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Old 6th November 2006, 01:59 PM   #1
fosforo is offline fosforo  Italy
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Question Help me troubleshooting amplifier module

Hi to all,

some time ago i purchased two subwoofer amplifiers made from the italian RCF. They came from model RCF 600AS.
Yesterday, after a couple of week, i've powerd them.
First of all they works. Second, obviously, they have some probles...
The first one has got the controller board wich has balanced input and outputs, the second one no.
I've connected a cd player to the firs one powering a 12" woofer also from RCF.
Here is the first problem,i've found that the output is quite distorted, even at low levels. (The woofer is in perfect working conditions).
So i tried the second one. As i have said before, this one is without controller board, so i used the one from the first module.
This one is working but even with no signal there is an udible hiss coming out from the speaker. It seems that the filter is not working.
So, here's the questions:

1) anyone could help me troubleshooting the amps? (i can rent an oscilloscope from a friend if it is usefull)

2) I would like to remove the active filter to use an external one, is it possible?

Here's the schematics


Thank you

F.
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Old 6th November 2006, 02:01 PM   #2
fosforo is offline fosforo  Italy
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Old 6th November 2006, 02:03 PM   #3
fosforo is offline fosforo  Italy
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Quote:
Originally posted by fosforo
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Old 6th November 2006, 02:05 PM   #4
fosforo is offline fosforo  Italy
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Quote:
Originally posted by fosforo

Last one
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Old 6th November 2006, 06:18 PM   #5
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Default Fósforo was great Leggionari!


Wonderfull name....i will copy your great idea....i will be fosfori ex in another forum...the X will be used to be recognized by old folks.

Congratulazione fratello Romani...molto buona denominazione.
Bienvenutto al mio core.

Congratulations brother...very good name you choice.

regards,

Carlos
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Old 7th November 2006, 08:00 AM   #6
fosforo is offline fosforo  Italy
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Thank you!
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Old 7th November 2006, 08:34 AM   #7
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What a bizarre design! The driver/gain stage runs 40 volts higher than the output stage - bit excessive, and they regulate the output stage but not the driver/gain stage (which would better benefit from the regulation I think).
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Old 7th November 2006, 08:42 AM   #8
fosforo is offline fosforo  Italy
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Quote:
Originally posted by richie00boy
What a bizarre design! The driver/gain stage runs 40 volts higher than the output stage - bit excessive, and they regulate the output stage but not the driver/gain stage (which would better benefit from the regulation I think).

Maybe it could be, i'm not so skilled to notice that

Any advice on the problems that i have posted?

Thank you

Fabio
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Old 7th November 2006, 08:49 AM   #9
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Hi Fosforo,

Your amp could be modified, but the Schematic of amp section a little bit wrong as it doesnot have Resistors to bootstrap the Step drivers gate , the resistor should have to be there, unless your amp doesnot work, or they might be a mistake in schematic alone....
Your amp is Class-G 2 Tier....

regards,
K a n w a r
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Old 7th November 2006, 08:52 AM   #10
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Quote:
Originally posted by richie00boy
What a bizarre design! The driver/gain stage runs 40 volts higher than the output stage - bit excessive, and they regulate the output stage but not the driver/gain stage (which would better benefit from the regulation I think).

Ritchie have a look at the amp...its class-G not Class-AB ....The mosfets are Linear Envelope follower for Step Voltage.....not a regulator

The Design is alright , only you have misunderstood it....
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