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radio shack kit question on (other) transformer ("input" 4Kc

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Guest

Tue Sep 10, 2013 11:56 am   



A number of the radio shack science fair electronics learning kits (at least 150-1, 160-1, 200-1) and some other equivalents (at least of the 200-1) have a (second) transformer, (some) with the labels 4K on one leg of a center-tapped side and 2K on the other (not center-tapped) side. It also has the label "input transformer".

Suggestions for a (hopefully inexpensive) reasonable match/replacement for this part, that is readily purchased somewhere greatly appreciated?

Thanks.

Mark Zenier
Guest

Wed Sep 11, 2013 10:47 pm   



In article <e849f321-309a-47a1-a245-ad61292ff8f9_at_googlegroups.com>,
<learntrade_at_yahoo.com> wrote:
Quote:
A number of the radio shack science fair electronics learning kits (at
least 150-1, 160-1, 200-1) and some other equivalents (at least of the
200-1) have a (second) transformer, (some) with the labels 4K on one leg
of a center-tapped side and 2K on the other (not center-tapped) side. It
also has the label "input transformer".

Suggestions for a (hopefully inexpensive) reasonable match/replacement
for this part, that is readily purchased somewhere greatly appreciated?

Thanks.


Last I checked, Mouser had a page of "subminature audio transformers" or
something like that.

The specs on these things are variable enough that something nearby will
probably work (a factor of 2 or thereabouts). For a couple of different
manufacturer's parts, the impedance (and turns ratio) matches, but, for
the cheap guys, you'll find the actual inductance of the windings shows
that they put the minimum amount of wire in there. Great leeway can be
had with the minimum and maximum frequency response. (Lower inductance
windings will end up with a higher value for the low frequency limit).
They'll spec the frequency response, but usually don't spec the winding
inductances (which can vary with the core material, and with a bunch of
other nonlinear crap when in operation).

So a good manufacturer's 1k ohm transfomer might be the same as a
cheap guy's 2k transformer. these days, most of this stuff is some
job shop in China, so "it's suck it and see" if you're buying a one off,
retail


Mark Zenier mzenier_at_eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)

Ian Field
Guest

Tue Sep 24, 2013 3:24 am   



<learntrade_at_yahoo.com> wrote in message
news:e849f321-309a-47a1-a245-ad61292ff8f9_at_googlegroups.com...
Quote:
A number of the radio shack science fair electronics learning kits (at
least 150-1, 160-1, 200-1) and some other equivalents (at least of the
200-1) have a (second) transformer, (some) with the labels 4K on one leg
of a center-tapped side and 2K on the other (not center-tapped) side. It
also has the label "input transformer".

Suggestions for a (hopefully inexpensive) reasonable match/replacement for
this part, that is readily purchased somewhere greatly appreciated?


In the UK: Maplin sell the LT44 (driver) & LT700 (output) - I believe these
items were originally sold under the Eagle International brand.

David K. Bryant
Guest

Mon Oct 07, 2013 3:49 am   



Quote:
Suggestions for a (hopefully inexpensive) reasonable match/replacement
for this part, that is readily purchased somewhere greatly appreciated?


I'd like to help you, but first I'll need
your telephone number so we can begin the
transaction.



--- news://freenews.netfront.net/ - complaints: news_at_netfront.net ---

Michael Lalonde
Guest

Sat Dec 07, 2013 6:41 pm   



x-no-archive: yes
Radio Shack used to carry a lot of learning kits and gadgets, now all they
sell are bags of assorted resistors. :(

Michael Lalonde
Sudbury, Ontario - M&J Mining
xx

T
Guest

Mon Dec 09, 2013 8:30 am   



In article <52a3096f$0$25405$c00b7f07_at_94.232.116.90>,
LalondeMiningCA_at_outlook.com says...
Quote:

x-no-archive: yes
Radio Shack used to carry a lot of learning kits and gadgets, now all they
sell are bags of assorted resistors. :(

Michael Lalonde
Sudbury, Ontario - M&J Mining
xx


Yes indeed - I happened by their web site to try to find a gift for a
little interchange we at DC401 are doing. Couldn't find antyhing
worthwile in the $30 range.

Don Bruder
Guest

Mon Dec 09, 2013 8:30 am   



In article <MPG.2d0da9c09e2249f8989f0a_at_news.eternal-september.org>,
T <kd1s.nospam_at_cox.nospam.net> wrote:

Quote:
In article <52a3096f$0$25405$c00b7f07_at_94.232.116.90>,
LalondeMiningCA_at_outlook.com says...

x-no-archive: yes
Radio Shack used to carry a lot of learning kits and gadgets, now all they
sell are bags of assorted resistors. :(

Michael Lalonde
Sudbury, Ontario - M&J Mining
xx

Yes indeed - I happened by their web site to try to find a gift for a
little interchange we at DC401 are doing. Couldn't find antyhing
worthwile in the $30 range.


