Some wired telephone handsets are removable. If this unit is lost, do not rush to replace the entire apparatus. You can also make a tube for him yourself.
Instructions
Step 1
The cord connecting the handset to the telephone itself uses 4P4C connectors (sometimes they are not quite correctly called RJ-9). It differs from the 6P4C type connector (officially called RJ-11), used in cords to connect a telephone to an outlet, it differs in a smaller width. This is due to the fact that the tube connector has reduced the number of contacts from six to four due to the rejection of two lateral ones, which are not used anyway. Take two of these connectors and connect their pins of the same name with a twisted four-wire cable of the desired length. Use a ready-made cable if desired.
Step 2
Take the case from the broken tube. Make sure it is properly shaped to fit on the cradle of your existing telephone. Install an RJ-9 socket on the microphone side. Connect this outlet with the cord to the telephone set to be connected to the line. Take a small-sized speaker with an impedance of about 30 Ohm (if the speaker of the donor tube is not preserved, take it from the headphones - the sound will be a little worse) and try carefully, without touching live parts, to connect it to various combinations of contacts of this outlet. Find the two pins where you hear a beep from the speaker when connected, and leave it connected to them. After disconnecting the device from the line, fix the connections by soldering, then isolate.
Step 3
Connect the electret microphone to the remaining two contacts. Reconnect the machine to the line and the handset to the machine. Try blowing into the microphone - you should hear a hiss in the speaker. If not, disconnect the device from the line, reverse the polarity of the microphone connection, then reconnect and check.
Step 4
After turning off the phone again, place the microphone and speaker in the appropriate compartments of the handset, then, after making sure that the conductors are not pinched anywhere, close the case. Turn on the device, put the receiver on it - it should press the lever with its weight. If it turns out that it is too light, weight it by placing a special weighting steel plate from the old tube inside the case. Fix it well so that it does not move and cause short circuits.
