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Old 28th April 2011, 07:50 AM   #11
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plz anyone upload circuit schematic of FIDEK FPA G12
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Old 28th April 2011, 08:04 AM   #12
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this amp is service manual some parts list is fake
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Old 30th April 2011, 04:03 AM   #13
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Plz anyone send correct schematic of fidek g12
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Old 30th April 2011, 08:22 AM   #14
wahab is offline wahab  Algeria
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Location: algeria/france
Good schematic, but there s a few misdesigns...

The worse is the use of a MJE340/350 pair as common emitters
part in the cascoded VAS..
It make sense as common base part for the cascodes, although
there s far better devices that suit this purpose.

Also, they use a heavy shunt compensation resulting in a low
slew rate of 40V/uS wich is not really enough for such high
level output...

They use 120V 2SA970/2SC2240 as common base part in the
input differential, and althoug it s enough since they see only 72V
EC voltage in normal functionning, they can t sustain the 144V
rail voltage, wich is not cautious since at power on, there can
be quite different conditions than when voltage have settled...

Other than that, construction is serious...
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Old 30th April 2011, 10:34 AM   #15
Bonsai is offline Bonsai  Europe
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Location: Europe
This is a PA amp. OK for disco. Built like tank.

Having said that, my amp is rated at 280W per channel and does around 500W into 4 Ohms and it weighs 38Kg . . .
Amplifier Design and Construction for MUSIC!

Last edited by Bonsai; 30th April 2011 at 10:36 AM.
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