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RadioShack® Audio Output Transformer

Model:

EI-19

 | Catalog #: 273-1380
Price:
$2.99
$2.99
 

Free Shipping

(Free Ground Shipping on orders over $50Details)
 

Expected Delivery: 3-5 business days

(Some exceptions apply.Details)
 

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(Online and In-store returns.Details)

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Availability:

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Product Summary

Quality transformers.

This audio output transformer is perfect for various audio/video projects. Feature includes audio output and low-level impedance matching.

  • Frequency response: 300Hz to 10kHz
  • 1,000-ohm center-tapped primary
  • 8-ohm secondary
  • Low-level impedance matching

You'll also need

  • Audio Circuit
Pricing and availability: Please note that all prices are subject to change without prior notice. Prices advertised on this site are for online orders only. Prices on some items may differ from those advertised in RadioShack stores. All merchandise may not be available at all stores, and all stores may not participate in all sales promotions. We recommend you contact the store to confirm product availability and price.

What's in the box

  • Audio Transformer
 

Shipping

Usually ships in 1 - 2 business days

What shipping method is right for me?

Other ways to get it


In store: Check availability
By phone: 1-800-843-7422

Manufacturer Warranty

  • Parts: 90 days
  • Labor: 90 days
Tech Specs

Customer Reviews

REVIEW SNAPSHOT®

by PowerReviews
RadioShack® Audio Output Transformer
 
4.2

(based on 21 reviews)

Ratings Distribution

  • 5 Stars

     

    (10)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

90%

of respondents would recommend this to a friend.

Pros

  • Versatile (15)
  • Reliable (12)
  • Rugged (9)

Cons

    Best Uses

        • Reviewer Profile:
        • Power user (8), Enthusiast (5), Practical (3), Professional (3)
        • Primary use:
        • Personal (17), Business (3)
        • Was this a gift?:
        • No (11)

      Reviewed by 21 customers

      Sort by

      Displaying reviews 1-10

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      5.0

      Quality, working, reliable product.

      By I Know Jack

      from Minnesota

      About Me Enthusiast

      Verified Reviewer

      Pros

      • Consistent Performance
      • Rugged
      • Versatile

      Cons

        Best Uses

          Comments about RadioShack® Audio Output Transformer:

          I've bought and used over 100 of these audio transformers in amps and impedance matching boxes I've built. I have not had one bad transformer in the many lots I've bought. They are a good, quality product you can trust.

          • Primary use:
          • Business
          • Was this a gift?:
          • No

          (4 of 4 customers found this review helpful)

           
          3.0

          Audio Transformer

          By Pierre

          from Nantucket, MA

          About Me Power User

          Verified Buyer

          Pros

            Cons

              Best Uses

                Comments about RadioShack® Audio Output Transformer:

                Wanted 2 transformers. One I found with the order number provided by QST Magazine. The other Transformer was discontinued without any replacement suggestions.
                Found proper products at Mouser for half the Money and their parts arrived 2 days before RadioShack shipment. Will never order again.
                The people in the local store are not knowledgeable at all... only out to sell JUNK

                • Primary use:
                • Personal
                • Was this a gift?:
                • No

                (2 of 5 customers found this review helpful)

                 
                5.0

                I have used this before

                By Technopagan

                from Geraldine, Montana,

                About Me Power User

                Verified Reviewer

                Pros

                • Versatile

                Cons

                  Best Uses

                    Comments about RadioShack® Audio Output Transformer:

                    To get a good idea on how to use this transformer, look in the book Shack sells "Getting Started In Electronics"

                    • Primary use:
                    • Personal
                    • Was this a gift?:
                    • No

                    (1 of 2 customers found this review helpful)

                     
                    5.0

                    Excellent Part

                    By _hammer_

                    from St.Louis, MO

                    About Me Casual User

                    Verified Reviewer

                    Pros

                    • Rugged
                    • Versatile

                    Cons

                      Best Uses

                        Comments about RadioShack® Audio Output Transformer:

                        A 2n2222 transistor, this transformer, and just a few other small parts make an excellent audio amp for simple ham radio projects. Where we once needed 2000 ohm phones, an 8 ohm set will do when this transformer is used.

                        • Primary use:
                        • Personal
                        • Was this a gift?:
                        • No

                        (6 of 6 customers found this review helpful)

                         
                        4.0

                        For NotAVirus:

                        By Halfhalt

                        from NE TN

                        About Me Power User

                        Verified Reviewer

                        Pros

                        • Consistent Performance

                        Cons

                          Best Uses

                            Comments about RadioShack® Audio Output Transformer:

                            I've used this tranformer for several Amateur Radio applications and it worked as expected.