The last thing I actually bought at a radio shack was a couple of $6 R/C
cars. Which I took home and promptly gutted down to the circuit-boards.
After some experimenting with controller, VOM, and oscilloscope, I
tapped into the RC board to get the forward, backward, left, and right
signals the controller sent to control the car, then used those to
instead drive a pair of controllers handling a matched pair of stepper
motors from a couple old flatbed scanners. The whole mess got wired and
bolted together to make a radio-controlled stepper-motor driven pan/tilt
mount for a wireless camera. It took a little more doing, and a PIC-18
(*MASSIVE* overkill) I had laying around, to wire the transmitter to my
computer's USB port, and some coding to talk to it, but eventually, that
rig turned into a motion sensing camera that could track a deer or a
turkey as it traversed the hillside behind the house :)

--
Security provided by Mssrs Smith and/or Wesson. Brought to you by the letter Q

Ian Field
Guest

Mon Dec 09, 2013 11:55 pm   



"T" <kd1s.nospam_at_cox.nospam.net> wrote in message
news:MPG.2d0da9c09e2249f8989f0a_at_news.eternal-september.org...
Quote:
In article <52a3096f$0$25405$c00b7f07_at_94.232.116.90>,
LalondeMiningCA_at_outlook.com says...

x-no-archive: yes
Radio Shack used to carry a lot of learning kits and gadgets, now all
they
sell are bags of assorted resistors. :(

Michael Lalonde
Sudbury, Ontario - M&J Mining
xx

Yes indeed - I happened by their web site to try to find a gift for a
little interchange we at DC401 are doing. Couldn't find antyhing
worthwile in the $30 range.


Nearly a year ago rumours were floating about that Radio Shack was planning
to re-open stores in the UK - so far those rumours seem to have fizzled out
and sunk without trace.

In Hitchin Hertfordshire; there is a store that I think probably was once
RS, they're still there selling pretty much the same old tat, a Radio Shack
store in all but name.

http://www.bdsouthmidlands.co.uk/company-details.asp?bn=Kotecha+Giftronics&bid=85556

Michael Black
Guest

Thu Dec 12, 2013 3:54 am   



On Mon, 9 Dec 2013, Ian Field wrote:

Quote:


"T" <kd1s.nospam_at_cox.nospam.net> wrote in message
news:MPG.2d0da9c09e2249f8989f0a_at_news.eternal-september.org...
In article <52a3096f$0$25405$c00b7f07_at_94.232.116.90>,
LalondeMiningCA_at_outlook.com says...

x-no-archive: yes
Radio Shack used to carry a lot of learning kits and gadgets, now all they
sell are bags of assorted resistors. :(

Michael Lalonde
Sudbury, Ontario - M&J Mining
xx

Yes indeed - I happened by their web site to try to find a gift for a
little interchange we at DC401 are doing. Couldn't find antyhing
worthwile in the $30 range.

Nearly a year ago rumours were floating about that Radio Shack was planning
to re-open stores in the UK - so far those rumours seem to have fizzled out
and sunk without trace.

Actually, you can't go to a Radio Shack in Sudbury.


But there were rumors of a comeback to Canada too.

About 1971, Radio Shack set up a division to operate in Canada, and
started opening stores. Then decades later, the division, Intertan, was
launched as a standalone company, I seem to recall they were responsible
for "international" operations too. Intertan paid for the rights to
the name and had some agreement in place to buy from the US company. And
at some point, around a decade ago, Best Buy bought Radio Shack in Canada.
It continued as Radio Shack, the agreements still in place. But, Radio
Shack in the US didn't like to see the operation with their name on it
being owned by a competitor in Canada, so they went to court, the previous
deal was annulled, and Radio Shack in Canada became The Source by Best
Buy.

It continued pretty much the same, though by then Radio Shack in Canada
had already started stocking brands other than Radio Shack, and they may
have dumped the parts already, I remember an instance of a great sale on
parts but I can't remember if it came before or after the name change.

I gather the same thing happened in the UK, the Radio Shack stores sold to
some other chain.

And it went on, until Best Buy wasn't doing so well, at which point they
sold the chain to Bell (yes, the telephone company, that also owns
internet and cable and cellphone subdisiaries, the big CTV network here in
Canada and various cable channels). And it stays the same, fewer and
fewer parts. And unlike the old days, they never put the parts in the
flyers, especially not on a sale price, so what parts are still there are
relatively invisible, though still on the racks. They don't keep many
semiconductors, it's mostly generic parts.

Michael


Quote:
In Hitchin Hertfordshire; there is a store that I think probably was once RS,
they're still there selling pretty much the same old tat, a Radio Shack store
in all but name.

http://www.bdsouthmidlands.co.uk/company-details.asp?bn=Kotecha+Giftronics&bid=85556


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