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Radio shack Kit Question on transformer

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Ken
Guest

Fri Dec 30, 2005 8:03 am   



Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O

Don Bowey
Guest

Fri Dec 30, 2005 5:18 pm   



On 12/30/05 12:03 AM, in article
K5btf.6401$l87.729761_at_news20.bellglobal.com, "Ken" <lerameur_at_sdom.com>
wrote:

Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O



It is an audio output transformer, 900 Ohms to 8 Ohms, to connect to an 8
Ohm speaker. The 900 Ohm side may be center tapped.

Don

DaveM
Guest

Fri Dec 30, 2005 8:17 pm   



"Ken" <lerameur_at_sdom.com> wrote in message
news:K5btf.6401$l87.729761_at_news20.bellglobal.com...
Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information
I have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O


It's just a plain old audio output transformer. You already have the most
important specs: 900 ohms primary impedance with a center tap, 8 ohms
secondary impedance. Since this is a learning kit, I'm assuming that it is
low power, maybe a few hundred milliwatts.
I suggest one such as this from www.mouser.com as a close replacement:

Catalog # 42TU008
Primary 800 ohms CT
Secondary 8 CT
400 mw
$ 2.19 each

It's not an exact match, but, since it's an experimenter's kit, it's
insignificant. It will still work in the kit.
--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!

Jasen Betts
Guest

Fri Dec 30, 2005 10:32 pm   



On 2005-12-30, Ken <lerameur_at_sdom.com> wrote:
Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O

looks like a transformer giving 900 ohms centre tapped on one side and 8
ohms on the other. these were popular in early transistorised products
(especially those that used 9V batteries)

if that's one of those "30 in one" "learn electronics" type kits
any audio transformer that's a "ballpark" match should work.

For example Jaycar cat# MM-2532 "1000 ohms CT to 8 ohms" (www.jaycar.com.au)
I expect there's a supplier nearer you with a similar product.

Bye.
Jasen

ian.field1
Guest

Sat Dec 31, 2005 12:16 am   



"Ken" <lerameur_at_sdom.com> wrote in message
news:K5btf.6401$l87.729761_at_news20.bellglobal.com...
Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information
I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O


Maplin do a pair of audio transformers - LT44 & LT77, one is a driver with
single primary/CT - secondary, the other is for O/P, CT - pri' & single LS
impedance secondary.

c a l a n d e
Guest

Sat Dec 31, 2005 2:09 am   



Ken wrote:

Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O




Ken,

I buy, refurbish and resell these Radio Shack kits. I have a transformer
from an od 65-In-One kit that I'm pretty sure is an exact replacement
for the one you need.

If you're interested I'd be glad to send it to you for $2.00.


Ray Calande


Remove the 86 to reply.

UFO Joe
Guest

Sat Dec 31, 2005 3:29 am   



I've got tons of those kits, going back 30 years.
I'm an amateur, but if I can help you...

Radio Shack used to sell them separately.

(We lost our Radio Shacks here in Canada - the Colonies - they were bought
out by some oversized American Crap company - Circuit City - now they're
into going for the big bucks
with Big Screen TVs and such, anyhow, forgive me, I digress.)

Radio Shack used to sell them as "Miniature Audio Transformers" if that is
any help.

The numbers on the board are the resistance, 900 Ohms in and 8 Ohms out
(Most speakers are 4-9 Ohms)

I really hope this helps you to find a suitable replacement.

"Ken" <lerameur_at_sdom.com> wrote in message
news:K5btf.6401$l87.729761_at_news20.bellglobal.com...
Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information
I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------


Ken
Guest

Sat Dec 31, 2005 1:56 pm   



Quote:

if that's one of those "30 in one" "learn electronics" type kits
any audio transformer that's a "ballpark" match should work.

For example Jaycar cat# MM-2532 "1000 ohms CT to 8 ohms"
(www.jaycar.com.au)
I expect there's a supplier nearer you with a similar product.



Well you are right, Radio shack 200 in 1 kit.
supplied by a max of 9volts

Ken

And that you for all the help.

