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 12/120V inverter again
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts

Posted - Jun 14 2014 :  1:34:32 PM  Show Profile  Reply with Quote
The original circuit is over 10 years old.

It was rubbish when it was designed - it's still rubbish now!
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David70
New Member

Bangladesh
2 Posts

Posted - Oct 13 2014 :  08:37:55 AM  Show Profile  Reply with Quote
Quote from schematic page: "This circuit can be tricky to get going. Differences in transformers, transistors, parts substitutions or anything else not on this page may cause it to not function."

watson
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melecio
New Member

Philippines
1 Posts

Posted - Mar 17 2015 :  9:27:48 PM  Show Profile  Reply with Quote
Sir how about If I wanted to increase the load capacity of the inverter from 12 to 240 volts 3000 to 5000 watts pure sinusoidal wave output does the diagram the same in the above post.

May I know what electronics devices should I change values and formula for the computation of each part if you have.

Thanks
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Mar 21 2015 :  12:16:04 PM  Show Profile  Reply with Quote
quote:
Originally posted by melecio

Sir how about If I wanted to increase the load capacity of the inverter from 12 to 240 volts 3000 to 5000 watts pure sinusoidal wave output does the diagram the same in the above post.

May I know what electronics devices should I change values and formula for the computation of each part if you have.

Thanks


Everybody agrees that the circuit of the inverter has many errors and is much too simple.

You need to go to school and learn about the basics of electronics to learn what must be changed so the output is 240V instead of 120V (hint, instead of a 120V to 24V center-tapped transformer use a 240V to 24V center-tapped transformer), to learn how to completely redesign the inverter for an enormous load of 5000W and to learn how to design a sinewave inverter.
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btendengu1
New Member

Zimbabwe
1 Posts

Posted - Mar 25 2015 :  10:00:09 AM  Show Profile  Reply with Quote
I WANT TO KNOW THE METHOD USED TO CALCULATE OR TO SIZE A PURE FERRITE TORROID CORE IN COMING UP WITH THE PROPER WINDINGS LEADING TO THE RIGHT WATTAGE FOR PURE SINE WAVE INVERTERS, FOR EXAMPLE I NEED I PURE FERRITE TOROIDAL CORE FOR PROPER POWER RATING OR WATTAGE SAY 3KW 4KW , WHAT CRITERIA DO THEY USE. PLEASE DO HELP OUT.

BERNARD TENDENGU
HARARE ZIMBABWE
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Mar 31 2015 :  5:51:35 PM  Show Profile  Reply with Quote
Don't you have ordinary electricity? 4kW would power a small city.
The battery for it would be almost the size of a car.

Most of us would use an inverter when we are away from home and are camping, fishing or hunting and use it to light a few lights at night.

My electricity is reliable and inexpensive. I never go away camping, fishing or hunting so I have never needed an inverter.
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wilkes5
New Member

2 Posts

Posted - Apr 14 2015 :  12:00:15 AM  Show Profile  Reply with Quote
quote:
Originally posted by audioguru

BTW, Will,
The 500W inverter project that I fixed was reported to deliver 720W. So its output transistors must have had an emitter current of almost 15A.Since its driver transistos were connected in a darlinton arrangement, they probably had a collector current that exceeded that of the output transistors, and all currents went into the transformer. I would never push transistors so hard, therefore rated the circuit at only 500W.
The link to that schematic is posted again here:
http://www.electronics-lab.com/forum/attachments/500Watts_Inverter.gif





would like to build your circuit as to modify a home audio processor to function in my car...

http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55634d1409924155-modding-home-processor-car-audio-img_0718.jpg


http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55635d1409924155-modding-home-processor-car-audio-img_0721.jpg

http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55636d1409924155-modding-home-processor-car-audio-img_0722.jpg

http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55637d1409925049-modding-home-processor-car-audio-img_0723.jpg

http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55638d1409925049-modding-home-processor-car-audio-img_0724.jpg

http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55639d1409925049-modding-home-processor-car-audio-img_0725.jpg
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 16 2015 :  12:48:16 PM  Show Profile  Reply with Quote
Please post your schematics HERE instead of posing links to the diymobile website that we do not belong to.
An audio crossover/processor circuit probably runs on a low DC voltage and does not need the inverter providing it with a high AC voltage.
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - May 17 2015 :  10:32:24 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
quote:
Originally posted by wilkes5
would like to build your circuit as to modify a home audio processor to function in my car...

http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55634d1409924155-modding-home-processor-car-audio-img_0718.jpg


http://www.diymobileaudio.com/forum/attachments/amp-guts-modifications-custom-crossovers/55635d1409924155-modding-home-processor-car-audio-img_0721.jpg




Unfortunately the forum software does not allow me to break this post out into a new thread. Please create your own topic for this question instead of posting within the inverter topic.

Also, the schematics you linked to require registration to view.
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