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

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 4th June 2018, 02:03 AM   #921
keantoken is offline keantoken  United States
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Is this what you were doing? Notice the bootstrap is taken before the 47R resistor and there is no input shunt resistor (input must be DC coupled). You could also remove the 47R resistor entirely, it is there to help with cables.
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File Type: png Kuartlotron-LP.png (7.2 KB, 371 views)
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Old 4th June 2018, 07:32 AM   #922
patriz is offline patriz
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I used thisl one with a 10k pot at the input.
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Old 4th June 2018, 10:19 AM   #923
Project16 is offline Project16  France
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Hello everyone

After some private message requests for the manufacturing files and Sprint Layout, I decided to make them available for everyone.
On the images the name 'KEANTOKEN' has a small error and it is repaired in the attached files in the archive.

The first version I made and hand made that works perfectly is visible here but I made some small aesthetic and practical changes.
The Kuartlotron - keantoken's simple error-correction superbuffer

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Originally Posted by adason View Post
Interested, if some boards are available.
A small production of 10 printed circuits is launched and I will have two to three pairs available in some time.

Regard's
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File Type: zip Kuartlotron Files.zip (418.5 KB, 43 views)
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Old 4th June 2018, 10:22 AM   #924
keantoken is offline keantoken  United States
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Quote:
Originally Posted by patriz View Post
I used thisl one with a 10k pot at the input.
That is a buffer, not a LP filter. What did you do to make it a LP filter? You may just need to remove the 10k resistor.
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The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
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Old 4th June 2018, 10:36 AM   #925
patriz is offline patriz
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Hi Kean , thank you. Sorry I wasn't clear enough.Your schematic in post 921 it is just what I used in the LP active crossover , except L1 and L2 and 1M shunt input resistor . My question was about the buffer used as preamp with volume control, not the buffers used in the active crossover.
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Old 4th June 2018, 10:41 AM   #926
keantoken is offline keantoken  United States
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Okay. Well that is interesting, since it's the first time I've heard of a problem with the bass. The boards I sell use a 100k input resistor, the original circuit used 10k because some early users wanted to use it DC coupled. If you are using an input capacitor try using 100k instead of 10k.
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The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
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Old 6th June 2018, 01:09 PM   #927
Project16 is offline Project16  France
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Hello everyone

Visibly a small trace poses problem for some manufacturers with the track connected to the ground plane, so I modified the layout to correct this problem.

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File Type: jpg TOP LAYER 1.JPG (115.8 KB, 305 views)
File Type: jpg TOP LAYER 2.JPG (116.5 KB, 293 views)
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File Type: zip Corrected Manufacturing Files.zip (41.3 KB, 38 views)
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Old 13th June 2018, 09:18 AM   #928
silasmellor is offline silasmellor  Denmark
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The Kuartlotron - keantoken's simple error-correction superbuffer
Hey Project16, do you still have boards available for this? How much of an issue is 12V in, or should that be dropped to 10V?
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Old 13th June 2018, 10:44 AM   #929
jameshillj is offline jameshillj  Australia
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I know the pcb design programs are designed for production assembly, not diy and this is a bit late in your design procedure but is it possible to increase the size of the donuts and also the space between the donuts and the surrounding 'planes?

As it is, the small donuts and narrow clearances increase the chances of a 'short' plus when altering components, it's rather difficult to avoid board damage
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Old 6th September 2018, 10:57 AM   #930
PinkPink is offline PinkPink  Hong Kong
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Another happy user of The Kuartlotron here.

Thanks to keantoken for such nice buffer!

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