![]() Thank you Joshua for taking the pains of modding my coax cable The proof is that I still use the same volume level as before. However, I'm ignoring this inconvenient bit since the cable is very short (1 to 1.5m at the most) so reflection losses due to mismatched transmission lines is low. The LPF end is intended to face the computer side.Īlso, in the interest of full disclosure, please understand that the characteristic impedance of Ethernet lines are 100 ohms and not same as the 75 ohms of SPDIF lines. In your link, the transformer has four pins so it is a straightforward case of finding which are the two pins for source end and destination end (this is not just notional and MAY NOT BE safe to interchange terminals as some pulse transformers have built in low pass filter. Please check for what application this pulse transformer is intended to know whether it can handle the max sampling frequency of SPDIF interface (192 kHz).įor example, the pulse transformer in the 10/100 Mbps LAN card is more than sufficient to carry 24/192 bit rate without degrading the signal as this pulse transformer is designed for much, much higher bit rate of 100 Mbps.Īlso, there doesn't seem to be a standard pin out. Use one more layer of heatshrink to hide the cable ties, etc.Įxperiment with direction - keeping the transformer nearer to source, or nearer to destination. After adjusting the heat shrink, use hot air gun to shrink it, then tie the shrunken portion to the cables using small nylon cable ties. I broke two pins due to my impatience.įor covering it, I used 12 mm diameter heatshrink to cover the assembly. Gripping the pulse transformer in a vice grip helps immensely. First suck away as much of the solder as possible from each pin, then heat up one row of pins while patiently prying it out. To desolder, you need a suction gun and lots of patience. The only difficult things in this project are desoldering the pulse transformer from the LAN card, and making an acceptable housing for this "network". In my chain, what used to be a soft bass when using this cable has tightened up substantially. ![]() It has drastically raised the performance of the cable. Intrigued by the idea, I risked cutting a perfectly working Belden 1855A SPDIF cable, about 1.5 inch from one RCA connector end and soldered the pulse transformer. The transformer can handle upto about 20 MHz frequency, which is sufficient to handle 24/192 data. The pulse transformer contains a number of tiny isolation transformers (typically four) that completely isolates (galvanic) the Ethernet transceiver circuitry from the UTP cable. Each LAN card is equipped with a pulse transformer module which is usually installed very close to the actual RJ-45 port. You'll need an old Ethernet LAN card (10/100 will do). Improve Your Soundcard's S/PDIF Output - All Here's a very interesting recipe to improve your digital coax cable by providing galvanic isolation between the source and destination by inserting an isolation transformer in the cable itself. This is not analog interconnect but SPDIF coax is still an interconnect so I thought I'll add it here.
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