Salas SSLV1.3 UltraBiB shunt regulator

[Salas]

Can't tell. Are the LEDs correctly oriented for instance? Does it work with conventional bridge diodes?

 

[matjazsket]

Takes not only more space but yet another dual independent secondaries transformer and higher total shunt PSUs dissipation nonetheless.
Although you would notch down the CC current burden per reg in dual mono, the minimum spare current dissipation remains the same and multiplies heat by the more reg units.

If I use it mainly for headphones, would it also sound wider?

 

[Supersurfer]

Hi,

The problem is fixed, made a stuped mistake and the dummy resistor was to low thus draining all headroom.

Regards,

 

[Salas]

If I use it mainly for headphones, would it also sound wider?

On speakers mainly. Some headphones are wider than others. Like an AKG K702 will always be wider than a Sennheiser 600 no matter if the preamp helps it a little more.

 

[Salas]

The problem is fixed, made a stuped mistake and the dummy resistor was to low thus draining all headroom.

Nice. No build related problem then.

 

[matjazsket]

On speakers mainly. Some headphones are wider than others. Like an AKG K702 will always be wider than a Sennheiser 600 no matter if the preamp helps it a little more.

Nice to hear that. By chance I have K702's and the main reason I decided to build DCG3 was because of them. In the beginning I intended to build it with dual mono PSU but I decided to try it first with one PSU but the spare current was a bit of a concern. Now it's clear - dual mono is the way to go. Thanks.

 

[juliobozek]

hi! i am building a shunt for my dac. i would like to know how to make fixed 150mA, 8V version. also i want to make shunt as small as possible (mainly capacitor size). i would be very grateful if you could help me

 

[Salas]

This thread is about a certain shunt reg. It's a wide topic, so I suggest you build this one as it is. Since 8V 150mA are well within it's range.

 

[juliobozek]

yes i understand, but could i choose capacitors with lower capacity and voltage ratings?

 

[Salas]

For C1 C2 and 8V standard output you can use 16V capacitors. C3 has to still fall in the given ESR range and lower voltage ones go up in ESR so check datasheets to find one that fits all parameters. Although 150mA is not a big current better keep C1 in substantial uF value for better ripple. C2 no less than 220uF for good internal voltage reference noise filtering.

 

[juliobozek]

thank you very much!

 

[juliobozek]

hi! i have made an idea of low power salas shunt for my dac. 0.5W (max) disipated on each mosfet, about 60mA spare current, CC is about 210mA, Vout is 8V, Vin is 11V. Dimensions 55x25mm. it will be fed by golden reference low voltage power supply (GRLV) made by kevin gilmore, designer of dynalo amp series. this is very stable power supply but salas shunt wil add low output impedance and further improve ripple. GRLV is fed by meanwell SMPS brick (15V). i want to thank you Salas for your help

 

[juliobozek]

P.S.
i am a student who likes to diy. i have no interest in selling anything, just building it for myself

 

[Supersurfer]

Hi,

How much voltage headroom is needed in this design? I have 26,3vdc right after the rectifier. Can I set it to 26vdc on output?
The current is set at 130mA (100mA shunt overhead)

Regards,

 

[Salas]

Hi,

This answer comes from the reg's pdf guide:

"The reg works even with less than 5V difference because CCmA weakening starts only at Vin-Vout <1.7V for ~200 CCmA settings. At 600mA CC it starts weakening at Vin-Vout <2.5V. But more voltage space allows for mains play and for better M1's parasitic capacitance."

 

[69mach1]

Hi supersurfer,

Can you share some more pictures with the saligny? how you attached these and where?
Do you notice an improvement with the saligny's?

I am planning the same, so i'm interested!!

regard,
John

Hi,

I have build 2 ultrabib positive regulators and cannot get them to run.
I attched a toroid transformer with 30vac output and used a saligny mosfet rectifier. R1 is below the pcb.
On both regulators I get 3,45v output and cannot set the voltage.

Did I make an obvious mistake?

Hope you can help.

Kind regards,

 

[Supersurfer]

Like this

 

[alexkosha]

Hi Salas,

Short question…
My volume step attenuator (quad) is quite long and interfering mechanically with one of Neg regulators C2 and C3 Ele caps. Is it OK to use 5cm legs on these to move them aside a bit? It will add some inductance and might very little impedance… Thank you.

 

[Salas]

Hi

No don't extend those caps pins, C3 especially not. Oscillation danger or performance worsening the least. Find shorter stature elecaps maybe?

 

[alexkosha]

Hi

No don't extend those caps pins, C3 especially not. Oscillation danger or performance worsening the least. Find shorter stature elecaps maybe?

I see. I’ll try to go from backside then. Thank you.