1541 passiv I/V idea & 1541 S1 found, no A !

Bernhard · 7th April 2004, 06:21 PM

Hi,

We know that the 1541 is not happy about voltage swing on it's output.

So it has to be kept low.

My idea:

Take a resistor value that gives 2V for 2mA and connect to a buffer opamp.
Use the output of the opamp as floating ground for the analog and digital ground of the 1541.
The TDA doesn't see the output voltage anymore.

Will this work ?

I found a TDA1541 S1 chip today.

It is not A version and got round Philips logo.
No silvercrown, only S1.

Bernhard

Bernhard · 7th April 2004, 07:14 PM

Sounds nice.

Marlowe · 7th April 2004, 08:15 PM

What is the difference between TDA1541A and without A?

Bernhard · 7th April 2004, 08:42 PM

A is newer version.

Tubeee · 8th April 2004, 04:57 PM

Hello,

Good picture!!!
Please watch closely to the prefix of date code prints "HHH" instead of ordinary "HSH". I found the one with "HHH" (with philips logo) just sounds excellent!!!

Bernhard · 9th April 2004, 08:44 AM

What does that HHH mean ? My other S1 are HBH.

Bricolo · 9th April 2004, 09:18 AM

Maybe it indicates where they were produced.

Mine are HSH

7th April 2004, 06:21 PM	#1
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	1541 passiv I/V idea & 1541 S1 found, no A ! Hi, We know that the 1541 is not happy about voltage swing on it's output. So it has to be kept low. My idea: Take a resistor value that gives 2V for 2mA and connect to a buffer opamp. Use the output of the opamp as floating ground for the analog and digital ground of the 1541. The TDA doesn't see the output voltage anymore. Will this work ? I found a TDA1541 S1 chip today. It is not A version and got round Philips logo. No silvercrown, only S1. Bernhard

7th April 2004, 08:15 PM	#3
Marlowe diyAudio Member Join Date: Feb 2003	What is the difference between TDA1541A and without A? __________________ Here's looking at you, kid.

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7th April 2004, 08:42 PM	#4
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	A is newer version.

8th April 2004, 04:57 PM	#5
Tubeee diyAudio Member Join Date: Jun 2003	Hello, Good picture!!! Please watch closely to the prefix of date code prints "HHH" instead of ordinary "HSH". I found the one with "HHH" (with philips logo) just sounds excellent!!!

9th April 2004, 08:44 AM	#6
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	What does that HHH mean ? My other S1 are HBH.

9th April 2004, 09:18 AM	#7
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Maybe it indicates where they were produced. Mine are HSH

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