Super regulated power supply

[analog_sa]

From what i know there is a Mosfet CCS followed by a Mosfet shunt controlled from the output of an opamp. The opamp is powered and gets reference from a 3-terminal reg. So, no collector involved

 

[Raj1]

Hi,

I think in terms of bang for buck performance and ease of use I'd go with Peranders boards.

In terms of performance the 317 is slightly better than a 7805, but the super regulators are considerably better than both, I can't think of a single area of improvement I didn't like. I think it's something you have to try in order to appreciate.

I haven't gone to the absolute nth degree to find better earthing etc, but I would say I'm perfectly happy to leave the cd player as is.


I tried a few different opamps (lm6171 sounded flat), ad817 sounded dry, but nothing had the overall livleyness of the ad825.

Thanks
Raja

 

[peranders]

I tried a few different opamps (lm6171 sounded flat), ad817 sounded dry, but nothing had the overall livleyness of the ad825.

If you try faster opamps than AD825 you must verify this not only by listening tests. The regulator may oscillate without your knowledge. An oscilloscope is a minumum to confirm or deny this.

It's also important that the used opamp can handle the voltages in mind and also has a predictable start up och power down performance.

 

[peranders]

...So, no collector involved

... but possibly a "drain" which is the same thing.

 

[Raj1]

Hi PA,

Yes you are right, correct measuring equipment is required. Interestingly enough the slew rate of the lm6171 isn't so fast at 5v. Maybe that's why I got away with it. All other things being considered, the ad825 is a very safe and brilliant sounding opamp, and seems to work well under a wide range of voltages in this application.

I could not be happier with the results, thanks for the support, and a great product.

Thanks
Raja

 

[peranders]

I'm also very pleased with the AD825 for it's very clean behavior. It works even down to 3.3 volts (much under the specs).