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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 29th September 2016, 07:55 AM   #731
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by luxury54 View Post
guys I apologize for the stupid question, but where is this buffer reccomended to be placed at best? between the preamp and the final amp? between the analogue source and EQ/preamp?
A Buffer gets added to the output of a stage that is incapable of driving the cables that follow it.
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Old 29th September 2016, 07:57 AM   #732
AndrewT is offline AndrewT  Scotland
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Originally Posted by nikosokey View Post
Also i have a few questions
When we have the need to put a buffer between source and amp?
my source has 0.1Ω output impedance and my amp 100ΚΩ its necessary the buffer?
The source with 0.1Ω output impedance should see a constant load ?
Can i put the pot after the buffer between buffer and amp lets say 10ΚΩ pot?
I have seen a few of your posts stating this 0.1ohm for output impedance.
What kind of output stage does your DAC have?
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Old 29th September 2016, 07:58 AM   #733
keantoken is offline keantoken  United States
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Quote:
Originally Posted by luxury54 View Post
guys I apologize for the stupid question, but where is this buffer reccomended to be placed at best? between the preamp and the final amp? between the analogue source and EQ/preamp?
Engineers would say there is usually no need for a buffer, unless you're driving long cables or you have a high impedance input like a phono cartridge. One good place for it is after the volume control to reduce the source impedance seen by your amp. It can be good to have a few available as a diagnotic tool as well.

Quote:
Originally Posted by nikosokey View Post
Also i have a few questions
When we have the need to put a buffer between source and amp?
my source has 0.1Ω output impedance and my amp 100ΚΩ its necessary the buffer?
The source with 0.1Ω output impedance should see a constant load ?
Can i put the pot after the buffer between buffer and amp lets say 10ΚΩ pot?
With a direct connection there is no technical reason to use a buffer. Since the volume pot can have a high output impedance, it is usually best to put the buffer after the volume pot.
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Old 29th September 2016, 08:02 AM   #734
keantoken is offline keantoken  United States
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Quote:
Originally Posted by AndrewT View Post

Then post696 suggests you add a link to post1. But that has still not been done !
Actually I did right after you posted that. I even updated that link earlier today.
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Old 29th September 2016, 08:06 AM   #735
nikosokey is offline nikosokey  Greece
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Quote:
Originally Posted by AndrewT View Post
I have seen a few of your posts stating this 0.1ohm for output impedance.
What kind of output stage does your DAC have?
Hi Andrew
AK4490 Mirand Discrete..
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Last edited by nikosokey; 29th September 2016 at 08:08 AM.
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Old 29th September 2016, 08:07 AM   #736
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by keantoken View Post
Actually I did right after you posted that. I even updated that link earlier today.
Your link does not work.

Go to post695.
click on the post number and the Browser takes post695 to the top of your screen,
Right click on the post number. Firefox gives the option to Copy Link Location, Click on that.
Paste that into post1
IE offers the option after right click of copy shortcut.
Click on that and then paste into post1.
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Last edited by AndrewT; 29th September 2016 at 08:09 AM.
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Old 29th September 2016, 08:34 AM   #737
tributeaudio is offline tributeaudio  China
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Hi, Are boards available through DIY audio or you. Cheers
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Old 29th September 2016, 09:00 AM   #738
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by nikosokey View Post
Hi Andrew
AK4490 Mirand Discrete..
going to


AK4490 USB Dac with dsd support – Without shield | Mirand Audio - Solidstate designs

does not tell me what kind of output stage is fitted to your DAC.
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Old 29th September 2016, 09:13 AM   #739
nikosokey is offline nikosokey  Greece
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Quote:
Originally Posted by AndrewT View Post
going to


AK4490 USB Dac with dsd support Without shield | Mirand Audio - Solidstate designs

does not tell me what kind of output stage is fitted to your DAC.

AK4490 USB Dac with dsd support – Discrete DIFF/SE shield, PCM Filter setting | Mirand Audio - Solidstate designs
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Old 29th September 2016, 10:08 AM   #740
AndrewT is offline AndrewT  Scotland
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found it:
Quote:
Output stage – Fully discrete differential and single ended

Thin Film resistors 0.1%
PPS capacitors 2%
Discrete SSR relays for muting
6 discrete JFET input opamps running in class A
Now where does it say 0.1ohm output impedance?
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