type; and on and on. I must have thirty of the little cabinets which have about a dozen drawers each, completely full of parts, most of which cost nothing or nearly nothing and were accumulated over many years.
But, if you don't label things, a year or two from now you'll have no idea what you have or where anything is!
WB2WIK/6
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RE: Old TV parts
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by KT8K on February 20, 2003
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You might consider a capacity analyzer, as discrete component values can wander with age and exposure to heat. I would verify their values before including them in a project, if possible, to avoid confusing results and extra debugging later.
Hope to catch you on the air soon.
73 de kt8k - Tim
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RE: Old TV parts
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by WA9SVD on February 22, 2003
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Steve-
Where do you store your capacitators and condensers? (LOL!)
I wish I had a couple of those 60's era TV power transformers now. They would be perfect for an amp I want to build!
AH, them wuz the gud ol' daze!
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