Adding a line-in to an audio device allows it to be used as a powered speaker for your computer. You will be able to listen to the signal from the sound card, for example, through a receiver or a radio tape recorder.
Instructions
Step 1
Unplug the device that you want to turn into computer speakers from the network. Open its case. Drill a hole in the back wall for the cable through which the audio signal will be sent.
Step 2
Take headphones that have damaged speakers, but the cable is intact. Cut off the speakers, and tin the wires going to them. Do not use a lighter or knife to clean them - in the first case, they may stop getting tinned, and in the second they will be damaged. Use a rosin-coated soldering iron to press them against a wooden board, and the insulation will be stripped from the wires without damaging them. After that, tin them in the usual way.
Step 3
Pass the cable through the hole in the case made in the first step. From the inside, tie it in a knot so as not to accidentally pull it out. Leave sufficient cable length inside. Connect the yellow or gray wires together and connect to the common wire of the audio device. Find the volume control in it. Connect the blue or green wire to the input of the volume control of one of the channels through the capacitor at 0.1 microfarads, and the orange or red wire through the same capacitor to the input of the control of the other channel. If the device is monaural, connect only one of the wires, and insulate the other (or even do not strip or tin). In this case, only one capacitor is needed.
Step 4
Assemble the audio device, set the volume control to zero, connect it to the computer and the network, start playing any sound, then set the desired volume of the controls. On the device itself, select a mode in which the amplifier is turned on, but no signal from the built-in sources is received by it. If the monitor is a tube monitor and the speakers of the receiver or radio are not magnetically shielded, place the unit farther from the monitor. Also, do not place magnetic storage media near it.
