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3.5mm (Male Plug) Stereo to 2.5mm (Female Jack) Mono Adapter

3.5mm (Male Plug) Stereo to 2.5mm (Female Jack) Mono Adapter
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3.5mm (male plug) stereo to 2.5mm (female jack) mono adapter • Part No. 7125MON

Adapter Enables 2-Conductor Plug (Mono) Plug to Connect into 3-Conductor Jacks of Stereo Equipment

  • Adapts your 2-conductor 2.5mm male plug devices to correctly work with 3.5mm 3-conductor stereo devices

  • Mono audio plugs have 2 conductors separated by one band

  • The female jack of this adapter is a sub-miniature 2.5mm 2-conductor mono jack

  • The male plug end of this adapter is a standard 3-conductor 3.5mm stereo plug

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3.5mm (male plug) stereo to 2.5mm (female jack) mono adapter • Part No. 7125MON

Connect your 2.5mm Male Audio Plug to Audio Equipment with a Standard Stereo 3.5mm Size Jack

  • Male plug is a gold-plated 3.5mm 3-conductor male stereo plug that is common to most stereo audio devices
  • Female jack is a gold-plated recepticle that accepts a 2.5mm mono 2-conductor style plug
  • Use this adapter with any specialty equipment that has a 2.5mm size male mono plug
  • Keep in mind that a mono plug has 2-conductors separated by a single black band

How do you tell the difference between Stereo and Mono types of audio plugs?

Some people think that stereo means two earpieces and mono means one earpiece, but that is not correct. It all depends on the plug wiring. It is conceivable that you could have a mono earphone with two earpieces. Take a look at the plug.

A mono plug will have one black stripe that separates two metal conductors. This is known as TR (tip-ring). The tip is the audio and ring is the return ground for one channel of sound.

A stereo plug will have two black stripes that separate three metal conductors. This is known as TRS (tip-ring-sleeve). The sleeve is usually ground, and the tip and ring are for two channels of stereo audio.

A stereo headset will usually have three black stripes that separate four metal conductors. This is known as TRRS (tip-ring-ring-sleeve). The sleeve is usually ground, and the tip and ring are for two channels of audio, with an extra ring being used for microphone audio and switching.

What size of plugs are used with most audio devices?

Currently the most common plugs that are used for stereo equipment are the 3.5mm 3-conductor audio plugs. These are widely used on small pocket-sized audio devices and are known as "miniature" audio plugs. The 3.5mm size plug is also commonly referred to by its inch equivalent as the 1/8 inch size stereo plug. It was not all that long ago when most headphones would plug into audio amplifiers and stereo sound systems and they used a 1/4-inch diameter plug and were commonly referred to 1/4-inch "phone plug" that is now referred to commonly as the 6.35mm size plug. The 1/4-inch phone plug is still commonly used on guitars and production studio equipment. Many very small portable devices used a plug size that was smaller than the earphone jacks we find today. That smaller sized plug was known as the "sub-miniature" plug, and it is now commonly called a 2.5mm plug. You probably have seen this size jack on cordless telephone jacks. The 2.5mm jack size is not quite as common today as we have gradually consolidated all the personal electronics equipment to the 3.5mm stereo plug and jacks that are found on an iPod, iPad and mp3 players.

  • Our 7125MON Adapter was designed to allow you to plug your small sub-miniature 2.5mm mono plug into an adapter that then goes into the 3.5mm stereo jack, used commonly on most stereo equipment
  • If you have a specialty audio product with a sub-miniature (2.5mm) mono plug and want to use it with an audio device that accepts a larger 3.5mm stereo plug, then you will find our 7125MON audio adapter will do the job

7125MON Adapter Specifications 
Input Jack - 2 Conductor Mono 2.5mm Gold-Plated (Female) Jack 
Output Plug - 3 Conductor Stereo 3.5mm (Male) Plug 
Size - Adds 1-inch of length to the plug going into your audio device 
Accepts Mono Earphones, Headphones or Audio Plugs that have a Subminiature 2.5mm Plug with 1 Black Band
Adapter Plugs into Audio Equipment that Accepts a Standard 3.5mm size Stereo Audio Plug
Color -Black

Additional Information

Additional Information

Plug Type 3.5mm 3-Cond Stereo
Jack Type 2.5mm 2-Cond Mono
Plug Plating Gold
Plug style No
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