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The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 9th August 2016, 06:02 PM   #641
lydlaug is offline lydlaug  Norway
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The Kuartlotron - keantoken's simple error-correction superbuffer
Hi, keantoken.
Just a quick question about the new layout you are working on.
What is the purpose of the new PCB? To make it more applicable or will it improve the audible performance?
I have the board supplied from Dirt Cheap Dirty Boards. Will there be any improvements in your opinion to go with the new layout?

reg
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Old 9th August 2016, 06:10 PM   #642
keantoken is offline keantoken  United States
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The new PCB will be more functional, but sound quality won't be any different. The first one has some errors, and I've gotten a bit better at PCB layout since then. I'm nearly out of PCBs, so it's only natural to make some updates. In short, the PCB is changing because I'm changing.
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Last edited by keantoken; 9th August 2016 at 06:24 PM.
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Old 9th August 2016, 06:30 PM   #643
lydlaug is offline lydlaug  Norway
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The Kuartlotron - keantoken's simple error-correction superbuffer
Do that mean that there is some errors on the PCBs from DCDB?
Could you then please point me to the post where it is corrected?

Thanks!
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Old 9th August 2016, 06:43 PM   #644
keantoken is offline keantoken  United States
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Here is a PCB with side trimmers for stacked setups, enlarged via rings for better soldering, and a hunky RN60D on the input for scale. Imagine if I tried to make all the resistors that big.
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File Type: png Kuartlotron-PCB-R2-preview2.png (41.5 KB, 435 views)
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Old 9th August 2016, 06:48 PM   #645
keantoken is offline keantoken  United States
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Quote:
Originally Posted by lydlaug View Post
Do that mean that there is some errors on the PCBs from DCDB?
Could you then please point me to the post where it is corrected?

Thanks!
I'm not sure what that is. But, here so far is the pertinent build information for the the first set of PCBs I designed:


Important info for Kuartlotron PCBs!

1: The boards need a +-10V PSU, do not use more. For trimming you want a regulated supply, but you can still use a simple PSU if the ripple is under 20mV or so.

2: Each board is one channel, so you need a pair for stereo.

3: Some quick notes on construction:
a: Component values are shown on the PCB.
b: It accepts screw terminal inputs and outputs and M3 standoffs.
c: Transistors on left are BC560C (PNP), Transistors on right are BC550C (NPN). Heatshrink or glue the transistors face to face.
d: Use either an inductor, or bridge the solder link in the upper right to use the PCB inductor.
e: Set the trimmers to the values shown on the PCB before soldering them, or just use resistors of those values in the outer vias.
f: Place the screw on the trimmers over screw on the silkscreen. Otherwise the turning direction will be reversed.

4: Customizations:
a: Input resistance is normally 100k. You can use 10k if you want.
b: Output impedance is set to 47R for driving cables to reduce reflections. If you want lower output impedance you can use 4.7R in place of the 47R resistor.

Setup procedure:
1: Each trimmer should be set to the value indicated on the PCB. This can be done before soldering them.
2: Short the input and adjust R5 so that TP reads half of V+ (5V).
3: Remove short from the input and then adjust the DC trimmer so that input voltage reads 0.
Output offset should now be within 5mV. This generally results from small variances in components and won't reduce performance.

Errata:

The connection between the 270R and 15pF capacitor must be made off the PCB. Those vias are mistakenly grounded, which generally causes reduced volume and low input impedance. If you have already soldered the boards, you can clip the leads where they go into the board, lift them up and solder them back together above the board.

Sorry for the mistake. I did not discover the error because it did not cause any obvious faults.
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Need something built, repaired or modded? PM me and ask what I can do!

Last edited by keantoken; 9th August 2016 at 06:51 PM.
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Old 10th August 2016, 02:55 PM   #646
Hearinspace is offline Hearinspace  Canada
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The Kuartlotron - keantoken's simple error-correction superbuffer
Looking through drawers to see what parts I can use for a power supply. What's the steady state current consumption of the circuit on the webpage? (Please forgive if already posted somewhere but I didn't see it.)
Thanks
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Old 10th August 2016, 03:47 PM   #647
gabanyayaya is offline gabanyayaya  Malaysia
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Quote:
Originally Posted by keantoken View Post
My boards stack, so just add some standoffs, rather than drilling holes.

BOM

Here is the BOM. Some people want to use special resistors, so it has Vishay 1/8W metal film resistors which should fit on this PCB.

you should remove the .txt extension for the excel file. Opening the excel in notepad is a mess just in case if someone unaware !
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Old 10th August 2016, 07:17 PM   #648
Hearinspace is offline Hearinspace  Canada
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The Kuartlotron - keantoken's simple error-correction superbuffer
Thanks!
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Old 10th August 2016, 07:55 PM   #649
keantoken is offline keantoken  United States
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DIYaudio won't accept .xls files.

Quote:
Originally Posted by Hearinspace View Post
Looking through drawers to see what parts I can use for a power supply. What's the steady state current consumption of the circuit on the webpage? (Please forgive if already posted somewhere but I didn't see it.)
Thanks
About 16-17mA, can be more or less.
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Old 10th August 2016, 09:57 PM   #650
Hearinspace is offline Hearinspace  Canada
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The Kuartlotron - keantoken's simple error-correction superbuffer
OK, thanks again!
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