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Old 17th February 2006, 03:11 PM   #1
profuse is offline profuse  United States
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Default amp design plan use by multiple companies?

amp design plan use by multiple companies?

is it normal practice for a company to go and buy design from another company or designers? if so, what are the ups and downs when buyin the plan?

what does it say about a company that utilizes a same plan that another company use?

what are some some big names out there that borrow another company's design or plan?
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Old 17th February 2006, 08:26 PM   #2
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Using a proven design can save lots of money on R&D.

There are some companies that are run by people who are engineers/designers like Robert Zeff (now head of ARC audio I think -- used to design for Zapco) who take pride in their designs. There are companies run simply to make money. If you're in it for financial gain alone, you likely don't care what's under the cover as long as it's reasonably reliable and has sound quality good enough for the average consumer.

There are a lot of amps that have the class D 'engine' that use the chips re-marked B52 and F16 (the original markings are sanded off). For the most part, you can use the schematic for one to work on the others. Here is a list of a few of the manufacturers who now or at one time used a generic class D audio section:

JBL
Kicker (not marked B52/F16 but use the same parts)
Crossfire
Memphis
Directed
Cadence
Majestic (before it went under)
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Old 18th February 2006, 03:31 AM   #3
profuse is offline profuse  United States
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what are B52 and F16?

how do yall remember what chips are which by looking at the model #?

thanks for ur expertise.
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Old 18th February 2006, 04:13 AM   #4
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B52 and F16 are aircraft. I guess someone was trying to be funny when they picked the code numbers for the chips.

They also used to use another aircraft designation for the large driver IC used in some amps (HIP4080AIP). I think they used A10 but I don't remember for sure.

Those defaced/re-marked ICs are rare. Most ICs are clearly labeled so there's not much to remember.
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Old 22nd August 2007, 08:48 PM   #5
genes66 is offline genes66  United States
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Default zapco ag 350 car amp

I have a zapco ag 350 car amplifier that will not power up. So i opened the chasis no sign of short or over heating and it does not blow the fuse either seems to be a power supply problem can anyone tell me what i need to do to troubleshoot this problem and has anybody else had this problem? thanks!!!!!!!!!!
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Old 22nd August 2007, 10:11 PM   #6
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Here's a link that says this Hifonics Brutus amp has the same board as 5 others listed. The average Joe just doesn't know what he's getting.

http://ampguts.realmofexcursion.com/...rutus_BX2200D/
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Old 23rd August 2007, 02:42 AM   #7
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F-16 is a divide by 16 CMOS chip
B-52 is a very high speed op-amp (typically National Semi device)

I will post JBL direct part numbers later


Most Class D and Class AB amps are built generically by offshore companies, all you need do is spec a case and cosmetics and they supply the Amp-guts of their choice and VIOLA!!! your a Amp company with a sales office and a gigantic staff of maybe 5 to 6 employees, selling millions of dollars worth of $38.00 amplifiers made overseas.

This the current business model of many companies. Warranty and product support are covered by direct replacement using rejected and repaired <offshore> B stock with a new box and paperwork so you think they actually gave you a completely "New" replacement amp.

The typical $38.00 amp sells here for over $600.00 PLUS. So at the cost they actually paid they could actually afford to replace your broken new amp several times without even breaking a sweat.

Blame all this on $2,500.00 a year salary labor rates for Lab level employees in Asia.


And people got upset over sweat shop labor making clothes lol lol lol If they only knew their big screen was made the same way as their clothes and many other things your now buy from Chinese factories
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Old 23rd August 2007, 05:23 AM   #8
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F-16 is a 14 stage counter listed as a MC14060

B-52 is a LM-361 very high slew rate Op-amp by National Semi


The reason for coding these parts is so untrained and unauthorized personnel will not be able to repair or copy this very fundamental design of a Class D amp.
This used to be done back in the 60's and early 70's by amp builders here in the US so only factory trained people could and would repair these products. Plus any maker of Semi's will custom mark your product with a house code number.
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Old 26th August 2007, 01:07 PM   #9
Pandora is offline Pandora  Canada
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Very few manufacturers actually make their own amps now, especially when it comes to large class D amps. Chunglam Electronics in Korea makes amps for at least a dozen big-name US companies and more in Europe as well. Only a few companies like Rockford and Hifonics make their own amps anymore, and I wouldnt be surprised if those are outsourced to Korea as well.
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Old 26th August 2007, 01:23 PM   #10
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And some JBL Pro model are designed by Elyton, Taiwanese company
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