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-   -   Preamplifier from German magazine Klang&Ton (http://www.diyaudio.com/forums/solid-state/27640-preamplifier-german-magazine-klang-ton.html)

supernet 5th February 2004 08:05 PM

Preamplifier from German magazine Klang&Ton
 
2 Attachment(s)
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??

Cybergent 5th February 2004 11:18 PM

Can you bring up the picture with better quality?

peranders 6th February 2004 05:16 AM

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?

Werner 6th February 2004 05:54 AM

From what I can make from that schematic there is an almost total lack of care for the power supply.

peranders 6th February 2004 06:33 AM

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.

supernet 6th February 2004 04:03 PM

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?

arasuk 6th November 2004 04:12 PM

preamplifier!!!!
 
hi,

could you post me the full Schematic of the preamplifier.

arasukumar@yahoo.com

thanks
arasuk

Elso Kwak 6th November 2004 06:50 PM

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)

:bawling:

destroyer X 6th November 2004 07:24 PM

Cacilda Elso, Dear Elso.... are you sure?
 
It was 800 by 600!

Can we use 800 by 1200

Cacilda Elso!..... Regards Elso


Carlos

Elso Kwak 6th November 2004 07:36 PM

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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