I just read the choice of power supplies... So let me get this straight, you're supplying 15 volt linear regulators from a 12 volt halfwave rectifier and you expect it to work at all? The instant you apply any load to that the linear regulators will stop working because the ripple voltage will be massively bellow it's dropout voltage especially from a half wave rectifier! Even LDO's wouldn't work properly in this situation you're working three volts under your regulator voltage at it's rated load! Might as well skip the regulators altogether cause they're not serving a purpose on anything other than a fraction of the supplies load at some perfect supply voltage.
This is a poor design choice. You NEVER EVER work AT your design goal for peak power, you have to engineer the overhead into the product.I'm using a 12VAC-1000mA wallwart and drawing 250mA from it. Because I'm not drawing full load from the wallwart, it is outputting slightly higher voltage since it's rated 12V for full load.
What I didn't account for was that a few of my customers are getting supplied with way less than the 122.5VAC I experience here. I never knew it varied that much, but thanks to this thread.. I know better.
For ripple, on a half bridge?
BAD ENGINEERING
But maybe good economics.
I don't trust working standards, too many different versions of them, and I find it especially criminal that the entire US power grid relies on a working standard. I've always found the divergence between groups such as electricians and commercial/industrial electrical engineers and electronics to be night and day, totally different mindsets.
That's self evident, transients and externally injected noise are possible in many situations, this however can be designed into the written standard with broad guidelines and caveats where appropriate. But I think things like expected line voltage at the junction box to a home should have a set standard that is clearly defined.
I just read the choice of power supplies... So let me get this straight, you're supplying 15 volt linear regulators from a 12 volt halfwave rectifier and you expect it to work at all? The instant you apply any load to that the linear regulators will stop working because the ripple voltage will be massively bellow it's dropout voltage especially from a half wave rectifier! Even LDO's wouldn't work properly in this situation you're working three volts under your regulator voltage at it's rated load! Might as well skip the regulators altogether cause they're not serving a purpose on anything other than a fraction of the supplies load at some perfect supply voltage. Granted this is efficient if it's getting the right supply voltage linear regulators need headroom and there's no way to avoid that statement.
Even the 14-0-14 won't help, you're still designing for 1 full volt under the linear regulators design specs, it just can't work! Just to properly run a 15volt LDO from (generally drop out is about 1 volt above VCC on an LDO or there abouts) you would need a 16-0-16 volt supply. And to account for source supply voltage variation 17-0-17 would be better, otherwise those regulators don't have anything to work with.
The millions of "trailer" homes in the US don't have heating, air conditioning or laundry. If they even have electricity then it plays their TV.
In Canada, our electricity is designed TO WORK PROPERLY.
If it is ever only 102V then it is a BROWNOUT where the voltage is reduced on purpose ...
...
audioguru, here's a quick statistic for you. The US has 10 times the population of Canada, lets not even talk about heavy industry differences in the consumption of electricity.
California alone (one state) is very close to the population of your entire country!
One day you might realize that we have different problems, and direct comparison is impossible... The fact that the US electrical grid works at all simply amazes me!
So in your pride for your country, keep in mind the scale in comparison to the outside world.
i've worked for companies that built prototype and production test equipment, and not only were the parts such as transformers and power supplies required to be UL approved parts (and this is mostly a concern on the primary or line side of the equipment), but construction practices were also very important. if you build the equipment properly, and use the proper testing procedures, you may not have the certification, but you did do everything right.
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