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 12/120V inverter again
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kivdenn
Nobel Prize Winner

Uganda
535 Posts

Posted - May 25 2008 :  02:56:06 AM  Show Profile  Reply with Quote
quote:
Originally posted by audioguru

I am tired of checking your millions of circuits. Maybe somebody else can.

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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 25 2008 :  12:48:26 PM  Show Profile  Reply with Quote
quote:
Originally posted by ElectroEgg

Hi Audioguru,
If you don't mind can you tell me what formulas you used and what calculations you did to determine that a 47k resistor will give 50Hz output and a 39K will give 60Hz output.


The formula is for The Classic Cmos Oscillator and is also shown on the datasheet for the CD4047 IC.

Download Attachment: Cmos oscillator.PNG
24.34 KB

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ElectroEgg
Apprentece

Trinidad and Tobago
7 Posts

Posted - May 25 2008 :  6:10:21 PM  Show Profile  Reply with Quote
Oh I see. Thanks Audioguru
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kivdenn
Nobel Prize Winner

Uganda
535 Posts

Posted - May 26 2008 :  02:40:37 AM  Show Profile  Reply with Quote
quote:
Originally posted by audioguru

I am tired of checking your millions of circuits. Maybe somebody else can.



Why, am I being so demanding or so bothering ? If so please tell me so that I un subscribe. Mr. Moderator I need your word on this because this is a very uncivilised way of talking to a person like me. If you cant reply me and fed of my millions of circuits as you say just keep it to your self, no body needs to know your ill feelings.And that question was not specificaly directed at you Mr.Audioguru so I dont see why you atack me with such rague. Am so disapointed at MR. Villageguru.
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts

Posted - May 26 2008 :  04:09:51 AM  Show Profile  Reply with Quote
quote:
Originally posted by kivdenn

quote:
Originally posted by audioguru

I am tired of checking your millions of circuits. Maybe somebody else can.



Why, am I being so demanding or so bothering ? If so please tell me so that I un subscribe. Mr. Moderator I need your word on this because this is a very uncivilised way of talking to a person like me. If you cant reply me and fed of my millions of circuits as you say just keep it to your self, no body needs to know your ill feelings.And that question was not specificaly directed at you Mr.Audioguru so I dont see why you atack me with such rague. Am so disapointed at MR. Villageguru.



Hi kivdenn....

Calm down my friend

Being a hobbyist like you in this forum, I know for a fact that Mr. Audioguru was a nice & cooperative person like Mr. Pebe.. They assist me in my modified sine inverter even though there is an obstacle between our language (not fluent in ENGLISH). In spite of everything they help me.........like you DENNIS!!!!

So I think you should be nice also instead of being rude.

MR. AUDIOGURU ANSWERED OUR QUESTIONS AT NO COST....FOR FREE!!!


"ANSWERING NUMEROUS QUESTION POSTED IN THIS FORUM
..............IS NOT AN EASY TASK"
ESPECIALLY WHEN THERE IS A HINDRANCE BETWEEN LANGUAGES


DENNIS DON'T BE MAD. MR. AUDIOGURU IS TIRED NOT BY HELPING YOU OR ME.
HE IS A PERSON LIKE YOU. EVERYONE CAN FEEL WEARINESS.

NOBODY IS PERFECT.

juan dela cruz
Penniless INVENTOR
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 26 2008 :  09:26:12 AM  Show Profile  Reply with Quote
If you need an inverter (I don't need one) then buy an inexpensive Chinese one that is modified sine-wave and has modern parts inside using a small high frequency transformer. It even has a digital display showing how much power is being used and the remaining battery life.

Maybe somebody can take apart a modern Chinese inverter and post its schematic and parts list here.
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - May 27 2008 :  07:59:18 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
-
A PWM sine wave inverter can't be too expensive to make. I really think that. When I can, I'll make a parts list for a simple & straight forward PWM sine wave inverter. No more than 300W.
-

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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audioguru
Nobel Prize Winner

Canada
4214 Posts

Posted - May 27 2008 :  08:22:37 AM  Show Profile  Reply with Quote
The ferrite core for the high frequency transformer might be difficult to find or impossible to buy.
Maybe you must buy a cheap Chinese pure sine-wave inverter and use its transformer.
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts

Posted - May 27 2008 :  08:26:56 AM  Show Profile  Reply with Quote
Wasssup.........Johnny
Do you have the schematic diagram of the sine wave inverter that you are talking about????



juan dela cruz
Penniless INVENTOR
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - May 27 2008 :  09:32:58 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
quote:

From Audioguru:
The ferrite core for the high frequency transformer might be difficult to find or impossible to buy.


Yeah I think that might be the highest hurdle to jump over, but I have a few ideas. Keeping them to myself for now.

quote:

From Juan:
Do you have the schematic diagram of the sine wave inverter that you are talking about?


No, I haven't designed it yet. I better not get sidetracked too much, I have two projects underway. The sinewave inverter will be a switch from the kind of projects that I am currently doing and it'll be fun and very usefull.



When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts

Posted - May 29 2008 :  04:13:14 AM  Show Profile  Reply with Quote
Wasssup...johnny

Are you done with your sine wave inverter's schematic diagram?????

juan dela cruz
Penniless INVENTOR
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - May 29 2008 :  06:00:36 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
No Juan. I said I have two projects underway and I shouldn't get sidetracked. It'll be a long time before I can put pen to paper for a sinewave inverter. See you!

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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JUAN DELA CRUZ
Mad Scientist

Philippines
476 Posts

Posted - May 29 2008 :  06:58:27 AM  Show Profile  Reply with Quote
quote:
Originally posted by wasssup1990

No Juan. I said I have two projects underway and I shouldn't get sidetracked. It'll be a long time before I can put pen to paper for a sinewave inverter. See you!



Sorry for disturbing you Johnny

.........Do you know where can I find a schematic diagram of a TELEVISION aerial Signal Amplifier or VHF/ UHF amp. w/ a boost gain of Approx. 50dB?????

I've search in google and I found ckts w/ low gain(i.e. 10dB-20dB)

Thanks pal

juan dela cruz
Penniless INVENTOR
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wasssup1990
Nobel Prize Winner

A Land Down Under
2261 Posts

Posted - May 29 2008 :  10:00:29 AM  Show Profile  Visit wasssup1990's Homepage  Reply with Quote
I could only find 20dB.
http://www.electronics-lab.com/projects/rf/003/index.html
http://www.newcircuits.com/project.php?id=prjsub003
http://www.elecfree.com/electronic/tv-signal-amplifier-by-bfr90-bfr91-bfw92/

When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion.
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts

Posted - May 29 2008 :  12:53:24 PM  Show Profile  Reply with Quote
quote:
Originally posted by JUAN DELA CRUZ
.........Do you know where can I find a schematic diagram of a TELEVISION aerial Signal Amplifier or VHF/ UHF amp. w/ a boost gain of Approx. 50dB?????

That's a voltage gain of around 300 times. You would have a job keeping such a beast tame in a single unit!

Where would you use such an amplifier?
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