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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

MOX - active crossover
MOX - active crossover
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Old 1st March 2004, 09:36 AM   #91
promitheus is offline promitheus  Europe
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MOX - active crossover
Thanks for the link.
I will check it.
I donīt know why but only few crossovers have equalisation and the problem is that almost all speakers need it.
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Old 1st March 2004, 09:40 AM   #92
Andypairo is offline Andypairo  Italy
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In my opinion the use of discrete or integrated opamps has to be left to the final user, so the PCBs should be made in order to accept both.

Moamps' approach required a DIL-to-SIL adapter for the integrated opamps, if we want to avoid it a DIP socket could be placed on the "main" PCB leaving the space to mount a discrete OPAMP with a matching pinout in piggy-back.

I slightly favour the SIL approach, since it seems to simplify the overall layout.

Cheers

Andrea
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Old 1st March 2004, 09:45 AM   #93
moamps is offline moamps  Croatia
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Default Re: Opamps

Quote:
Originally posted by JensRasmussen
I do not think that descrete opamps bettet are than some of the IC's you can get, if they were, opamp designers would have made them into a commeciel product many years ago.
Hi,

I don't think so.

This discrete opamp works in class A with small open loop gain. Standard IC opamps work usually in class AB or B with huge open loop gain.

Regards
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Old 1st March 2004, 09:48 AM   #94
promitheus is offline promitheus  Europe
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MOX - active crossover
Hey Jens,
thatīs your work.
Very good.
I am very impressed. Everything uses normal circuits but can be substituted with discrete opamps. what would be interesting would be to make the equalisation also modular. Because someone might not need it or maybe someone needs 2-3 points.
Itīs just an idea.
whatīs the difference between overall equalisation and equalisation after the crossover?
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Old 1st March 2004, 09:54 AM   #95
JensRasmussen is offline JensRasmussen  Denmark
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Default EQ

Hi,

The Global EQ sections are there in case you do not have enough in one of the 4 channels.

I'm working on an adjustble EQ section.

\Jens
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Old 1st March 2004, 09:56 AM   #96
promitheus is offline promitheus  Europe
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thatīs great.
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Old 1st March 2004, 10:31 AM   #97
JensRasmussen is offline JensRasmussen  Denmark
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Default Schematics

The schematics,

The need for gain adjustment on the output has been eleminated.

Sorry for the mess.
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Old 1st March 2004, 10:35 AM   #98
JensRasmussen is offline JensRasmussen  Denmark
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Default Placement of components

Component layout
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Old 1st March 2004, 10:38 AM   #99
promitheus is offline promitheus  Europe
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MOX - active crossover
is it possible to combine resistors and capacitors in parallel ?
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Old 1st March 2004, 10:50 AM   #100
JensRasmussen is offline JensRasmussen  Denmark
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Default Resistors and caps

Hi,

I don't think there is room for more resistors.

why do you want to parallel them?

I hope the room for both HP and LP one one board

\Jens
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