1541 passiv I/V idea & 1541 S1 found, no A ! - diyAudio
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Old 7th April 2004, 06:21 PM   #1
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Talking 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
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Old 7th April 2004, 07:14 PM   #2
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Talking Ripped off the board and plugged in

Sounds nice.
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File Type: jpg 1541s1.jpg (95.0 KB, 374 views)
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Old 7th April 2004, 08:15 PM   #3
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What is the difference between TDA1541A and without A?
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Here's looking at you, kid.
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Old 7th April 2004, 08:42 PM   #4
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A is newer version.
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Old 8th April 2004, 04:57 PM   #5
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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!!!
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Old 9th April 2004, 08:44 AM   #6
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What does that HHH mean ? My other S1 are HBH.
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Old 9th April 2004, 09:18 AM   #7
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Maybe it indicates where they were produced.

Mine are HSH
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