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 12/120V inverter again
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klem
New Member

Nigeria
2 Posts

Posted - Sep 14 2006 :  08:54:47 AM  Show Profile  Reply with Quote
So how can u get it for me but after that i really want to know how to build it myself so kindly help me out with that mr audioguru.u can sent it to my mail clemangelus@yahoo.com and how to get the inverter.thanks alot
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 14 2006 :  3:01:26 PM  Show Profile  Reply with Quote
There are inverter projects that work properly on other electronics chat forums. This inverter is there too.
There are chat topics about making low power, high power, square-wave, modified sine-wave and pure sine-wave inverters with circuit examples.
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kivden
New Member

Uganda
1 Posts

Posted - Sep 15 2006 :  09:55:14 AM  Show Profile  Send kivden an AOL message  Reply with Quote
quote:
Originally posted by audioguru

Hi Phoenix,
It sounds like you need an inverter that is rated for 500W.
If you can't get a microwave oven transformer, there is another item that has a suitable transformer: a 500W inverter!

Cheap imported inverters are available that work well and are small because they use Mosfets instead of ordinary transistors. The inverters even have a digital display that shows how much power their load is drawing, and error conditions such as over-temp, over-current or low-batt.
You could take the transformer out of one of these beautiful little inverters and use it in your big ugly inverter.



Man can you get me an easy but working inverter schematic. You can post it to kivdenn@yahoo.com or just do me a favour and send me the URL on my mobile +256712727311. You will have saved me so much. God bless YOu all.
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 15 2006 :  4:04:11 PM  Show Profile  Reply with Quote
I helped fix and improve a 500W inverter on another electronics chat site:
http://www.electronics-lab.com/projects/power/033/index.html It uses common transistors instead of Mosfets that were rare in The Philipines where it is used a lot.
In the forums on that site there are many discussions and circuits for inverters. The simplest one uses a CD4047 oscillator IC with a resistor and a capacitor to set its frequency, two Mosfets and a transformer.
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ZETABOY
New Member

2 Posts

Posted - Sep 17 2006 :  2:37:25 PM  Show Profile  Reply with Quote
Any have a plan plans for build an Iverter of 5000 watts. i want buld a inverter of 5000watts
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ZETABOY
New Member

2 Posts

Posted - Sep 17 2006 :  2:42:12 PM  Show Profile  Reply with Quote
oops paper plans . if any have a idea or have one My adress is jgdiaz55@yahoo.com
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 17 2006 :  8:04:41 PM  Show Profile  Reply with Quote
A square-wave inverter is about 83% efficient so a 5000W inverter would heat with 1000W. If the battery is only 12V then the current would be a whopping 500A! A car battery would explode! 5 big car batteries in parallel would run the inverter for only 1 hour before their charge is gone.

Rediculous.
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Binary 1011001101
Nobel Prize Winner

United Kingdom
569 Posts

Posted - Sep 18 2006 :  2:54:59 PM  Show Profile  Reply with Quote
What is cheaper buying a 300W inverter of making one? i have seeen them on sale for crazy prices.
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 18 2006 :  7:03:29 PM  Show Profile  Reply with Quote
I have seen very inexpensive Chinese inverters. They cost less than the freight. I don't know if they are any good and how long they would last.
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Binary 1011001101
Nobel Prize Winner

United Kingdom
569 Posts

Posted - Sep 19 2006 :  12:08:27 PM  Show Profile  Reply with Quote
i am guessing ebay...
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mathbob
New Member

2 Posts

Posted - Sep 22 2006 :  11:58:31 AM  Show Profile  Reply with Quote
Here's a new twist. I need a simple - and cheap - way to ring a phone on stage. Needed: 50-100V, 20-50 mA or so, at 20 (yes 20) Hertz. Tis little nveter looks like it could do the trick. What values ahould the time constant have to do the 20 cycles (20-30 OK)? I'd like to run it from a 9V battery. With such low power, I'm not expecting anything to blow. Thanks!
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 22 2006 :  7:54:06 PM  Show Profile  Reply with Quote
This project has errors that cause it to waste a lot of battery power to blow up its capacitors and get hot. A little 9V battery would power it for only a few minutes before it is dead.

There are good oscillator circuits on the web designed to ring a phone.
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mathbob
New Member

2 Posts

Posted - Sep 23 2006 :  07:33:57 AM  Show Profile  Reply with Quote
"There are good oscillator circuits on the web designed to ring a phone."

Could you direct me to one? Thanks!
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 23 2006 :  4:04:28 PM  Show Profile  Reply with Quote
5 minutes in Google should find some telephone ringer circuit projects. I went looking for one I remember but couldn't find it and found two on this page instead:
http://www.qsl.net/yo5ofh/hobby%20circuits/telephone_circuits.htm
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Benito
Apprentece

5 Posts

Posted - Sep 27 2006 :  2:42:24 PM  Show Profile  Reply with Quote
quote:
Originally posted by audioguru

A square-wave inverter is about 83% efficient so a 5000W inverter would heat with 1000W. If the battery is only 12V then the current would be a whopping 500A! A car battery would explode! 5 big car batteries in parallel would run the inverter for only 1 hour before their charge is gone.

Rediculous.


Is there a formula or table that can be used to guide the tinkerer to switch the parts neccessary to get more power out in proportion to the small power in?
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