Dear Forum Members!
I found an active cable solution recommended for connecting instruments.
I think the cable inhibits high frequency attenuation.
Is that so?
How do you do it?
Is it recommended for good quality connection of audio devices, cheap?
I tried to show how the cable shielding capacity cuts higher frequencies ...
Thank you for your answers!
I found an active cable solution recommended for connecting instruments.
I think the cable inhibits high frequency attenuation.
Is that so?
How do you do it?
Is it recommended for good quality connection of audio devices, cheap?
I tried to show how the cable shielding capacity cuts higher frequencies ...
Thank you for your answers!
Attachments
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This is a real problem at radio frequencies(up in the mhz range) but any cable that rolls off high frequencies in the audio spectrum is very poorly designed or grossly undersized. Just buy quality cables and this won't be an issue.
The circuit works by driving the shield of the cable with the same signal voltage as is applied to in the inner conductor.
The shield is ungrounded and relies on the low output impedance of the opamp for its effectiveness. By driving the shield with the same voltage as the wanted signal there is in effect no voltage differential between the two and hence the capacitance between the shield and inner conductor can now cause no HF loss... in theory 😉
The shield is ungrounded and relies on the low output impedance of the opamp for its effectiveness. By driving the shield with the same voltage as the wanted signal there is in effect no voltage differential between the two and hence the capacitance between the shield and inner conductor can now cause no HF loss... in theory 😉
Sorry!
What characteristics of a good cable should I pay attention to? In addition to the price ...
What characteristics of a good cable should I pay attention to? In addition to the price ...
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Translated:
You should look at this as well 😉
RULES
6. Posting in a language other than English without a translation.
I thought it would happen that way, but technically I couldn’t deduce it. 🙁
After all, an experiment doesn’t cost much, you can even measure transmission changes, if any.
The opamp is shown running off single rail which makes it all a little harder to grasp. The input signal is applied to the opamp which is configured as a unity gain buffer. The opamp output then drives the shield.
The power supply needs to be floating in this example (such as a 9 volt battery) because you can not connect the opamp negative to the signal zero volt line.
I first came across this technique many many years ago in Elektor magazine as I recall.
The power supply needs to be floating in this example (such as a 9 volt battery) because you can not connect the opamp negative to the signal zero volt line.
I first came across this technique many many years ago in Elektor magazine as I recall.
Glad you see the light now.
Btw, this schematic you posted insures that external interference is getting into the audio path.
Do a search for 'driven shield'.
It's sometimes used for small signal instrumentation in high electrical noise industrial applications.
It's sometimes used for small signal instrumentation in high electrical noise industrial applications.
Called active guard circuit. It removes the effect of the cable capacitance, if the shield driver is able to (i.e. follow the input signal).
Well, he's so ready.
I'm trying to bargain.
How much can they let go of half? 😱
Maybe you should still try a home product? 🙄
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EMT did driven shield phono cables on their broadcast turntables. If you need this in a domestic environment you have bigger problems at home!
Yes Neumann have this module too in some riaa units.
Like members said before, key words are:
Guard shield
drive guard
etc
🙂
Maybe to employ professional sex worker for 7000EU.
Like members said before, key words are:
Guard shield
drive guard
etc
🙂
Maybe to employ professional sex worker for 7000EU.