Simplistic NJFET RIAA

[Salas]

I would prefer the 159Y coil, between 4700uF Panasonic. It has 11R series resistance and the voltage drop must be allowed for when calculating the mains transformer, in conjunction with the CCS current needed.

[Salas]

This would be enough if you plan a pre filter. The only benefit is that it will kill the very high frequency spray that may modulate the slightly rising shunt reg output impedance way over the audio band. (Due to output capacitor impedance and cabling as well as some active elements factors). It will surely sound calm and black.

[Salas]

For ripple itself you have not to worry, because as long as its minus is kept well over the CCS margin (taken care by the Vin-Vout dif recommended), it can not pass the CCS action. Its like having a huge coil. Actually it would be interesting to just use a minimum reactance filter with film capacitors, air core coil, and big ripple. The ripple won't pass the CCS and the quality of the components is superb. Their life expectancy, very long. This may sound better although it looks like an odd choice. Suppose we talk about a 24V Vout shunt as load in our examples, using a 25V 50VA mains trafo.

[nicoch58]

nice idea Salas

this coil? http://www.selectronic.fr/article.as...tier=90.5720-2

I have nice speakers jantzen air coil flat copper 14awg 0,68mh 0,19r are usable?

[Salas]

That coil is a nice 1H 1A double coil in a good price. Depends on what you want it for. When having a regulator with CCS like our shunt, it is too much. If you are determined to use just passive filtering, coils in the Henry range are useful.
Your 0.68mH air coils could be useful in filtering some HF noise in a PSU as CLC. Tell me what exactly you have in mind. Voltage, current, circuit function.

[nicoch58]

fine Salas

little OT here I will send mail as i need a lot psu

improve phono psu 24vdc
new psu for driver stage of amp 45vdc 100ma
new psu for power stage 40 vdc 10A

all +/- ,dual mono

[nicoch58]

collect component for shunt

jfet Ids 7.5ma?

C4 quality and range ? as I have spare caps....

[Salas]

Idss for the CCS Jfet under the Zener can be lower than 7.5mA. VGS(OFF) is kept preferably lower that way.

C4 quality may be the best audio electrolytic you prefer. Range 470uF-1000uF for the LED shunt. No less no more.

[nicoch58]

onsemi MPSA55G/05G are ok?
IRFP240PBF ok?
r8 33.2k 1% ok?
r4 47,5r 1% ok?

digikey have all...not rs-farnel

[Salas]

Semiconductors OK just Lead Free. Kyoto Japanese girls waving at Italian PM approved.

Resistors OK.