TPS7A4001 vs Salas shunt Reg

[Rudi_Ratlos]

@ K i n g P i n: I have received a couple of the PCBs, shown in image 1, some days ago.
The results that you have published, look very promising !

But: I will never be able to solder the TPS7A470x - regulator in its QFN package. I do not have the means to do this!

I do not dare to ask Ales (mravlca) to solder the TPS7A470x on the few couple of PCBs that I have, since I do not want to compete with his offers in this forum, ebay, ...
Ales: be sure that I will not offer the shown PCB in this forum!

But, to go on with my own needs: I did a nice (?) layout of a symmetric LT1763 - LDO - regulator (image2) and wonder , if it will do a nice job as well!

Best regards - Rudi_Ratlos

P.S.: @ K i n g P i n: I have just sent you a PM.

P.P.S.: I did not notice until now:K I N G P I N: you are using Ales' PCBs!

 

[mravlca]

Hi Rudi,

more competiton means better products and so on. I don't mind soldering you the TPS7A4700 chips on your PCBs, but you'll have to wait until september as I am leaving on monday on holiday.

Best Regards,
Aleš

 

[Rudi_Ratlos]

Ales: thank you very much for your kind offer! I will take it - for a very few PCBs only.

As you know, I am not able to "measure" the performance of the PSUs that I have, but maybe that I will "hear" some differences.
From left to right, see images below:

1) SALAS Shunt Reg
2) TPS7A4700 based PSU
3) LT1763 based PSU

I will connect the TPS7A4700- and the LT1763 - PSUs to SALAS' "Hypnotize Pass-B1-Buffer and will tell you (compare) the differences that I hear (if any).

But this will of course take some time!

Best regards - Rudi_Ratlos

 

[TransmissionAquitain]

I mentioned before getting a meter which also functions as an oscilloscope pre-amp. It's arrived, and I investigated it a bit to see how well it works. I've posted a little report about it here:

A Little Look at a Cheap AC Millivoltmeter

 

[Calvin]

Hi,

don´t like humming monster bees 😛

jauu
Calvin

 

[Filippowich]

very interesting topic, but she has a very sad ending, I cried

 

[rhythmsandy]

Ales: thank you very much for your kind offer! I will take it - for a very few PCBs only.

As you know, I am not able to "measure" the performance of the PSUs that I have, but maybe that I will "hear" some differences.
From left to right, see images below:

1) SALAS Shunt Reg
2) TPS7A4700 based PSU
3) LT1763 based PSU

I will connect the TPS7A4700- and the LT1763 - PSUs to SALAS' "Hypnotize Pass-B1-Buffer and will tell you (compare) the differences that I hear (if any).

But this will of course take some time!

Best regards - Rudi_Ratlos

so any updates we are very eager on the results on aural comparison.

 

[Filippowich]

rhythmsandy
It's no use ... Look at the date, no one here is almost half a year. It seems that then Rudi_Ratlos [/ B] went wrong ... He finished 20th August 2015 the assembly of test specimens and even managed to put pictures ... I wonder which of the samples happened to him this misfortune? But as the other participants in the conversation, I was hooked speculated
Sorry for my bad english

 

[Rudi_Ratlos]

rhythmsandy: I am sorry that I did post the result of my comparision.

I have indeed tested the Pass B1-buffer being operated from 3 different PSUs:

- from a SALAS shunt regulator on his "simplistic B1-buffer" PCB
- from a dual LT1763 PSU operating my RPRE - B1-buffer (image 1)
- from a dual TPS7A4700 PSU operating my RPRE - B1-buffer (image 2)

Even though the output of the SALAS buffer looked very good on the oscilloscope, I was not able to listen to it, because my setup is producing a much too big volume.
It is not able to play quietly. This is of course a problem that I have caused myself, but I did not yet find the solution for it.

Concerning the LT1763 vs. TPS7A4700: both PSU regulators produce a very low ripple current (30-40µV vs. <10µV) and have an excellent load and line regulation.
I do not "hear" any difference.
But since the TPS7A4700 is near to impossible to solder, I will stick to the dual LT1763 version.

Best regards - Rudi_Ratlos

 

[Filippowich]

rhythmsandy: I am sorry that I did post the result of my comparision.

I have indeed tested the Pass B1-buffer being operated from 3 different PSUs:

- from a SALAS shunt regulator on his "simplistic B1-buffer" PCB
- from a dual LT1763 PSU operating my RPRE - B1-buffer (image 1)
- from a dual TPS7A4700 PSU operating my RPRE - B1-buffer (image 2)

Even though the output of the SALAS buffer looked very good on the oscilloscope, I was not able to listen to it, because my setup is producing a much too big volume.
It is not able to play quietly. This is of course a problem that I have caused myself, but I did not yet find the solution for it.

Concerning the LT1763 vs. TPS7A4700: both PSU regulators produce a very low ripple current (30-40µV vs. <10µV) and have an excellent load and line regulation.
I do not "hear" any difference.
But since the TPS7A4700 is near to impossible to solder, I will stick to the dual LT1763 version.

Best regards - Rudi_Ratlos

dual LT1763 version what you mean by that?

 

[Rudi_Ratlos]

Fillipowich,

Dual-LT1763-PSU means: putting two LT1763-based PSUs on a single PCB (size of which is 50 x 100mm).

You can either configure the outputs as two separate +VDC outputs or - by putting a cap on jumper JP1 in case you are using a transformer with two separate secondaries - you can configure it as +/- VDC outputs.
I - for example - need a +/-10VDC PSU to operate my Pass B1-buffer.

Best regards - Rudi_Ratlos