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Old 18th January 2005, 01:25 AM   #1
troystg is offline troystg  United States
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Default Reverse engineering a servo controller?

Hi All-

I have an "Erath Electronic Suspension Loudspeaker Controller" which I have decided to install in an enclosure with the woofer amp.

The controller consists of a 2-way 24db electronic cross-over @ 125Hz and then the "servo or feedback" circuitry.

In the process of pulling the PCB out of the original enclosure I figured I would try to reengineer the PCB to miniaturize it as much as possible.

The circuit is still covered under US patent so outside of making a "personal use" copy cloning it is not an option.

I will attach several pictures if anyone has free time to assist me with the deconstruction and rebuilding.. We have the technology, we can rebuild it stronger, faster and better...
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Old 18th January 2005, 01:28 AM   #2
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Old 18th January 2005, 01:28 AM   #3
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Holy mazolie! The name LWE really gets the nostalgia flowing. They did one of the first "super" speakers back in the '60s. Haven't heard that name in 35 years, at least.

How old is that unit?
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Old 18th January 2005, 01:29 AM   #4
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Old 18th January 2005, 01:33 AM   #5
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Quote:
Originally posted by SY
Holy mazolie! The name LWE really gets the nostalgia flowing. They did one of the first "super" speakers back in the '60s. Haven't heard that name in 35 years, at least.

How old is that unit?

The unit is around 4 yrs old..

Mr. Erath is still alive and kicking in Abbeville and Mr. Gerald is still selling his stuff.

Mr. Erath has come out with a few new products but they are still based on "his" production capabilities and that is why I am looking into redoing/shrinking the circuits... Look at the traces on the PCB... That is a 4-5 yr old board!!
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Old 18th January 2005, 01:34 AM   #6
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Old 18th January 2005, 01:36 AM   #7
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Old 18th January 2005, 01:37 AM   #8
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Old 18th January 2005, 01:38 AM   #9
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And lucky # 7

The device compares the input of the woofer amp to the output of the woofer amp and makes adjustments accordingly. It also compensates for the woofer being in an enclosure that resonates at 70(!) Hz.

That's right, I have a stereo pair of 15" woofers each in a 1.25 cu ft box that are flat from 20 Hz up to and cross over at 125hz.
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Old 18th January 2005, 04:27 AM   #10
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Those small silver caps look nice...
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