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Metal Detectors
Minelab
Interesting Modified SDC2300 On Gumtree
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<blockquote data-quote="mbasko" data-source="post: 596792" data-attributes="member: 4485"><p>The 3rd wire (white?) is possibly the built in speaker on/off wire.</p><p>I.e. in a normal Minelab audio set up using normally wired stereo (TRS) headphones the sleeve connection will turn any in built speaker off (or in the case of the GPX battery the amp) when headphones are inserted. </p><p>For the GPX battery an external speaker needs to be wired to tip & ring only for the amp to cut in (picture below) or on other detectors once the headphones are removed (no sleeve connection) the speaker turns on.</p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4485/1613796463_20210220_154712.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I wouldn't be surprised if the SDC plug has this 3rd wire to deactivate the external speaker when you plug the headphones in or activate it when they are removed. </p><p>The external switch probably isn't required when wired correctly?</p></blockquote><p></p>
[QUOTE="mbasko, post: 596792, member: 4485"] The 3rd wire (white?) is possibly the built in speaker on/off wire. I.e. in a normal Minelab audio set up using normally wired stereo (TRS) headphones the sleeve connection will turn any in built speaker off (or in the case of the GPX battery the amp) when headphones are inserted. For the GPX battery an external speaker needs to be wired to tip & ring only for the amp to cut in (picture below) or on other detectors once the headphones are removed (no sleeve connection) the speaker turns on. [img]https://www.prospectingaustralia.com/forum/img/member-images/4485/1613796463_20210220_154712.jpg[/img] I wouldn't be surprised if the SDC plug has this 3rd wire to deactivate the external speaker when you plug the headphones in or activate it when they are removed. The external switch probably isn't required when wired correctly? [/QUOTE]
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Metal Detectors
Minelab
Interesting Modified SDC2300 On Gumtree
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