Originally Posted by Crutshow
You could build a line powered switching regulator (which does require an inductor) but it would be dangerous, since it wouldn't be isolated from the line.
I was speaking in general, but here Off-Line Regulators - Switching Regulators are some high voltage regulators designed to work directly off line voltage.That sounds interesting (dangerous, but interesting) - is there a schematic online somewhere to look at?
if the capacitor fails short circuit the entire projects explodes into a ball of plasma, and anyone touching something electrically connected to the device will have their heart stopped.
What are you powering that takes two amps at 12 volts?
A capacitive power supply can easily do 2 amps.
You guys must not work with AC motor run/ power factor correction capacitors much. You would need only need a 25 uf 370 volt AC capacitor.
The modern ones of that value are about the size of a camera film can.
Heres a basic schematic of what you would need.
There was a sufficient number of warnings in every reply.
Here is another circuit which might suit your needs after minor modifications.
Whoa! Did I miss something? I have been trying to make a circuit like the one you showed but, EVERYONE says don't do it, it's dangerous. I need a circuit like this one that changes 120VAC to 36VAC or 48VDC at 0.66amps, if I bypass the internal bridge rectifier. It looks like I could build several of these to run my seperate driver boards. I believe I could put these circuits in a seperate box to keep everyone safe.
I am feeling generous today! here you go!
120 VAC to 40 - 48 VDC at .75 Amps peak.
Dont hurt yourself, line powered, use caution, Blah, Blah, Blah.
You were warned!
Depends on who you ask! A one amp fuse and a GFI should cover the basics. Put it in a weather tight box if its possibly going to get wet.
For a three wire cord with built in GFI on the cheap stop by garage sales or thrift stores and pick up a modern hair dryer for a couple of dollars. The cord has that built in GFI all wired up for you!
I often buy outdoor circuit breaker boxes for things that need to work in damp or wet environments. Mount the heat sink on the side some place and use silicone sealer to make it leak proof and your basically weather proof and tamper resistant and
the fuse and GFI cover everything else as far as the NEC code rules are concerned.
Pandora be dammed! Go have some almost educational fun!