I think I get it. Problem with the caps though is that if they sit on top of the rails and we use 16V ones, the upper rails ground at HF will effectively become the power amp rails. I think this is asking for trouble.
- keantoken
- keantoken
Kean what makes you say that? What does HF have to do with the supply rails.
You are in effect adding a 9V battery to each rail, do you think it will become more than 9V because of some magic called HF? Who is he anyway?
Nico, the upper rail capacitors should probably go to ground, not to the lower rails. This eliminates interaction between the lower and upper rails, which is what we are trying to do with the regulators in the first place.
- keantoken
- keantoken
Krisfr, in my schematic Q7 and Q10 need heatsinks. Q7 may dissipate up to 8W. Q10 will dissipate roughly 100mA*(Vin-80).
- keantoken
- keantoken
keantoken,
The power supply in post 1367 is a terrible overkill. What does it do better that a simple circuit? What difference does it make? What are the specs? The PSRR of the output stage will dominate, so it doesn't make sense to use all these parts for the low voltage regulator.
How are you doing on the thermal analysis?
Rick
The power supply in post 1367 is a terrible overkill. What does it do better that a simple circuit? What difference does it make? What are the specs? The PSRR of the output stage will dominate, so it doesn't make sense to use all these parts for the low voltage regulator.
How are you doing on the thermal analysis?
Rick
Rick,
this is where DIYers live out their fantacies. Value engineering comes much later in life. At first you throw as many components as you can at a problem because it has to be complex, later when you become an engineer you see how few componets can achieve the same result.
Nico
this is where DIYers live out their fantacies. Value engineering comes much later in life. At first you throw as many components as you can at a problem because it has to be complex, later when you become an engineer you see how few componets can achieve the same result.
Nico
🙂Rico you sound like a Muntz ING engineer...🙂
From Wikipedia:
Muntz played the madman in his unorthodox television commercials, but in fact he was a shrewd businessman and a self-taught electrical engineer. By trial and error, taking apart and studying Philco, RCA, and DuMont televisions, he figured out how to reduce the devices' electrical components to their minimum functional number.http://en.wikipedia.org/wiki/Madman_Muntz#cite_note-sickels-20 This practice became known as "Muntzing
I like to think we are a cut above that paradigm...
From Wikipedia:
Muntz played the madman in his unorthodox television commercials, but in fact he was a shrewd businessman and a self-taught electrical engineer. By trial and error, taking apart and studying Philco, RCA, and DuMont televisions, he figured out how to reduce the devices' electrical components to their minimum functional number.http://en.wikipedia.org/wiki/Madman_Muntz#cite_note-sickels-20 This practice became known as "Muntzing
I like to think we are a cut above that paradigm...
Nico, could you restate this?
Sawreyrw, beats me. They say a good CCS makes a good shunt, and cascoding it was the only thing I could do to increase performance. Dunno yet, haven't built it yet.
I haven't got the amp thermal sim up yet. That is what I'll do next.
Muntzing:
From Wikipedia.
- keantoken
Value of engineering
Hi Krisfr,
Never heard of the term value engineeringor value management? 😕
I always thought that institutions of learning as enacted in the movies were for entertainment, maybe I was wrong and it is actual. 😱
Hi Krisfr,
Never heard of the term value engineeringor value management? 😕
I always thought that institutions of learning as enacted in the movies were for entertainment, maybe I was wrong and it is actual. 😱
If you want/need another view:
Use dual secondaries for the main PSU. bridge rectify each secondary.
Use dual secondaries for the little transformer. Tap the 9Vac onto the 45Vac to create 54Vac Bridge rectify this low current supply for +ve and bridge rectify the other 54Vac for -ve.
Now couple all the zero volts together.
This fits with not importing the mains PSU ripple and transient glitches into the low current supplies.
Use dual secondaries for the main PSU. bridge rectify each secondary.
Use dual secondaries for the little transformer. Tap the 9Vac onto the 45Vac to create 54Vac Bridge rectify this low current supply for +ve and bridge rectify the other 54Vac for -ve.
Now couple all the zero volts together.
This fits with not importing the mains PSU ripple and transient glitches into the low current supplies.
😎 read the one on Overengineering Overengineering - Wikipedia, the free encyclopedia
even funnier culteral references ... 😀
OS
I spent years training and leading Process Improvement teams. A rewarding experience if properly performed - "if properly performed" being a key aspect to success. If you are successful it really will show you the way to improving performance, quality and cost of your product or services. If your competitor is doing this better than you are then you are about to get your *** kicked in regards to profit ratio, customer satisfaction - blah blah blah. I loved doing that stuff!!!
Hi C2Cthomas,
at least there are some on the forum that apreciates the whole engineering process. It is amazing how much do nothing cr*p are added to circuits thinking that it is smart.
Since this subject is of interest to you I suppose then you also subscribe to MTBF and mimum component count to perform the specific function amicably.
Kindest regards
Nico
That's coldly analytical and not nearly magical enough.
You add parts, in the same way that you would add spices to a dish, to improve the flavour. In all situations, rare and expensive parts, just like rare and expensive spices are preferable. How else to impart the chefs brilliance?
Why don't layout jumper positions, so some could only populate the capacitor multiplier part, and others the CCSed parallel reg too. So both persuasions can have it the way they like in one board, not to make a reg second board in any case and avoid extra cost. It will also be a nice opportunity to listen with or without the whole thing and compare for those curious, and Kean's reg work not to pass non evaluated.