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-   -   Is this a real TDA1541A? (http://www.diyaudio.com/forums/digital-source/32587-real-tda1541a.html)

pop11 20th April 2004 08:35 AM

Is this a real TDA1541A?
 
2 Attachment(s)
It does not have the "Philips" logo on it, is this real? :bigeyes:

Please help :bawling:

elib 20th April 2004 08:44 AM

2 Attachment(s)
It's at least a remarked one. I assume it's a TDA1541 of 1987.

jean-paul 20th April 2004 08:47 AM

That sure is a remarked one.

pop11 20th April 2004 08:53 AM

So it is a fake? Or just remark of a normal TDA1541A? :bigeyes: :bigeyes: :bigeyes:

Bricolo 20th April 2004 08:58 AM

What do you mean by "remarqued" ?
-a fake chip with 1541 written on it
-a genuine 1541, but with new writing on it (why?)


And it it's solution 2, the marking date becomes the production date? That's odd!

Andypairo 20th April 2004 09:10 AM

Quote:

Originally posted by pop11
So it is a fake? Or just remark of a normal TDA1541A? :bigeyes: :bigeyes: :bigeyes:
Making a fake (working) IC is luckily more complicated than making a fake transistor, IMHO there are 2 possibilities

1- Someone has around a overstock of plain 1541s (the writings are way too similar to Elib's photo of 1541) or inferior specification chips and, seen the great interest on this product, rebrands them as "1541A" with later production code

2- The fab that made the double crowns opened again ;) but without the Philips logo (joke)

To see how good it is (and if it works at all) the only way is to try and compare it with a reguar 1541A. I'm sure that someone has a horny socket ;) ready to be plugged with such a chip.
If you get to make a comparison, please let us know.

Cheers

Andrea

tschrama 20th April 2004 09:30 AM

Hi,

I thought there was another compagny that made TDA1541A chips, as philips alternative, maybe that's what you have?


cya,
Thijs

guido 20th April 2004 09:43 AM

Looking at elib's picture you can see that the taiwan is marked
RSH. Seems the factory code is HSH for holland and RSH for taiwan.

Your chip is HSH-97, but in 1997 they were not produced anymore in holland as far as i know.

So yes, it must be fake.

Try to plug in in a (I2S) player.

If it works without pin4 connected, it's an A version.
If pin4 needs to be connected to get sound, it's non A (output buffer latch).

Also the A version needs the cap on pin 16/17, the non A version
does not need one. The A version should sound crap without cap (dem oscillator not running).

Second source for 1541 would have been Wolfson as far as i can remember. Think they made something similar.

mvg,

Bricolo 20th April 2004 09:55 AM

You'll also notice that the print font isn't the same as the true philips one

hacknet 20th April 2004 09:56 AM

yes i`ve seen tda1541s that look like that they are of the older batches. more than 10 years old i guess.


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