The attached link takes you to an image which shows a mono version of such a device. You will see an open contact with the jack inserted. http://upload.wikimedia.org/wikipedia/commons/a/af/Jack-plug--socket-switch.jpg
The attached link takes you to an image which shows a mono version of such a device. You will see an open contact with the jack inserted. http://upload.wikimedia.org/wikipedia/commons/a/af/Jack-plug--socket-switch.jpg
