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Old 13th November 2014, 05:48 AM   #311
hartbigsky is offline hartbigsky  United States
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So I have been teaching myself the different components of this regulator by reading textbooks on my own. I understand the voltage divider on pin 2 of the AD811. Pin 3 I am still not so sure of. Is it in this configuration to be used in a reverse biased mode, in that at 2.5V it functions as an open circuit with limited current not as a 2.5V reference source? What will pin 2 be seeing on pin 3. I know the 811 is a current sensing op amp. With pin 6 output driving the vertical DMOS what is happening at +in, I know under most circumstances no real current flows into an op amp[op amp rules] but rules can be broken under certain circumstances. I guess I am struggling with how this regulating circuit is functioning on my own. Anybody have a non textbook length explanation unless you like to type? Thanks for any help!

apprentice DIYer,
Steve
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Old 13th November 2014, 07:37 AM   #312
hartbigsky is offline hartbigsky  United States
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Click the image to open in full size.
Sorry in above post I meant to say unlimited current flow as opposed to reverse bias breakdown current flow. In all the examples I find the anode is at ground and the resistor at the + rail and the reference voltage at its junction. I don't now what you get when the resistor is at ground and the cathode at + rail, what is +in on the AD811 getting, just ground making -in[pin2] virtual ground? What is the diode (voltage regulator) doing? Is it a 2.5V drop as a zener function? Hope someone can help

Steve
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Old 13th November 2014, 07:55 PM   #313
hartbigsky is offline hartbigsky  United States
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[IMG]http://www.diyaudio.com/forums/diy question.jpg[/IMG]

If this file opens see if I am on the right track from the 2 previous post. Thanks!!

Steve
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Old 29th January 2015, 03:33 PM   #314
Mickey Solder is offline Mickey Solder  Germany
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To see the fine pics, I really passed the registration procedure. This is an inspiring article, even to beginners like me. Can you image a guy, looking forward for to his first DAC design based on the TDA1543?! For sure, it's hard to remember for you folks.
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Old 12th April 2015, 09:08 AM   #315
johnm is offline johnm  United Kingdom
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Are Peter Daniel PCBs still available for this DAC? I made one 6 years back and enjoyed the process, then stupidly sold it a few years later. I'd like to build another.

Cheers,

John.
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Old 14th June 2015, 03:05 PM   #316
johnm is offline johnm  United Kingdom
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I'll assume not then. Pity...
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Old 17th September 2016, 12:04 PM   #317
Piotr is offline Piotr  Poland
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Hi, have you been discussing the subject of i2s input series resisors causing HF filtration? Is this a good idea or not so good?
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Old 1st December 2016, 05:36 AM   #318
naim2 is offline naim2
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Hi,
Did anyone compared Peter's DAC v1 vs v3? Just wondering how they sound different and how the v3 improved on the v1. any comment appreciated. thanks David
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