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  #1  
Old 16th March 2004
Entertainment Entertainment is offline
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Default Pioneer datasheet or Pin configuration?

Is there somebody who can help me find a datasheet or the Pin configuration of a Pioneer Power IC?

This is the printing on the circuit:
PIONEER
MOSFET
PAL007A
H22AA0325
Malta

I need this info to be able to help you guys with a pre-out from the AMP1.
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  #2  
Old 16th March 2004
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Saba Saba is offline
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Maybe here, but you have to be a paid up member

http://www.doom.com/
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  #3  
Old 16th March 2004
moz moz is offline
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You could check here

http://fileshare.eshop.bg/index.php?what=search

I'm almost asleep but it may be there, I had that bookmarked for some projects in the past.
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  #4  
Old 16th March 2004
mopo mopo is offline
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. Doom.com - Online Marketplace, Parts Search, Datasheets Search ... - [ Translate this page ]
... PAL005 005. PAL005A PAL005A 005A, PAL006A PAL006A 006A, PAL007A PAL007A
007A, PAL05-C-04 PAL05C04 05C04, PAL094018 PAL094018 094018. PAL1 ...
www.doom.com/d/dm2531.htm - 35k - Cached - Similar pages

thats from google... looks like doom.com has it... who wants to pay?

if you click on the link then press stop on the brower before it redirects you it titled as DOOM.COM Stock And Avaibility List Page DM-2531, and the PAL007A is listed... note pioneer.com told me PAL006A is interchangable with 07A

Pat
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  #5  
Old 16th March 2004
TheKomoman TheKomoman is offline
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Money where are mouths are boys? I'd be happy to PayPal some cash to Jari for him to access the docs he needs for this. Anybody else?
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  #6  
Old 16th March 2004
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May be not needed. I just noticed you can register as a trial user for a week (which I just did). Account needs to be activated to get access. May take a day or two. Give it a go.
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  #7  
Old 16th March 2004
epsilon93 epsilon93 is offline
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There was a picture here sometime ago before the great crash. I think I still have it somewhere. It is not very clear but I believe you can still make out the important bits. I'll post it as soon as I find it.
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Old 16th March 2004
davepa davepa is offline
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Default For what it's worth...

I found a site that claims TDA7385 is the same I.C.
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  #9  
Old 16th March 2004
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I have the datasheet for the TDA7385.
So tonight I will check if it really match the PAL007A. There are markings on AMP1 PCB for the speaker outputs, so if these match then the rest should match also.
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  #10  
Old 16th March 2004
epsilon93 epsilon93 is offline
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I just checked. It's the same!! The TDA7385 can handle 4x35W/4ohm max. There is another better part, TDA7386 which can handle 4x40W/4ohm. davepa, good info!

PAL006A and PAL007A is pin-to-pin compatible. This pic is all I have of the PAL006A diagram I got from someone's posting. Can't remember who.

What does this mean? Can we just do a drop in replacement for a power upgrade? :wink:
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Old 17th March 2004
davepa davepa is offline
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epsilon93

Pin 25 is different,

TDA7385 shows Pin-25 as "Diagnostics" used for Clipping, Overheating & Output Misconnections.

http://www.freeweb.hu/palmester/doc/TDA7385.pdf

TDA7386 shows Pin-25 as "HSD" whatever that is...

http://www.freeweb.hu/palmester/doc/TDA7386.pdf
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  #12  
Old 17th March 2004
epsilon93 epsilon93 is offline
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davepa,

Connection to pin 25 on the TDA7385 is optional. In any case, it is not connected to anything in the EHU.

Pin 25 on the TDA7386 is not used either and is labeled as a no connect on the TDA7386 datasheet. You can see this on this datasheet here.

http://www.st.com/stonline/books/pdf/docs/4057.pdf

So in essence both the TDA7385 and TDA7386 is functionally identical except that the TDA7385 has additional circuitry internally for fault sensing. They both offer the same sort of protection on the output side. I am willing to swap the IC in the EHU if Jari says it is possible to get more output from doing this. I believe the rear parcel shelf 4" speakers would benefit the most from this upgrade. I only have the ES1 150W stereo.
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  #13  
Old 17th March 2004
LinearSLT LinearSLT is offline
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HSD is 'Hardware System Diagnostics' I believe. The only difference between this pin and the one on the other chip is a pull up resistor. Once can probably safely leave these two unmonitored. They are meant for applications where a clipping LED or other such diagnostic is used. Both generate 80W of heat, so no real difference there either.

However, it does amaze me what crap they can put in car audio systems. At the nominal 13V that you get at the EHU, the lower power amp produces 15W at 1% distortion and the higher power one produces 24W at 1%. No self respecting audiophile would tolerate that distortion in a home system. I guess the logic is that the car environment is noisy and you won't notice it.

Either way, the existing system can't effectively produce more than 15W of 'quality' power at each speaker so 24W @1% from the replacement chip is a huge improvement.
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Old 17th March 2004
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Quote:
Originally Posted by LinearSLT
HSD is 'Hardware System Diagnostics' I believe. The only difference between this pin and the one on the other chip is a pull up resistor.
I defer to the experts.

ctrlz
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  #15  
Old 17th March 2004
epsilon93 epsilon93 is offline
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Quote:
Either way, the existing system can't effectively produce more than 15W of 'quality' power at each speaker so 24W @1% from the replacement chip is a huge improvement.
That's exactly what I am thinking! :wink:
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  #16  
Old 17th March 2004
epsilon93 epsilon93 is offline
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Surprisingly, there aren't very many integrated amplifier ic in the market and I am willing to bet that these ics are commonly used in aftermarket HU from Sony, Pioneer etc. They are cheap to use and takes a lot of hassle out of designing the amplifier stage as well as a real space saver. Unfortunately, they are do not offer the best quality sound with THD in the order of 1% at half of the maximum output power.
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Old 17th March 2004
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Default ic amp swap

If the higher power handling chip is a drop-in replacement, what are the other issues? Better heat dissipation, at least, I would think. How about changes to other PCB components?

Sounds too easy.
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  #18  
Old 17th March 2004
davepa davepa is offline
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We need to get the real expert here...

The man with the inside scoop !

Entertainment ?
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  #19  
Old 17th March 2004
LinearSLT LinearSLT is offline
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Reading the DSP chip info, it looks like the DSP1 and DSP2 chips can be controlled by external lines, that normally come from some other buffer chip. If they are anything like the other DSP chips I have used, then there has to be a bypasss mode, where the DSP does no processing. Can't find the document that describes this for the SAA7706H though.

Entertainment, do you know this info ?
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  #20  
Old 17th March 2004
epsilon93 epsilon93 is offline
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It should be that easy. Both chips have almost identical specs. I have even checked the application circuit and they are identical. I am willing to give it a shot if I can get my hands on the chip.

The beauty of this chip is that it requires very few external components. Whatever external components required at the input/control end is already there on the circuit board. That leaves the only remaining issue to deal with is the heatsink. The higher power chip is definitely going to dissipate more heat than the original chip only if you drive the higher power chip harder or near its peak output. I don't believe I'll do that. However, I think I do ocassionally drive the original chip near it's peak output and I can already feel that the amp is straining. If I just have that little bit more power, I believe it'll drive the speakers a little better. Not necessarily better sounding but definitely more oomph. This is so I can put in better speakers to replace the stock ones and not having to worry about finding very sensitive speakers and limiting my choice.

Unless someone here can tell me otherwise, I don't really see any other issues here.

I'll definitely write a report here if I do get my hands on the chip for the mod. I'd probably go look for it when I go to town next time ;-) Anybody else up for this mod?
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