I measured the impedance of the L||R network I use using an HP 4194A impedance analyzer. I used the analyzer to extract the L and R of the network. The measured L and R were within expected component tolerances of the design target values.
In the design documentation I specify the exact same resistor that I used for the impedance measurement. If you follow the design documentation, you'll be successful. If you colour outside the lines a bit, you will likely be successful as well. After all, the practice of putting the resistor inside the inductor has been used for decades with good results.
The performance measurements shown on my website were performed with the board as built according to the Mouser BOM and design documentation.
I do understand your concern. I have seen circuits where the output inductor was wound around a DC coupling capacitor (aluminum can electrolytic). While I don't have data to back up my concern, that approach did not sit well with me. In my case, however, there is very little metal inside the inductor and the amount that's there has been characterized during the design phase of the project.
Tom
In the design documentation I specify the exact same resistor that I used for the impedance measurement. If you follow the design documentation, you'll be successful. If you colour outside the lines a bit, you will likely be successful as well. After all, the practice of putting the resistor inside the inductor has been used for decades with good results.
The performance measurements shown on my website were performed with the board as built according to the Mouser BOM and design documentation.
I do understand your concern. I have seen circuits where the output inductor was wound around a DC coupling capacitor (aluminum can electrolytic). While I don't have data to back up my concern, that approach did not sit well with me. In my case, however, there is very little metal inside the inductor and the amount that's there has been characterized during the design phase of the project.
Tom
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The boards arrived a few days early and the manufacturer included one more board than I ordered (nice folks!). For those who have ordered already: Your boards will be in the mail by tomorrow morning. Regular airmail will arrive in 2-3 weeks (1-2 weeks to the US). Tracked mail tends to be a bit faster.
I have 13 boards left.
Tom
I have 13 boards left.
Tom
I've had the LX521s running for quite a while now, originally built AKSA amplifiers for them. The new amp has 2 x mod-86s 4 x Par-86s and 4 x UCD400s for the LX521s.
Using the Minidsp 2x8 at the moment, but have been working on a Minisharc based dsp and 4 x Buffalo III Dacs, which have perfect differential output for Toms amplifiers and the Hypex UCD modules.
Using the Minidsp 2x8 at the moment, but have been working on a Minisharc based dsp and 4 x Buffalo III Dacs, which have perfect differential output for Toms amplifiers and the Hypex UCD modules.
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