Instructables

Is there a cheap creation to make a 110v 9-45 mA power system?

I am looking at three ways for this right now. My preferred long game is a solar cell block (minor one, i am not sure of the power output calculator cells have, but along that size I am guessing) that feeds into a digital sine wave form for my output ( low end of power is fine.)
I need the sine wave chips to do the build on a +/-110 V wave then, but the ampere I need is ultra tiny by current standards. The total power of this concept is about 1 watt.

Perhaps a amp limiter off a wall circuit second as my second but probably easier choice.

Reading up on some interesting theories, but to test them accurately, I need this base component(s).

I will post the results of what I do with the device pas or fail, as I think it will be important to some of the current over unity power system theories bouncing around to have good well documented answers.

Jack A Lopez8 months ago
The usual trick for converting DC power, from a battery, into AC power is to use a gizmo called an "inverter",
http://en.wikipedia.org/wiki/Power_inverter

And the usual inverter you can find in stores, is one designed to take its input power from a 12 volt lead-acid battery, and turn this into a modified sine wave with voltage around 120 volts (RMS). The cost of these inverters tends to scale with the maximum power they can convert/supply.  The niche these things fill is for people who want to power AC loads, like laptop chargers and power tools, from the 12V DC supply of their car (or truck).  The cheapest ones I've seen are rated at around 50 watts or so, at a price of around 20 USD, at the time of this writing. 

Also, uninterruptable power supplies ( UPSes)
http://en.wikipedia.org/wiki/Uninterruptible_power_supply
contain a similar power inverter circuit, and very often one which also runs from a 12 volt lead-acid battery.  In my home country, these can be often be found cheaply in thrift stores, or dumpsters, since people tend to just throw the whole thing out when its internal battery dies.

If you are looking for something smaller, cheaper and  lower-powered,  the circuit which charges the capacitor for a camera flash, takes around 1.5 to 3 volts as input , and produces some kind of AC output with a voltage of a few hundred volts or so. 
http://www.talkingelectronics.com/projects/XenonFlasher/XenonFlasher.html

Well, actually, the camera flash charger is intended to produce around 300 volts DC,  for to charge the capacitor for the camera flash.  However if you removed the rectifier stage and the capacitor, then this circuit will supply you with AC, at some frequency, at a few hundred volts RMS .  Also I am guessing this circuit could supply around 1 watt of power at the AC output, since that's not that much, and probably not too different from the amount of power it was intended to supply in the action of charging the camera flash capacitor.

I think building a power inverter from scratch will be very challenging, and this is why I suggest starting with some cheap gizmo that kind of already is an inverter, like the examples I've suggested above.
JBrenton (author)  Jack A Lopez7 months ago
I am looking for a parts list. I can readily handle various AC/DC inverters to my own, and I can manipulate the voltage level as well. An of the shelf fix for under 40 would also be good. I am a little sour as some jack @$$ choice to comment on what he thinks of my experimenting instead of answering the actual question and that gets me riled up.
When I said building an inverter from scratch would be challenging, I meant it would be challenging for anyone, and this was not intended as a slight against you personally.

Besides, I don't have a "parts list", or a paint-by-numbers recipe for the thing you want to build.  This is why I have suggested some devices that I think might be similar what you want to build. 

Which reminds me, I forgot to mention inverters for electrolumenescent (EL) wire.  Those produce AC voltage, at a power level similar what I think you are describing.  I've seen recipes for those.  I think I've even seen a few here on Instructables.
http://www.instructables.com/tag/type-id/?sort=none&q=driver+for+el+wire

Anyway, I wish you success with whatever it is you are building.
JBrenton (author)  Jack A Lopez7 months ago
Actually my other angles of research are pulling up a standard Wein bridge build, which looks doable. I just need to get a couple basic transistors, and I should be even able to set up a frequency control to roams from 5 hz to 300 hz, I am thinking a break out switch to 3-4 caps that cover the range areas, and a pot for fine values. Anyone have a recommendable transistor pair for this? I am looking for economy in part cost and voltage potential. I may work the oscilator to handle +/- 10-12 volts and transform that up to my 110 v need. I figure as long as I keep the starter power small, the scheme I desire will stay the same.

I am guessing the shape of the waveform is important for some reason, and that you really want something resembling a sine wave.

It may also be the case that energy efficiency is an important also, since you said this was to be part of some experimental power converter.

However, it is somewhat challenging to do both of those things at once.

If you use a linear amplifier to provide your power signal, this wastes a lot of power, because the transistors are always part-way on, and thus dissipating power themselves, as the voltage across the transistor multiplied by the current flowing through it.

For power converters, like a switching power supply, the transistors are always on, or off, because these are the states in which the transistors waste the least power.

This is the reason why inexpensive power inverters always use produce a "modified sine wave", which is not really a sine wave. You've probably seen this shape before, and if not, there's a picture of it, here:

http://en.wikipedia.org/wiki/Power_inverter#Output...

There do exist power inverters that produce a better approximation of a sine wave, or I have seen such things advertized, but I'm not totally sure how they work.

You might be able to produce some sort of really fast PWM, like using an Arduino, or your favorite microcontroller, and then just low-pass filter it.

Also, I thought I might mention, generators, the kind with actual coils and magnets. Those naturally produce sinusoidal output. So maybe you want a "rotary converter", basically a motor driving a generator, or something like that.


JBrenton (author)  Jack A Lopez7 months ago
As far as I understand the precise waveform is not critical. I generic Sine wave is all I am after. From mostly my own research, I will likely be doing a single or double wein bridge with either +/- 6 or +/-12 v peaks.

Since I don't need power output, I will probably be doing nothing with part.

Anybody build coils with high amperages? I want to make something burn proof. and I am thinking 12 ga speaker wire atm.
mpilchfamily8 months ago
Don't quite understand what your trying to do here.But a small solar cell from a calc will only give you about 1V at only a few micro amps.
JBrenton (author)  mpilchfamily8 months ago
could still be useful I might need as many as four in parallel for easy test measurements.

I still need the waveform circuit to go with it though.