If your digital receiving device uses the Crystal CS841X digital receiving chip, then this simple modification is meaningful. Now many DAC devices use the CS841X chip, so we still write this A simple way to transform. Otherwise, this modification is meaningless. Before modification, please confirm whether the digital receiving chip of the digital receiving device is CS841X. Optical fiber transceiver components generally have 3-4 pins, with 3 functions in one, positive 5V input, signal and ground. It is very simple to make a coaxial adapter. Correctly match the pins to the RCA terminals. Just connect the 5V voltage. However, optical transceivers are not easy to buy. Even if they are available, they are not cheap. The best way is to start with a daughter card with a coaxial and optical terminal sound card. The following example uses the BlackGold II daughter card as an example of transformation.
The daughter card of BlackGold II has optical fiber and coaxial input and output, as well as power input and other interfaces, and it is very simple to modify. And there are separate sales.
The row of Pins on the daughter card defines different functions. Check the BlackGold II user manual and you can see that Pin25/26 is the power input we need, of which 25 is the 5V input and 26 is the power input. Ground wire, such a power supply is easy to get in the computer. Take a look at the power plug in your case. It is easy to find the one arranged in yellow, black, and red. The red represents 5V and the black represents the ground wire. Make a ground wire. Let’s wire it up. It’s quite simple. We won’t go into details about how to make this wire. You may think that the plug connected to the daughter card is hard to find. Look for an LED wire on the chassis. The plug can be used.
The pin definitions of different optical fiber transceivers are different. The pin definitions of the optical fiber transceivers on the BlackGold II daughter card are as shown in the figure. Please be sure to distinguish them clearly.
This is the pin definition of the coaxial socket.
Prepare a soldering iron with a sharp tip. The solder joints on the daughter card are relatively dense, so this type of soldering iron is suitable.
Connect the signal pins of the coaxial output socket and the signal pins of the optical fiber input socket, taking care to prevent short circuits. What’s the next step? You can use it in the next step, haha, it’s that simple. Be careful not to plug in the power input backwards, otherwise the fiber optic transceiver may be burned. This modification is very simple, but it can expand the coaxial output capability of any sound card or CD player with optical output. The hardware has not been changed beyond recognition, and it is very easy to restore. This modification makes the DMX 6 Fire LT we have on hand You can smoothly connect to SVDAC01 and get a gratifying improvement in sound quality. Maybe you will ask, why not connect DMX 6 Fire directly to the BlackGold II daughter card? There are two reasons. After this transformation, we can add coaxial output capability to all sound sources that only have optical fiber output capability. 2. Come to us I don’t want to lose the recording capability of DMX 6 Fire LT (the MIC in of DMX 6 Fire is located on the daughter card). In addition, the pin definition of DMX 6 Fire is not disclosed, which will cause great trouble for direct connection.