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 12/120V inverter again
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Jun 14 2006 :  4:17:44 PM  Show Profile  Reply with Quote
That circuit has the same problems as this one:
1) The emitter-base junctions of the transistors have avalanche breakdown.
2) The 180 ohm resistors don't supply enough base current to the transistors.

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WaasiL
Apprentece

5 Posts

Posted - Jun 15 2006 :  07:58:45 AM  Show Profile  Reply with Quote
Hello to all.

What could be the easiest inverter to build? In a matter of parts and simplicity?

Waasil

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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Jun 16 2006 :  5:07:04 PM  Show Profile  Reply with Quote
This one is simple and easy:
A Cmos CD4047 oscillator needs just a resistor and a capacitor to make a low frequency perfect square-wave and also has an inverted output to drive a push-pull pair of darlington transistors or Mosfets to drive a center-tapped stepup transformer.

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WaasiL
Apprentece

5 Posts

Posted - Jun 17 2006 :  01:45:10 AM  Show Profile  Reply with Quote
Thanks allot audioguru for your reply.

1-What could be the wattage of that inverter?
2-Where can I get its schematic.

By the way, is it possible to use small normal transformer ( the ones which are in radios) just to test the inverter if it is working or not before buying a large transformer?

Please help me.

Thanks in advance.
WaasiL

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abdo_87
New Member

Libya
2 Posts

Posted - Jun 17 2006 :  04:37:52 AM  Show Profile  Send abdo_87 an ICQ Message  Reply with Quote
hi to every human in here,please could any body send me information about simple electronic transmitter

asd
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Jun 17 2006 :  08:06:21 AM  Show Profile  Reply with Quote
quote:

1-What could be the wattage of that inverter?

About 150W with a pair of darlington output transistors, or about 1kW with a pair of modern Mosfets. I saw a very powerful inverter that used 16 Mosfets.

quote:
2-Where can I get its schematic.

It is simple. Draw it yourself. Copy a Chinese one.

quote:
By the way, is it possible to use small normal transformer ( the ones which are in radios) just to test the inverter if it is working or not before buying a large transformer?

Yes, but it won't prove anything except that the oscillator works. You can test the oscillator without a transformer.

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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Jun 17 2006 :  08:10:58 AM  Show Profile  Reply with Quote
quote:

hi to every human in here,please could any body send me information about simple electronic transmitter

This topic is about the inverter project, not about a transmitter.
You can find out information and find FM transmitter projects in Google.

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WaasiL
Apprentece

5 Posts

Posted - Jun 17 2006 :  08:15:23 AM  Show Profile  Reply with Quote
Thanks a lot for your kind information audioguru.
Although, you said it is simple, I cant draw it my self as I can't visualize how it looks like.

Where can I get the Chinese schimatic one which you are reffering to?

Please continue your kind help.

Regards,

WaasiL



Edited by - WaasiL on Jun 17 2006 08:17:24 AM

Edited by - WaasiL on Jun 17 2006 08:22:51 AM
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Jun 17 2006 :  09:05:35 AM  Show Profile  Reply with Quote
A CD4047 oscillator has just one IC, one resistor and one capacitor. It drives two push-pull Mosfets. The Mosfets connect to a center-tapped transformer. A simple inverter is that simple.

I can buy a very nice Chinese-made inverter for a low price. It is small, has a fan inside for cooling, a display of the output power and battery voltage. It probably uses a pair of Mosfets to drive its transformer with a square-wave.

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tinker290
New Member

USA
1 Posts

Posted - Aug 30 2006 :  04:03:11 AM  Show Profile  Reply with Quote
what site can you get this chinese inverter from you mentioned here. I just got a 2500 rated inverter it has no fuses or low voltage cut off or reverse hook up protection. atleast it has the 2 fans. How would i go about making this safer from overloads and shorts I would also like to control the fans by a thermostat instead of having 2 fans running constantly thank you in advance
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emeka@yahoo.com
New Member

Nigeria
1 Posts

Posted - Aug 30 2006 :  04:54:19 AM  Show Profile  Reply with Quote
aaron, from all the question and answers, do you still insist on ur circuit diagram or will you modify,and is that diagram the only way to produce an inverter , what are other ways, because it seems that capacitors is been a probrem there. has it any problem Making the transformer more than or less than 12 turns , and increasing or reducing the secondary turns as well

don
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Aaron Cake
Administrator

Canada
6702 Posts

Posted - Aug 30 2006 :  09:17:56 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
I'll be happy to post a proper inverter schematic if someone provides one. I don't have the time or desire to design one and if I do, people will just poke holes in it.
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Aug 30 2006 :  2:06:46 PM  Show Profile  Reply with Quote
People only poke holes in crappy circuits that blow up and don't work!

I posted links to a few simple inverter circuits that work, but now the links are gone.
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klem
New Member

Nigeria
2 Posts

Posted - Sep 13 2006 :  2:52:12 PM  Show Profile  Reply with Quote
mr moderator what is the problem with ur circuit why are people complainng have u really yried it ur self ?if it works pls asure me to go ahead with it if not kindly state the required components that will make it work.
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - Sep 13 2006 :  7:58:15 PM  Show Profile  Reply with Quote
This inverter project doesn't work. There are a few other inverter circuits on the web that work fine.
I can buy a Chinese inverter at a local store that works fine and costs a lot less than the parts to make one.
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