The simplistic Salas low voltage shunt regulator - Page 575 - diyAudio
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Old 19th February 2013, 04:33 PM   #5741
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Salas you recomend In older post that Q1 and Q2 got to be tied and matched for hfe
what about Q3 and Q4 - do they need to be tied and matched and also matched to Q1 and Q2 hfe
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Old 19th February 2013, 04:39 PM   #5742
Salas is offline Salas  Greece
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Not that influential than the upper pair. This mirror solves some issues of the just 2 bjt simplest mirror there is. See to have same Vbe in the lower pair and not too big difference in hfe to the matched pair is a thing enough you can do. 5% or even 10% near hfe is acceptable even in the matched.
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Old 19th February 2013, 05:39 PM   #5743
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thank you very much for your patience and generousity
I appreciate very much your support
I join boys offered to call you papa Salas
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Old 19th February 2013, 05:43 PM   #5744
Salas is offline Salas  Greece
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Old 19th February 2013, 06:02 PM   #5745
stajo is offline stajo  Sweden
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Old 20th February 2013, 01:26 AM   #5746
kp93300 is offline kp93300  Malaysia
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I want to build the salas shunt to power a class d amp requiring 24 v dc and about 2.5 amp .
Is this feasible with this circuit and if feasible , what are the changes necesary for the schematic in post no 1 of this thread?
My transformer is 22V ac and about 300W.
thanks for the help
k93300
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Old 20th February 2013, 02:28 AM   #5747
Salas is offline Salas  Greece
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Hi, see that post in a relative thread Using the HYPNOTIZE as a general shunt reg PCB
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Old 20th February 2013, 06:49 AM   #5748
regal is offline regal  United States
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What are the voltage limits for the negative and positive, low current for biasig tubes.
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Old 20th February 2013, 07:04 AM   #5749
atupi is offline atupi  Romania
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Salas, your shunt is just amazing! After different power supplies tested in my DAC i've powered the single opamp that is after the DAC chip (AK4396) from DCB1 shunt and the sound is amazing, what a voice, what details. I think i will pus some Salas shunt to my every home appliance

If i choose to power also the receiver and dac chips from a Salas shunt and after the shunt i have those Lm1117-3.3 and 1117-5 i still benefit from the shunt advantages ?
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Last edited by atupi; 20th February 2013 at 07:24 AM.
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Old 20th February 2013, 11:33 AM   #5750
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I have been using quite some salas shunts over the past years. I am using 4 LV's and 2 HV's in my dac and even use one to power my 24v Aikido preamp. Very happy with them!

I am not sure whether this topic has been discussed before, but I just read the article regarding regulators in Linear Audio vol 4. To my very surprise, the Salas shunt was evaluated both objectively (rejection, noise, impedance) and subjectively (listening panel) as number 12 out of 13. The comment noted was "slightly coarse, not engaging, competent but uninteresting, not well coordinated, somewhat murky".

This does not match my personal findings, although I have not compared with other discrete regs. Does anyone care to comment who DID do HIMSELF a comparison with other discrete (super)regs?

Curious to comments!

Edit: after reading my post, I want to make absolutely sure that I am very thankful to Salas for this design and as mentioned I am very happy with mine! No harm intended!
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