                            The turns ratio can be calculated by taking the square root of the ratio of the impedances. In this case, the square root of 1000/8, or 11.18

                            • Primary use:
                            • Personal
                            • Was this a gift?:
                            • No

                            (18 of 25 customers found this review helpful)

                             
                            1.0

                            Probably exactly what I needed.....

                            By NotAVirus.exe

                            from Ogden Utah

                            About Me Power User

                            Verified Reviewer

                            Pros

                            • Available locally
                            • Good price

                            Cons

                            • Lacks Technical Specs
                            • Poorly Labled Package

                            Best Uses

                            • Unusable

                            Comments about RadioShack® Audio Output Transformer:

                            I was planning on getting two of these audio transformers for use in building a ring modulator for a friend. At first glance they looked perfect, they had a center tap, they were labled "Audio transformer", their price was almost equal to the cost of buying them from a mail-order supplier, and best of all I could buy them from my local radio shack instead of ordering one online. The problem was that there was ABSOLUTELY NO usable technical information on the package, sure there was stuff like freqency response and coil impedance, but nothing about the model of transformer or the ratio of turns on the coil. I couldn't convince myself to buy it, I asked an employee about it and they asked another employee who simply said "it will work for what you need it to". That's just great, I need to have two transformers, both with center taps, and both with 1:1 coil ratios, and yet the only place that carries them locally doesn't have the proper specifications for me to determine if the component that I'm buying will actually work. That's not how electronics work, you can't just substitute one component for a similar one and expect it to work. Also for some reason when I visited not just one but two radio shacks, both of them only had one of these parts in stock yet I needed two, maybe just a coincidence. All in all I needed this product and yet there wasn't enough information available on the package or from the employees for me to make a purchase.

                            • Primary use:
                            • Personal
                            • Was this a gift?:
                            • No

                            (19 of 22 customers found this review helpful)

                             
                            4.0

                            Specs

                            By markbulla

                            from Washington, DC

                            About Me Power User

                            Verified Reviewer

                            Pros

                            • Versatile

                            Cons

                              Best Uses

                                Comments about RadioShack® Audio Output Transformer:

                                Transformer Specs (from the packaging):
                                Input Impedance: 1 kOhm at 1kHz (input is center tapped)
                                Output Impedance: 8 Ohms
                                DC Resistance (Input): 70 Ohms +/-20%
                                DC Resistance (Output): 0.62 Ohms +/-20%
                                Frequency Response: 300-10,000Hz +/-3dB
                                Insulation resistance: >100 MOhms @ 100VDC

                                Height: 0.625" (plus 0.196" tabs)
                                Width: 0.791"
                                Depth: 0.591"

                                • Primary use:
                                • Business
                                • Was this a gift?:
                                • No

                                (13 of 16 customers found this review helpful)

                                 
                                3.0

                                Need Real Specs

                                By Hobyist

                                from Sisters, Or

                                About Me Enthusiast

                                Pros

                                  Cons

                                    Best Uses

                                      Comments about RadioShack® Audio Output Transformer:

                                      A transformer spec should include all dimensions, the turns ratios, and the input/output impdedance as well as the frequency response and the weight.

                                      • Primary use:
                                      • Personal
                                      • Was this a gift?:
                                      • No

                                      (2 of 2 customers found this review helpful)

                                       
                                      4.0

                                      MP3 to XLR matching transformer

                                      By Denis

                                      from Cleveland, OH.

                                      About Me Casual User

                                      Pros

                                      • Versatile

                                      Cons

                                        Best Uses

                                          Comments about RadioShack® Audio Output Transformer:

                                          Mix left and right channels together with 2, 1k resistors to one side of the 1k primary and ground the other. Connect the 8 ohm side to the XLR signal lines. Connect the shild to the XLR and the metal box containing the transformer, if metal. Do not connect the MP3 shield to the box, keep isolated. Works with walkmans, boom boxes, computers too, any headphone jack.

                                          • Primary use:
                                          • Personal
                                          • Was this a gift?:
                                          • No

                                          (18 of 21 customers found this review helpful)

                                           
                                          4.0

                                          1K ohm center-tapped to 8 ohms

                                          By Joe Ham

                                          from 98258

                                          About Me Enthusiast

                                          Verified Reviewer

                                          Pros

                                          • Rugged
                                          • Versatile

                                          Cons

                                            Best Uses

                                              Comments about RadioShack® Audio Output Transformer:

                                              Interesting, the Web Page does not provide impedance specifications, but the package that I have in hand does. It is:

                                              273-1380
                                              Audio Output
                                              Transformer
                                              1K ohms center-tapped
                                              to 8 ohms

                                              -

                                              • Primary use:
                                              • Personal
                                              • Was this a gift?:
                                              • No

                                              Displaying reviews 1-10

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