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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Lx-mini Analog Crossover
Lx-mini Analog Crossover
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Old 6th August 2018, 07:03 PM   #11
Nelson Pass is offline Nelson Pass  United States
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Lx-mini Analog Crossover
More directly:

http://www.firstwatt.com/pdf/art_lxmini%20crossover.pdf

The board for this project only supports a 2 pole high pass, as per
the original Linkwitz design.

There is a DIY crossover project in motion which will deliver 1 - 4 pole,
which will appear in the store probably later this year.
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Old 6th August 2018, 07:46 PM   #12
ro9397 is offline ro9397  United States
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My apology Mr. Pass, for mis-typing. I meant stereo (2-ch), 4th order, unbalanced OK.

I prefer ability to select one of multiple frequencies between about 60 -150 Hz, but 70 Hz fixed is Okay.
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Old 7th August 2018, 12:59 AM   #13
Davey is offline Davey  United States
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Quote:
Originally Posted by ro9397 View Post
My apology Mr. Pass, for mis-typing. I meant stereo (2-ch), 4th order, unbalanced OK.

I prefer ability to select one of multiple frequencies between about 60 -150 Hz, but 70 Hz fixed is Okay.
Nelson linked to his paper showing the schematic. What you're asking for is quite a bit different than the toplology implemented.
To get 4th-order you'd have to feed one of the outputs back to the input of the other side, and then replace resistors with capacitors and capacitors with resistors on one side.....among other issues.

You are aware of this, yes???

Dave.
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Old 7th August 2018, 01:28 AM   #14
ro9397 is offline ro9397  United States
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Hi Dave,
Yes, thank you. I read Nelson's paper and now see this curve is specifically for Linkwitz' speaker, different from my needs.

If anyone has suggestion for my application I request a PM to keep this thread on topic.
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Old 7th August 2018, 01:57 AM   #15
Nelson Pass is offline Nelson Pass  United States
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Lx-mini Analog Crossover
If all you want is a stereo 4th order high pass, then you can disable the
low pass and the EQ and loop the output of one filter into the input
of the other, since each of them has 2 poles of high pass, so yes, it does
look like you can do it.

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Old 24th August 2018, 11:16 PM   #16
njepitt is offline njepitt  United Kingdom
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Hi Nelson,

There was a thread a while ago about a "B1 active crossover" where some of us discussed using BF862. (I never had the time to build one.) Would BF862 work well in place of J113 here? They're very low-noise... I presume the biasing resistors would need to be adjusted, although I don't know how. Since the whole circuit is very low-power you could presumably use little adaptor boards like juma used in a thread ages ago and not have trouble with heat.

Alternatively, maybe a little DIP-8 adaptor board could include both jfets and little surface-mount resistors, so the buffers would have the same footprint as an op-amp. (Although this wouldn't fit the PCBs of course...)

Thanks for the fascinating article!
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Old 24th August 2018, 11:53 PM   #17
njepitt is offline njepitt  United Kingdom
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Looks like my question is already answered in another thread.... sorry!
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Old 25th August 2018, 05:12 AM   #18
EUVL is offline EUVL  Europe
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You can use BF862 in a source follower, as long as you keep the voltage low, say ~9V.
Done that before almost 10 years ago :
B1-Turbo on a Chip
Pass B1 pre with BF862

These days I just use 2SK209, as it can stand much higher voltage without gate leakage.


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Old 25th August 2018, 05:23 AM   #19
EUVL is offline EUVL  Europe
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This is the cascoded version which has been built 100's of times, and now copied in multiple commercial products.
Joachim Gerhard Filter Buffer for ES9022


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Old 27th August 2018, 04:32 PM   #20
jmansion is offline jmansion  United Kingdom
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Quote:
Originally Posted by ro9397 View Post
I respectfully request a link to the analog xo. I looked for a long time

If not Mr. Pass's xo, I respectfully request suggestions for the stated application.
Well I looked and found. Look in Articles.
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