3.5mm 2-Conductor Mono (Male Plug) to 3.5mm 3-Conductor Stereo (Female Jack) Adapter

3.5mm 2-conductor mono (male plug) to 3.5mm 3-conductor stereo (female jack) adapter • Part No: M2SA

This adapter enables a 3-conductor plug stereo earphone or headphone to be used with a 2-conductor mono audio jack.

So you have stereo earphones or stereo headphones and you want to plug those into your trusty old table radio, tape recorder, walkie talkie or dictiphone transcription recorder. This may be the adapter for you. You can tell that you have a stereo headphone or stereo earphone by examining the plug. Stereo plugs will have three metal contacts that are separated by two black bands.

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 (with built-in microphone) 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.

• Our M2SA Adapter will enable you to connect your 3-conductor stereo earphones to a single channel audio device that has MONO sound
• Listen to that older Radio or Tape Recorder using your Stereo Headphones
• Some users have other kinds of audio equipment like guitar amplifiers, hearing assist listening devices that use a Mono jack
  
• Will enable you to listen to Mono Audio in Both the Left and Right Ear of your Stereo Headphones that you might otherwise hear in only one ear 
• If you're converting your old recordings to record onto a stereo disc or tape, you'll want one of these
• Plug Stereo Earphones into Adapter, and then Plug the Adapter into Your Mono Audio Equipment
• Enables Stereo Earphones to Hear the Audio in Both Ears when Plugged into a Pocket Talker Audio Assist Device
• I use it when I listen to my dictation recorder (scroll down to see picture below). The tape recorder is mono and the headphones plugged in through the adapter are stereo headphones

M2SA Adapter Specifications 
Input Jack - 3 Conductor Stereo 1/8-inch (3.5mm) sub-miniature jack 
Output Plug - 2 Conductor Mono 1/8-inch (3.5mm) sub-miniature plug 
Size - Adds 1-inch of length to the plug going into your audio device 
Color -Black

NOTE: Take into consideration that if you plug the M2SA 2-conductor plug adapter into a 3-conductor stereo jack, it will short out the RIGHT channel, so you only hear the LEFT channel. All Stereo female jacks made with a LEFT and RIGHT channel accept 3-conductor plugs (two black bands on the plug). We an adapter for the 3-conductor plugs, and it is called the 1BUD-S2MA Stereo-to-Mono Converter. That converter will electronically mix the LEFT and RIGHT audio channels together properly so there is no short.