The simplistic Salas low voltage shunt regulator

[Bksabath]

Originally Posted by Salas

Not higher than 200mV pk-pk ripple would be nice.

I tried a comon mode coke made up with 2 wires wound up togheter on a coil
at the output of a LM317 regulator and it did make big difference
Maybe is worth a try and compare impressions?

[krivium]

It should be doable.
I like the idea to have lesser heat on M1 and better prefiltering.
Thank you very much Salas!

Regards.

[Salas]

Originally Posted by Bksabath

I tried a comon mode coke made up with 2 wires wound up togheter on a coil
at the output of a LM317 regulator and it did make big difference
Maybe is worth a try and compare impressions?

Common mode is always nice because it cleans up ground too.

[dimkasta]

Salas congrats for your skill and thank you for your amazing contributions. I have been reading your threads like crazy during the past few days, and I must say I am impressed of the work that you and others have put into these circuits.
At the same time I feel completely overwhelmed by information since I cannot understand everything (being a semi-ignorant diy dude), and running through the entire threads can be very tedious.

Could you please give me your opinion on using the reflektor (or any other variant of your PSUs) to power the motor of a Technics SL1200 MK2?
The turntable requires 21V at ~500mA peak.

[Salas]

Don't know what the motor may give it for phase stability as a load, you gotta try it to see it will do OK, since nobody had used on MK2 before so to tell you what's gonna happen. The Reflektor is the simplest to make and gives steady voltage easily. Use 1 Ohm R1 and BF245A without source resistor if you haven't got K170. No more than 30Vin and 2C/W common sink for the (insulated) Mosfets.

[dimkasta]

I expected something like that about the motor. I tried to edit the post to make a correction but the 30minutes had passed

I do not plan to power the motor directly. More of its driving circuit instead, so I don t think it would be much of a problem as a load.

I found a big bunch of 2SK170BL yesterday rated at between 6 and 10 mA so I guess I ll be fine using them (I hate waiting for stuff....)

[didiet78]

Hi Salas,
Can you suggest me which one Shunt reg suitable for Pumpkin Pre-Amp (+/- 24V, 150mA) and for Aleph 1.7 (+60V, 200mA)?

Didiet

[jackinnj]

Originally Posted by Salas

They are output impedance traces versus frequency. Dotted is their phase. You can read the one I posted before in dB, also in Ohm as such (~7mOhm flat portion):

My (actual) Salas is better than your (simmed) Salas:



Salas BIB with IRF HexFETs.

[nicoch58]

the Technics SL1200 don't use a sort of elettronic feedback for control the speed ?

[Salas]

Originally Posted by jackinnj

My (actual) Salas is better than your (simmed) Salas:

Salas BIB with IRF HexFETs.

With how much CCS current? Standard bib 9610,9530,Zobel termination? Looks like there is more Gfs and Ciss than in the shunt hexfet model? *7mOhm was referencing the reflektor