Preamplifier from German magazine Klang&Ton - diyAudio
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Old 5th February 2004, 08:05 PM   #1
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Default Preamplifier from German magazine Klang&Ton

Some time ago, Klang&Ton - German DIY speaker magazine-published a "top end" preamplifier which has an output impedance close to 0, so it should drive any cable any time.

input Z : 10 kohm
output Z : <1 ohm
signal to noise ratio : >100 dB
slew rate 9V /us
Rise falltime: <1,5 us
max output voltage : >8 V eff

What is your opinion about this preamplifier schematic??
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File Type: zip shema2.zip (65.3 KB, 675 views)
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Old 5th February 2004, 11:18 PM   #2
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Can you bring up the picture with better quality?
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Old 6th February 2004, 05:16 AM   #3
Electrons are yellow and more is better!
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If the opamps are OPA134, OPA627, AD8610, LT1028 etc etc. I think it looks quite alright but can you get more info about the parts?
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Old 6th February 2004, 05:54 AM   #4
Werner is offline Werner  Europe
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From what I can make from that schematic there is an almost total lack of care for the power supply.
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Old 6th February 2004, 06:33 AM   #5
Electrons are yellow and more is better!
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The PS could be more serious maybe. The last thing, is it a power amp or is it only a buffer? Hard to see at the schematics.
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Old 6th February 2004, 04:03 PM   #6
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Sorry about quality, because original circuit in pdf format is over 1,5 M and I could not post it here.Maybe try it with 500× zoom in Word.

This preamplifier has two stages. First is op 5532 and second is a "small amplifier" with bd 139/140 output transistors. Power supply is made with 7815/7915 regulators.

Maybe has anybody idea how to convert a large pdf file into something small indeed?
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Old 6th November 2004, 04:12 PM   #7
arasuk is offline arasuk  India
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Cool preamplifier!!!!

hi,

could you post me the full Schematic of the preamplifier.

arasukumar@yahoo.com

thanks
arasuk
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Old 6th November 2004, 06:50 PM   #8
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Quote:
Originally posted by supernet
Sorry about quality, because original circuit in pdf format is over 1,5 M and I could not post it here.Maybe try it with 500× zoom in Word.
Maybe has anybody idea how to convert a large pdf file into something small indeed?
Hi supernet,
Probably a zipped Postscript file will be legible given the forum's restrictions of 800x 1200 Pixels and a maximum file size of 102400KB.
You could try Adobe Phoptoshop converting to GIF and/or resize resample with Irfanview.
Oops, I just see that Photoshop can also resize (just have it 15 minutes on my PC)

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Old 6th November 2004, 07:24 PM   #9
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Default Cacilda Elso, Dear Elso.... are you sure?

It was 800 by 600!

Can we use 800 by 1200

Cacilda Elso!..... Regards Elso


Carlos
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Old 6th November 2004, 07:36 PM   #10
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Default Re: Cacilda Elso, Dear Elso.... are you sure?

Quote:
Originally posted by destroyer X
It was 800 by 600!

Can we use 800 by 1200

Cacilda Elso!..... Regards Elso


Carlos
Hi Carlos, The zipfile was 66kB.
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