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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 25th October 2016, 10:56 AM   #771
keantoken is online now keantoken  United States
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L1 is to improve the frequency behavior, not for filtering.

The Nazar is for if you want high PSRR, shunt regulation and have not had good results with super-low output impedance.
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The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
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Old 25th October 2016, 04:47 PM   #772
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
I will check the connections again to make I have everything wired correctly and measure the ACV on the inputs and output.

The layout of the chassis is not the most optimal so I used a shielded cable from the power inlet to the switch.

I will try the buffer without any inputs to see if that makes a difference. I had my DAC, phono preamp, and TV connected. The phono preamp has not been powered on. I will connect the buffer with no inputs and see if anything changes. The switch is a 3T4P, so signal and grounds remain isolated from each other.

I think that I will just move the PS into a different chassis, but before I do that I will remove the PS and use batteries to see what happens.

Does a

It's just a matter of finding the time to make the changes.
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Old 25th October 2016, 06:01 PM   #773
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
BRN, if you had a disconnected signal ground somewhere it could cause this as well; continuity checks are easy.
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Old 25th October 2016, 07:12 PM   #774
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Quote:
Originally Posted by Destroyer OS View Post
BRN, if you had a disconnected signal ground somewhere it could cause this as well; continuity checks are easy.
I will do that again. Not sure if I checked from the buffer to the output RCAs, but I did check the inputs.
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Old 25th October 2016, 08:26 PM   #775
Project16 is offline Project16  France
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Quote:
Originally Posted by BRN View Post
Finally put together my my Kuartlotron buffer. I fired it up and the LED came on and there was no smoke. I ran through the adjustments with no problem. I built the buff in an ebay aluminum chassis that has internal measurements of W 9-5/8" x H 2-1/8" x D 6-7/8" with three inputs.

eBay link:Silver 2606A Full aluminum preamp chassis Power amp box /DIY case | eBay

I'm using RJM Audio's X-reg with the recommended toroidal power transformer to power the buffer in the same chassis.

When I turn my stereo on I get humming through both speakers. It is not real loud, but can be heard from the listening position. The strangest thing is when I turn the buffer off and leave the Folsom TDA7297 amp powered on I get a loud hum and on the second input I'm picking up a radio station.

I'm pretty sure that the transformer is the culprit, but not sure what I want to try in order to fix the problem. I can get some MuMetal to isolate the power supply or I can move the power supply into a different chassis. If I move anything into a different chassis it would most likely be the transformer and regulators. I would leave the X-reg with the Kuartlotron buffer.

If anyone has any other suggestions or thought on this problem I'm open to ideas to fix the problem.

Thanks,
Brad
Hello

Not clear that here come from here but we will say that the cards are supplied with a one after the other. I think they should be fed separately.
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Old 25th October 2016, 09:45 PM   #776
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Project16,

You are correct. I wired one board and connected the power to the other board from the first. I can try and wire both boards directly from the power supply.

Brad
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Old 25th October 2016, 09:52 PM   #777
carlmart is offline carlmart  Brazil
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Can you draw a design on how your grounds are distributed?
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Old 26th October 2016, 02:29 AM   #778
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
I checked the connections and everything checks out.

The ACV on the inputs and output measure 0.006.
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Old 27th October 2016, 12:38 AM   #779
BRN is offline BRN  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
I'm sure my issue is due to the transformer location. It is not bad and it is not audible from the listening position. I'm going to try isolating the transformer with MuMetal and see if that eliminates the hum. I may try moving the transformer to see what affected it has.

I'm listening now and my analog setup has never sounded better.
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Old 27th October 2016, 01:41 AM   #780
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Maybe just turn it verticle ?
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