In the first figure, the plug is not inserted, so the terminal 10 and 11 switches are closed routing the audio to the speaker. Switching Audio Between Speakers and Headphones The following are some conceptual examples that could apply to multiple applications. However, if you are needing to switch the audio between speakers and headphones, detect when the plug is inserted, use the inserted plug to control other portions of your circuit, or are using an audio mixing board, you will likely want to use a connector with a switching function. If you are simply plugging your headphones into an MP3 player to listen to music, you would not necessarily need an audio jack with switches. The application dictates how many and what type of switches are needed. Examples of additional switching functions Are Audio Jack Switches Needed? Many of these switches would be isolated from the audio signals and could be used to control other portions of a circuit. Some other switching functions would be classified as normally open, Single Pole Double Throw (SPDT), and Double Pole Double Throw (DPDT). The switches that we have looked at so far have all been normally closed switches. Schematic of a 4 conductor audio plug with 3 switchesĮven though this looks more complex, it is still has the same basic functionality of the single switch variation, except there are 2 additional switches present. Below is an example of a 4 conductor plug, with 3 switches located on the tip, ring 1, and ring 2 terminals. In a similar way, multiple switches could be present on different contacts.
Example showing the open contact between terminals 2 and 10 When the tip makes contact with terminal 2, it pushes this spring away from terminal 10 making the contact "open" between these terminals. Now again, we visualize the mating plug being inserted from left to right. It would typically be referred to as a "tip switch" since the switch is located on the "tip" terminal. The switch on the left shown below, is classified as normally closed because in the un-plugged state, terminal 10 is making direct contact (closed) with terminal 2. Now, we are going to add a switch to the terminal 2 position (tip). When reading the schematic, think of the plug being inserted from left to right to align with the respective terminals of the mating jack. Basic drawing of an audio plug and jack schematic This specific example does not include switches. Below is a plug diagram and basic schematic including the typical terminal designations. For this example, we will focus on the standard stereo connector with 3 conductors. Audio plugs can come with as few as 2 conductors up to 6 or more conductors.
#PUSH SWITCH SYMBOL ISO HOW TO#
Typical audio jack schematics showing various switching options How to Read an Audio Jack Schematicīefore we get to the switch function, first we need to understand how to read an audio jack schematic. Below are some typical schematics that show some of those switching options. These switches are often represented in a schematic for the connector available on the datasheet. Audio jacks are available without switches, with simple switches, or with complex switching systems. What is a Switch?Īt its basic definition relating to electrical connectors, a switch is a device for making and breaking the connection in an electric circuit.
In this post, we are going to look at how to read these schematics, describe the various switch types available, and discuss how they are implemented in audio applications. When looking at a seemingly simple audio jack datasheet, you will often find an array of schematics with a variation of switches and connections. To better understand some of their capabilities, we will dig into the "guts" of these connectors and see what they have to offer. While simple in their basic functionality, they can be used in complex systems. Audio jacks have been around for decades and have been used in a wide variety of applications.
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