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

[Bernhard]

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]

Ripped off the board and plugged in

Sounds nice.

 

[Marlowe]

What is the difference between TDA1541A and without A?

 

[Bernhard]

A is newer version.

 

[Tubeee]

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]

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

 

[Bricolo]

Maybe it indicates where they were produced.

Mine are HSH