Allegro preamplifier by Dr. Borivoje Jagodic - diyAudio
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Old 23rd August 2006, 08:02 AM   #1
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Join Date: Jun 2005
Location: Belgrade, Serbia
Thumbs up Allegro preamplifier by Dr. Borivoje Jagodic

Hello everybody!
I am writing this to contribute and inform DIY community about another
design by Dr. Bora Jagodic.It is about his preamplifier design named
"Allegro" that has been built and tested by me. This days I've finished preamplifier Allegro according
to schematics from Borivoje Jagodic. You can find that schematic on his
site: http://bas.elitesecurity.org/mojiprojekti1.html

Here is how it looks today:
http://www.hifi.co.yu/forum/files/im000637_582.jpg
http://www.hifi.co.yu/forum/files/im000639_107.jpg
http://www.hifi.co.yu/forum/files/im000641_212.jpg
http://www.hifi.co.yu/forum/files/im000645_197.jpg
http://www.hifi.co.yu/forum/files/im000647_213.jpg
http://www.hifi.co.yu/forum/files/im000654_132.jpg
http://www.hifi.co.yu/forum/files/im000656_288.jpg

> Frequencies
DIRECT mode-----no limit
BYPASS mode----10Hz-108KHz ( -1dB)
TONE mode ------14Hz-87.5KHz (1dB; control "flat")
> THD (20KHz 1V rms output)
DIRECT mode---- not measured
BYPASS mode----<0.002%
TONE mode ------<0.0026%
> TONE CONTROL
BAS----------------12dB on 50Hz
TREBLE----------- 12dB on 10KHz
> S/N
DIRECT mode------ not measured
BYPASS mode------105dB
TONE mode --------100dB (or best)

Thank's Bora
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Old 25th August 2006, 12:26 PM   #2
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Join Date: Oct 2003
Location: middle of nowhere...
Default o.k.........

sooo....what about the sound; why didn't You use a better cable for the output from the preamplifier; why didn't You use better potentiometer......
what is the rest of the system in where it is playing.......


i was allways interested in NExxxx but never built some.....
regards
daniel, osijek
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