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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 27th March 2014, 06:12 AM   #181
baswamin is offline baswamin  India
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taisho_daniel,

Thank you for pointing this out. I thought I had read it earlier but dint know where. Well, need to read more, thanks anyway.
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Old 2nd April 2014, 03:18 AM   #182
Joachim Gerhard is offline Joachim Gerhard  Germany
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I did not find the time to research why my build needs such a high value cancelation resistor but i solved another problem that bugged me since i build the first version :
Sometimes the buffer works and sometimes not !
No matter what i did : silence !
That really drove me nuts. Two days ago again i could not get any sound out of the buffer although it had worked fine the other day.
On the bench it tapped the TKD pot and here we go : the pot has a mechanical deffect on both channels. I bend the pot a little bit and got it working. Maybe that was the problem that Self found. The TKD seems to be quite delicate and may not like strong misuse like i do sometimes when i test worst case.
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Old 2nd April 2014, 03:20 AM   #183
Joachim Gerhard is offline Joachim Gerhard  Germany
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Well, i do not want to bad mouth TKD. It is a very smooth and precise part, better then the Blue Alps i think and this is the first time i had that problem so it is not typical.
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Old 1st May 2014, 09:46 PM   #184
kp93300 is offline kp93300  Malaysia
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Default Sounds like oscillation

I build one channel with point to point. in fact this is the secong build point to point and both have very similiar problems.
the circuit is from the keantokean blog page as stated in the beginning of the thread.
There is a constant hump that increases with volume and changes when the input leads and volume control are touched.
Power supply is with 2 LM 317. output V is +/- 10V.
Transistors are BC 550 c and 560c. Different brand . R1 , R2 are both 56 R.
Vbe at Q3 is 61Mv. Vbe at Q4 is 68 Mv. Tp measure 5 v after trimming.
Output offset is 6 mv .

Hearing through the humming, the sound is very good and no obvious distortion.

Any suggestions to solve the humming sound.??
Anyway to troubleshoot without analayser. ??
Do i need a gate stopper at Q1?
could be the Inductor --wrong spec ?? . i salvage this from somewhere and is this value critical ?? the previous version is self wound ---15 turns over a AA battery .


I am building this to power a class D amp with an input impedance of about 10 K. This amp has too much gain and hence i have a voltage divider before the volume control. The remote for the volume is bought from ebay .

please excuse for an untidy build.

cheers

kp93300
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Last edited by kp93300; 1st May 2014 at 09:48 PM. Reason: spelling
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Old 2nd May 2014, 12:39 AM   #185
keantoken is offline keantoken  United States
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Can you set the voltmeter to AC and probe across the rails? And then probe across the input and output of the Kuartlotron to see if you can measure the hum directly, so see exactly where it's occurring.
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Old 2nd May 2014, 01:38 AM   #186
kp93300 is offline kp93300  Malaysia
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Quote:
Originally Posted by keantoken View Post
Can you set the voltmeter to AC and probe across the rails? And then probe across the input and output of the Kuartlotron to see if you can measure the hum directly, so see exactly where it's occurring.
thanks keantoken.
i will do that tonight as i am at work now
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Old 2nd May 2014, 02:23 AM   #187
keantoken is offline keantoken  United States
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Don't probe from the input to output, probe from input to ground and output to ground. In case you misunderstood.
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Old 2nd May 2014, 01:28 PM   #188
kp93300 is offline kp93300  Malaysia
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Input to ground--0v ac
outout to ground about 0 v ac
Power supply --Gnd to positive shows 21v ac !!
Power supply -- gnd to negative show 0 v ac.

i am now checking the power supply
thanks keantokean.
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Old 19th March 2015, 02:28 AM   #189
derekr is offline derekr  Barbados
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Am considering trying this as the buffer between a Soekris DAC's unbuffered output - which is 625R and 1.4Vrms - and a Class D amp whose input impedance is 2200R.

Can I use +/-15V or is that too high?
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Old 19th March 2015, 06:53 AM   #190
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by derekr View Post
Can I use +/-15V or is that too high?
There's no audio device that doesn't have an optimal voltage. And that wasn't it.
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