ATTENTION! TELEPHONE OFF-HOOK INDICATOR. This circuit provides a steady logical "high" indication when the telephone is off its hook., as all other schemes are located on the sites of their rightful owners. We are not liable for the contents of other sites as well as the site having a circuit TELEPHONE OFF-HOOK INDICATOR. This circuit provides a steady logical "high" indication when the telephone is off its hook.. Pressing the button you must get onto a page with TELEPHONE OFF-HOOK INDICATOR. This circuit provides a steady logical "high" indication when the telephone is off its hook..
