Thread: Revised New 16A 12V Regulator Circuit Double Checking

whats wrong with the carnetix?

Originally Posted by Nic

whats wrong with the carnetix?

I've never tried that, however that is beside the fact considering I have already spent $90 and don't feel like spending anymore than I have to for another power supply when all I need is for more filtered source power

Hi, which chip are you using? I plan to build a 12v 1A power supply for my dvd player.

Originally Posted by triwav

Ok, I first want to thank everybody who helped answer my questions on my last post Building a 12 V 15 amp Regulator got some ?. Since then I have made some changes and wanted to double check that everything will work.

Ok so I have same basic problem as before. I bought an unregulated power supply instead of an opus and am now trying to get it to work by creating my own 12 volt regulator since I can not seem to find any decently priced product out there. If you know of something please let me know.

So I have finally found a PCB board, I believe http://www.digikey.com/scripts/DkSea...?KeywordSearch. It is basically a veroboard that is mentioned in the last post as far as I can tell. This should work very well for what I'm trying to do with it being such a simple circuit.

Alright so last time I used two 7.5A regulators. This time I have decided to go with 8 2A regulators http://www.digikey.com/scripts/DkSea...?KeywordSearch with these heatsinks on them http://www.digikey.com/scripts/DkSea...?KeywordSearch. I did this for a number of reasons. 1st of all it was cheaper, saved me around a buck with an extra amp of output. Next, this one is a fixed 12 volt output so no need for resistors. While the last one had a max drop out of .7 volts. This one is only .5 volts at 2A. The last two reasons I changed was to spread out the heat over a larger area and to also not have as many amps running through each channel. Before I would of had 15 amps running through one wire. I now will only have 4 amps running through each wire.

The next thing I have done is to put in a number of capacitors http://www.digikey.com/scripts/DkSea...?KeywordSearch. Since they are so much cheaper for 10. I will be putting 4 of them on the input and of them on the output. I really don't know too much about capacitors so if these aren't the right type please let me know thanks.

Other than, it's pretty all the same. Since I never received any response on why I can't parallel the regulated power coming from the ITPS with the output my circuit I have decided to do away with it and will only be using the ITPS to send an on signal to the regulators as well of course sending the on and off sends to the systems motherboard. Thanks again for all your help and let me know if there is anything I'm missing or needs correction. Thank you.

All the links seem to point to search page only. Can you please post links to direct items such as PCB and/or schematics and parts list?

Originally Posted by mpattonm

All the links seem to point to search page only. Can you please post links to direct items such as PCB and/or schematics and parts list?

Oops sorry about that. That's one of the problems with their website. Type these part #'s in their seach engine:
regulators-PQ12RD21
PCB-V2018-ND
Capacitors-P5156-ND
Heatsinks-HS113-ND

What's wrong with 3 of these 5A 12V regulators at $1.92 each?
http://www.digikey.com/scripts/DkSea...293461&Site=US

Originally Posted by Nic

whats wrong with the carnetix?

The carnextix is no where near 16 amps. It's only 60 watts, wich is about 5 amps according to there website. 60 watts is kind of hard to get by with if you have a power hungry system.

can some1 point me at circuit diagram?

Originally Posted by Arathranar

What's wrong with 3 of these 5A 12V regulators at $1.92 each?
http://www.digikey.com/scripts/DkSea...293461&Site=US

If you looked at those, they have a LDO voltage of 1.5 VOLTS!!! that is WAY too much of a loss. Yes they're a lot cheaper in terms of amps per dollar but they won't work for this application.