The simplistic Salas low voltage shunt regulator - Page 495 - diyAudio
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Old 8th April 2012, 08:50 PM   #4941
50AE is offline 50AE  Bulgaria
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Many thanks Salas! A SK170 was dead, I replaced it and everything works fine!
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Old 8th April 2012, 08:51 PM   #4942
Salas is online now Salas  Greece
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Old 11th April 2012, 10:47 AM   #4943
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Hi,

I built the 5 to 15V version. I will be feeding 5 volts. The problem is that I'm not sure for my exact target current. The shunt will be used for supplying the DAC analog part. The chip is AK4396. On the datasheet it's said 32mA typical and 47mA max current. So how to make as constant voltage as possible? Increase output current using the load resistor?
built the same reg for same chip. Just to confirm, if I'm aiming at 100mA output and have 9.5v after rectification, R1 should be 9.5 Ohm, right? I wonder how it was calculated in other cases (att.)?
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Old 11th April 2012, 11:11 AM   #4944
johnm is offline johnm  United Kingdom
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Hi Salas.

I'd love to build one of your single-rail positive Salas Shunt Regs to power my (original version, not DCB1) Pass Labs B1 buffer. So I guess around 22-24V required.

There's a bewildering amount of schematics in this (nearly!) 500 page thread. I'd be greatful if you could point me towards the latest/best schematic to use for my B1.

Many thanks

- John
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Old 11th April 2012, 04:27 PM   #4945
AndrewT is offline AndrewT  Scotland
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9.5V is too close to 5V.
You have been told repeatedly that the Salas Style regulator needs ~7V across the reg to work properly.
That also applies when varying input voltage becomes available.
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Old 11th April 2012, 05:18 PM   #4946
Salas is online now Salas  Greece
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Quote:
Originally Posted by johnm View Post
Hi Salas.

I'd love to build one of your single-rail positive Salas Shunt Regs to power my (original version, not DCB1) Pass Labs B1 buffer. So I guess around 22-24V required.

There's a bewildering amount of schematics in this (nearly!) 500 page thread. I'd be greatful if you could point me towards the latest/best schematic to use for my B1.

Many thanks

- John
John, hi!

Fellow Briton KatieandDad had shown a combination like the one you have in mind rather recently and reported favorably. He had used a normal B1 fed from the DCB1's PSU section only. Since its a beaten path I am tempted to suggest you repeat that combo.
Here is the business end you need. Just use 10 leds for the shown row of 5. Feed it >7V than its output. R4 & R5 are check points for local currents that you may skip or not. We will be happy to learn about your progress and result.

Cheers
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Old 11th April 2012, 06:35 PM   #4947
johnm is offline johnm  United Kingdom
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Oh that's great - perfect! Thanks Salas

Yes KatieandDad mentioned it in the B1 thread - looking forward to building one shortly. Cheers for that schematic!

John
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Old 11th April 2012, 08:04 PM   #4948
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Quote:
Originally Posted by AndrewT View Post
9.5V is too close to 5V.
You have been told repeatedly that the Salas Style regulator needs ~7V across the reg to work properly.
That also applies when varying input voltage becomes available.
sorry, Andrew, with all regards, I didn't get your post at all. What R1 should be in my case to gain on output 80-100mA?
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Old 11th April 2012, 08:10 PM   #4949
Salas is online now Salas  Greece
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Use 15R 2W R1 and 9-12VAC Tx. 10R R1 will make it a bit lower impedance if your heat sinking is still happy. Talking about the 3 Leds input sections on that schematic and IRF9520. Both settings should cover 100mA load and leave enough spare for the reg to feed.
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Old 11th April 2012, 08:13 PM   #4950
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many thanks
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