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  1. bob808

    LM338 power supply PCB. I want to design one for personal use.

    I also made a 3D rendering of the populated board  My first board looks nice!
  2. bob808

    LM338 power supply PCB. I want to design one for personal use.

    Hey, this is great! Thank you very much! I tried before to edit this but had no idea how. I managed to get into the editor but never did go further than that and I admit I didn't think of reading the manual  Now that I've adjusted it I could extend the ground plane and it looks better.  ...
  3. bob808

    LM338 power supply PCB. I want to design one for personal use.

    I found that by putting the heatsink on the bottom then it does not interfere with the top copper ground plane. But that way I have the heatsink outline on the back of the board so I managed to settle for a smaller ground plane in that zone. This is my outcome so far and I am pretty happy with...
  4. bob808

    LM338 power supply PCB. I want to design one for personal use.

    I'm trying but still doesn't want to. I find this weird.
  5. bob808

    LM338 power supply PCB. I want to design one for personal use.

    No, it's not connected to anything. I just need it for mechanical security, and this way I get to mount the regulator directly on the metal.   I tried to edit the part but found no way of doing so. I guess it would be ok to remove that limitation as I have the silkscreen protecting between the...
  6. bob808

    LM338 power supply PCB. I want to design one for personal use.

    I did, and it looks kind of bad. It clears the top ground plane around the whole heatsink:       I will try to insert some resistors but I have to think about it and make some calculations. Thanks for the info.
  7. bob808

    LM338 power supply PCB. I want to design one for personal use.

    I've been reading some more and found a discussion regarding LT1085. Some people have found that larger (330uF) ADJ capacitor gave better results so I increased the footprint of this capacitor and the output capacitor just to be safe. Also I've rearranged some output components. I've removed...
  8. bob808

    LM338 power supply PCB. I want to design one for personal use.

      Using Ohm's Law I cannot figure what kind of resistor I could put between the caps. I guess the trace resistance is enough :) If let's say I assume a 2A current draw from the transformer and a resistor of only 5 ohms I'll have 10V drop on it and about 20W wasted. Either I'm not understanding...
  9. bob808

    LM338 power supply PCB. I want to design one for personal use.

      I guess I could put the LED on the other side of the reg :) As I read the datasheet it's 3.5mA so a LED should cover that. But then I need a bleeding resistor on the input caps.
  10. bob808

    LM338 power supply PCB. I want to design one for personal use.

    Hello,   I guess my design is similar to about every other LM338 design inspired from the datasheet :) It's LM317 design and there are a few things differentiating them, when used in this form.   You are right about R1. I added the LED just before I posted so I forgot completely :) I removed...
  11. bob808

    Cheap DIY Headphone Amps?

    Here's a very nice looking project that I found on the web. If you search the picture on goolge you'll find many more references but I think it's called Crystal cmoy. http://cdn.instructables.com/FC9/URG8/H27LRHQM/FC9URG8H27LRHQM.LARGE.jpg It's point to point, and then it get encased in...
  12. bob808

    LM338 power supply PCB. I want to design one for personal use.

    Hello. I need to design a LM338 regulated power supply for myself. I will be using it to power two small amplifiers that I have. One TA2020 and another TDA7297. The ta2020 requires about 13.5V and the tda7297 about 16V. I think that both should require a maximum of 2A, maybe 3A tops. I won't be...
  13. bob808

    Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp

    Well...I guess I'll be needing line level anyway. I guess that'll be an excuse to go for a preamp as well :) I'll post back if I get the Zero, must go do some more research than pull the trigger on one them. Thank you for your help 
  14. bob808

    Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp

    Here's another DAC that is based on one that you recommended, in fact I think it is the same one with a case and transformer...
  15. bob808

    Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp

    Another reason for considering other options than the Zero is that I will never use the headamp. I'd like a zero without one, and cheaper :) The 24BIT 192KHZ CS8416 + AK4396 + NE5532P  looks nice and I found some info on it but I'd like to use USB as an option. I could use the M-Audio spdif...
  16. bob808

    Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp

    Hello everyone. My first post on this forum.  I am looking for a DAC at about 100-200$ max and I read some on the Zero DAC. I do own a set of low level Sony headphones and they work for my needs but I am looking for a DAC for my main system. Right now I have a modded ta2020 amp that sounds...
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