Ken
Guest

Sat Dec 31, 2005 3:45 pm   



Because I do not have all the working parts. I decided to simulate this
circuit in pspice. I wanted to add this part the circuit. ( I only worked
with very simple circuit using a simulator,..capacitor resistor) there are
many to chosse from also , I wanted to add a transistor A733, there is none
in the simulator, how do I go about chooosing out of the 100 shown in the
simulator ??

thank you

Ken

Jim Thompson
Guest

Sat Dec 31, 2005 10:55 pm   



On Sat, 31 Dec 2005 16:45:26 +0100, "Ken" <lerameur_at_sdom.com> wrote:

Quote:
Because I do not have all the working parts. I decided to simulate this
circuit in pspice. I wanted to add this part the circuit. ( I only worked
with very simple circuit using a simulator,..capacitor resistor) there are
many to chosse from also , I wanted to add a transistor A733, there is none
in the simulator, how do I go about chooosing out of the 100 shown in the
simulator ??

thank you

Ken


Get/Place Part Q2SA733

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

"Winners never quit, quitters never win", Jack Bradley Budnik ~1956

Robert Baer
Guest

Sun Jan 01, 2006 8:12 am   



Ken wrote:

Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O


Without looking, it is obvious to me; 900 ohm CT input and 8 ohm

output (to drive speaker or headphone) connects to the output push-pull
stage of an audio amplifier (or that part of a radio).

safemale
Guest

Mon Mar 20, 2006 4:30 pm   



rat shack used to have them
i think
ham friend used them in the mic line of his home made rig blaster
sound card radio interface
safemale
On Fri, 30 Dec 2005 09:18:42 -0800, Don Bowey <dbowey_at_comcast.net>
wrote:

Quote:
On 12/30/05 12:03 AM, in article
K5btf.6401$l87.729761_at_news20.bellglobal.com, "Ken" <lerameur_at_sdom.com
wrote:

Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O



It is an audio output transformer, 900 Ohms to 8 Ohms, to connect to an 8
Ohm speaker. The 900 Ohm side may be center tapped.

Don



Guest

Tue Sep 03, 2013 12:51 pm   



On Friday, December 30, 2005 3:03:30 AM UTC-5, Ken wrote:
Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O


(old thread, but appropriately related, I think...)

A number of the radio shack science fair kits (at least 150-1, 160-1, 200-1) and some other equivalents (at least of the 200-1) have a (second) transformer 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.

Michael Black
Guest

Mon Sep 09, 2013 11:10 pm   



On Tue, 3 Sep 2013, learntrade_at_yahoo.com wrote:

Quote:
On Friday, December 30, 2005 3:03:30 AM UTC-5, Ken wrote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O

(old thread, but appropriately related, I think...)

A number of the radio shack science fair kits (at least 150-1, 160-1,
200-1) and some other equivalents (at least of the 200-1) have a
(second) transformer 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.

Don't be a google-idiot.


If you have to ask a quesiton, then post away. Dont' tack it onto an old
thread, especially not when the problem is that google hasn't fixed the
interface to not allow postings to threads older than 30 days. The rest
of us don't see the thread on some webpage, the old messages are long in
the past.

YOu haven't added anything to the old thread, and the old thread didn't
need any addtions. You cant' justify why you replied to that old post,
you just think it's appropriate.

I thought this was a web type habit, that it was acceptable in the web
forum world. Yet I saw a message on one of the so many web forums that
people have moved to instead of good old usenet, and it was about how
there's no need to resurrect an old thread.

Michael


Guest

Sun Oct 12, 2014 3:56 pm   



On Friday, 30 December 2005 08:03:30 UTC, Ken wrote:
Quote:
Hello,

I have a kit that I bougfht from RAdio Shack , Here is a link of what I am
talking about. (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=6019532542&indexURL=
)

I would just like to know what are on the transformers in this kit , There
are no part numbers and I need to replace that part.. The only information I
have is what is written on the board:
Output Transformer
900 8
----- -------
-
-----
-
----- ---------
Three legs going in and two out with these numbers on top.
Thank you for your help

Ken O


Dear Ken

The Eagle LT700 audio output transformer will be a close match to what you require. Maplin Electronics still have them, or else try Rapid Electronics www.rapidonline.com or jabdog in the UK. Try Circuit Exchange International www.zen22142.zen.co.uk for more component suppliers.

Robert N

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