Is there a Salas high voltage (60v) high quality shunt regulator for me to try?
It should be +/-60v, as it would be used for powering low current stages on a power amp.
It should be +/-60v, as it would be used for powering low current stages on a power amp.
DVBProjekt (DIYAudio user) had some Salas HV shunt regs made up. I use one for 120v valve power. It rocks!
Here you go:
http://www.diyaudio.com/forums/blogs/dvb-projekt/561-sshv-shunt-module.html
Recommended! 🙂
Thanks, Lucas.
That page complements the measurements to the other one I mentioned above. It seems like a very nice supply.
Any impedance or noise figures or curves anywhere for it?
Carlos
That page complements the measurements to the other one I mentioned above. It seems like a very nice supply.
Any impedance or noise figures or curves anywhere for it?
Carlos
As you need symmetric, you should go to the SSHV thread, there I have shown its negative mirror also that has been implemented by a few members successfully.
Can you be more specific or put the URL for that SSHV thread?
The first search I did here got me nothing named like that?
Not just to avoid going through 182 pages of posts, but to know if there's some merit to it.
Would it be better to use two positive shunt regulators, or to use a positive and a negative regulator? Symmetry would bring me some benefit?
Would it be better to use two positive shunt regulators, or to use a positive and a negative regulator? Symmetry would bring me some benefit?
My first option for these regulators are with 3X7 types, and it seems that using two positive types 317s seem to have better impedance and noise specs.
So if I can accept two chip positives, why not two discrete ones?
Once again: that is if using symmetric HV shunts will not bring me any benefits. Will they?
So if I can accept two chip positives, why not two discrete ones?
Once again: that is if using symmetric HV shunts will not bring me any benefits. Will they?
I have been recommending building negative Salas Regs since these use cheaper and more readily available components.
There is some possibility that the negative, using Nchannel devices, reg could perform slightly better than the positive reg, using Pchannel devices.
There is some possibility that the negative, using Nchannel devices, reg could perform slightly better than the positive reg, using Pchannel devices.
Hi Andrew
Would you please elaborate on the benefits of using two negative regs besides the cost factor ?
I read a lot about the benefits of using two 317 based positive regs. The fixed negative series regs always show worst performance in the datasheets also.
So this is completely new to me (appart from your previous statements I read before).
Ricardo
Would you please elaborate on the benefits of using two negative regs besides the cost factor ?
I read a lot about the benefits of using two 317 based positive regs. The fixed negative series regs always show worst performance in the datasheets also.
So this is completely new to me (appart from your previous statements I read before).
Ricardo
Hi Salas,
I like this simple shunt design, and moreover I love how easily it is to get parts for this shunt locally here
I planned to build one v1.2R (pos and neg) in around 2 weeks from now after my schedule is a bit cleared up, but before, I have some questions, first, here's the plan:
Well, that's it, sorry for the long questions, anyways, you rocks!
I like this simple shunt design, and moreover I love how easily it is to get parts for this shunt locally here
I planned to build one v1.2R (pos and neg) in around 2 weeks from now after my schedule is a bit cleared up, but before, I have some questions, first, here's the plan:
- I'm going to use a small enclosure (roughly 10cm W x 16cm L x 6cm H), this enclosure will double as a heatsink, is 4mm thick aluminum and have additional fins (1cm deep i think) outside along the left and right side of it.
- The target output voltage is +/- 12V
- The set current on R1 will be adjustable for 100mA, 200mA, and 300mA load current respectively using a rotary switch
- I'm using the BJT CCS version simply because I can get a bag of BC550/560 for the price of one K170BL here...
- Toroid i'm using outputting 21V after rectification and filtering
- Will thermal drift be an issue for such a case above? i.e. temperature will cause change on Q9's current, thus changing the V drop across R11 and in effect making the Vref voltage drifting?
- If it will be a problem, can I revert back to the Vref from the v1.0, using a zener? If so, should I change the value of C1 back into 100uF or keep it at 4.7uF?
- On the case of using zener as Vref, what is the best scenario to put a trimmer to "fine tune" the output voltage (i.e. within 1V), so I can get exactly symmetrical voltage at +/- 12V, is it by using small value trimmer in series with the zener or somewhere else?
- What do you think is the best shunt current to load current ratio? i.e. 180mA through R1 for 80mA shunt current and 100mA load makes it 1:1.25 ratio...
Well, that's it, sorry for the long questions, anyways, you rocks!
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