This is not related to high quality audio (BTW).
In the world of audio engineering we typically see the load impedance about 10 or more times the source impedance. That's call high impedance bridging, voltage bridging or simply bridging.
Okay, I need to connect the low impedance output of my shortwave radio to line input of my soundcard via an isolating transformer. If the source output impedance is 35 Ohms and the line-in input impedance is 10K, what kind of transformer should I use?
Should it be 600 Ohms 1:1 transformer - or what? Is there a formula involved? Thanks.
In the world of audio engineering we typically see the load impedance about 10 or more times the source impedance. That's call high impedance bridging, voltage bridging or simply bridging.
Okay, I need to connect the low impedance output of my shortwave radio to line input of my soundcard via an isolating transformer. If the source output impedance is 35 Ohms and the line-in input impedance is 10K, what kind of transformer should I use?
Should it be 600 Ohms 1:1 transformer - or what? Is there a formula involved? Thanks.
35r Zout will feed a 10k Zin.
Why do you want or need a transformer?
When I plug the cable from the (portable) radio (plugged into mains) into the PC soundcard line-in, I'm getting a lot of hash/noise. So, I believe I need to get some isolation between the radio and my PC. Often done I believe, but just curious about the transformer.
If you're getting adequate volume "straight in", the a 1:1 transformer will be just right. "600 to 600 Ohms" is a good choice.
All good fortune,
Chris
All good fortune,
Chris
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