The simplistic Salas low voltage shunt regulator - Page 535 - diyAudio
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Old 27th September 2012, 06:36 AM   #5341
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Salas, You pointed out correctly that I was worried before.
Simulation shows that wire loop effects to occur oscillation.
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Old 27th September 2012, 06:47 AM   #5342
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Quote:
Originally Posted by Dr.H View Post
Hi Salas, built Kazuo Ozawa version (5V) of your reg. A few observations:
1. I am using the reg to power a shunt LDR on my balanced pre-amp. I was not expecting much, given that it's just a shunt. The shunt reg is being fed by a "ALW super reg" which takes raw dc (18V) and down regulates it to 10V. Your shunt reg is then fed the 10V to produce 5V output.
2. I was surprised by the mid-range, which seemed more present/live/real using this reg in this position. I listened till 130am this morning and only went to sleep because I had to be up at 530....
3. Very keen to try the reg with the transport, DAC but....
4. I noticed at start-up that the shunts voltage output would initially spike to around 5.8-5.9V before quickly settling at 5.00V. Is this normal? I do not believe my DAC's can live above 5.5V....
5. Second q: What is the reg doing that makes it sound so good? Is it filtering noise in a way that other regs cannot?
6. Thanks for the circuit, great performer!
Nice news. What output Mosfet did you use for that Reflektor? Any pics?
In my experience they don't jump up at start. Can you see with out the pre-reg? (And also listen without).
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Old 27th September 2012, 06:52 AM   #5343
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Originally Posted by roender View Post
Hi guys,

I strongly recommend to all SALAS shunt regulator builders to insert a small value resistor between positive output of bridge rectifier and smoothing capacitor. This resistor should drop around 1V and it's value will depend of the designed current value of regulator.
I had used CRC with rather big R (4.7-10R) for pi pre filtering some times, what did you observe with a small one?
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Old 27th September 2012, 07:03 AM   #5344
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Quote:
Originally Posted by Salas View Post
I had used CRC with rather big R (4.7-10R) for pi pre filtering some times, what did you observe with a small one?
CRC dose not reduce peak diode current, hence switching noise and EMI
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Old 27th September 2012, 07:04 AM   #5345
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Ah OK you chased EMI better with RC. Did you use soft recovery diodes or normal ones?
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Old 27th September 2012, 07:10 AM   #5346
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soft and very fast ... uf4007.
Also, using resistor right after the rectifying bridge it will unburden the diods for very high transients if a low ESR smoothing cap is used, which is good for the shunt but not for the bridge
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Old 27th September 2012, 07:16 AM   #5347
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Good diodes. Also BYV27 are nice in my experience. What you use the reg for?
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Old 27th September 2012, 07:20 AM   #5348
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One 5V25 for Buffalo DAC pre-regulator, one 5V for SDtrans and two 15V for my I/V stage Low distortion, pure resistive I/V stage for Sabre Reference DAC
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Old 27th September 2012, 07:28 AM   #5349
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Very nice I/V congrats.
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Old 27th September 2012, 07:29 AM   #5350
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Originally Posted by Salas View Post
Very nice I/V congrats.
Thank you
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