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Older Revision of Single Pin Mono Headset Pin-Out

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Single Pin Mono Headset Pin-Out

The mono headset is a combined ear speaker and microphone used with many classic mobile phones and 2-way radios. It generally have a 3.5mm (mini) audio connector or a 2.5mm (sub-mini) audio connector (see photo below). Both sizes are standard in the audio world. It's single pin connector has three contacts.

This 1-pin connector is usually wired up in the following manner:

1 - ground
2 - speaker
3 - microphone

The ground contact is shared with the speaker and micro phone contact.

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Headset Examples

The following photo shows a security headset with a 1-pin connector for 2-way radios.

The following photo shows a Jabra Classic EarSet with a 1-pin connector for cell phones.

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