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Offline hamed_ghorbani
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« Reply #190 on: July 31, 2011, 11:30:05 pm »
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Quote:Posted by xavier
Then it must be faulty I also had one that gave me 3.2 volt that was faulty

I changed 7805 and mc34063,but my problem didn't resolved


Posted on: July 31, 2011, 10:57:46 PM
Quote:Posted by GoldDigger1950
I agree. When you put it in backwards the first time, you destroyed the device. Even if you put it in right this time, it will still fail. You will probably need a new regulator. Be mindful of the orientation of the device.

I'm sure,don't put 7805 in backward,anyway I replaced them,I'm read their data sheet and check all of my circuit board

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Posted on: July 31, 2011, 11:17:49 PM
I putout 7805,at +V I have 5.1 voltage,when I power on a led with that, I have 2,5volt...it's means problem not be at 7805,I changed MC34063,but didn't resolved,check all circuit,all hardware,again again again...I was confused

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Offline xavier
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« Reply #191 on: August 01, 2011, 07:04:16 am »
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You must be doing something wrong can you send us a pic. If you only have an LED connected to it and you only get 2.5v on the output with a 7805 that can give up to 1A output there must be a problem in your circuit. I wonder if you are measuring the voltage in the right place?

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http://www.datasheetcatalog.org/datasheets/228/390068_DS.pdf


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« Reply #192 on: August 01, 2011, 07:19:08 am »
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Check every thing on the Ground Leg of the Regulator.  They can be fooled into producing other then rated voltage. 

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« Reply #193 on: August 01, 2011, 08:29:42 am »
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Hi hamed_ghorbani
                          A quick read of the scheme OF PIM  should differentiate between your regulator 7805 and the ground here is {the battery positive} . and out OF  MC34063{the ground negative battery} --- which is the entry TO the regulator 7805 in this order, everything properly right , {after all test you do}



The most important here on the illumination of 4X20 LCD two :-
 1-adjust the VR 10K Beside to the LCD.
 2- TEST Q7

best time
j.

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Offline hamed_ghorbani
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« Reply #194 on: August 01, 2011, 09:47:41 am »
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Quote:Posted by japanese
The most important here on the illumination of 4X20 LCD two :-
 1-adjust the VR 10K Beside to the LCD.
 2- TEST Q7

hi japanese
I have 2 3 volt at my LCD,at first I think this,adjust VR or Q7 but their donit have any problem,I test my circuit with computer power,LCD show nice and backlight work good
I have 2 3volt at my circute with MC34063,this is my problem

Posted on: August 01, 2011, 08:40:17 AM
Quote:Posted by xavier
You must be doing something wrong can you send us a pic. If you only have an LED connected to it and you only get 2.5v on the output with a 7805 that can give up to 1A output there must be a problem in your circuit. I wonder if you are measuring the voltage in the right place?

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« Reply #195 on: August 01, 2011, 10:28:24 am »
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Hi hamed_ghorbani
                           After comparing - there is a bad connection in brass

best time
j.

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Offline hamed_ghorbani
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« Reply #196 on: August 01, 2011, 11:59:55 am »
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tnx a lot japanese,but their not connected,my pic has low quality
you made pim,yes?what the voltage must be at input of 7805?can i used other circuit?
why voltage drop at output of 34063?i don't know...
I'm really tired


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« Reply #197 on: August 01, 2011, 12:45:36 pm »
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Hi Hamed_ghorbani

Your board is very bad I can see a lot of areas that could have a problem also you don't listen to what we are telling you, not to mention that you said that you read the data sheet but you ask what the input voltage should be. I'm still sure that you have a short if not a few shorts on that board. An input voltage should be about 3 volts higher than your output voltage.   

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Offline hamed_ghorbani
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« Reply #198 on: August 01, 2011, 01:01:43 pm »
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Quote:Posted by xavier
Hi Hamed_ghorbani

Your board is very bad I can see a lot of areas that could have a problem also you don't listen to what we are telling you, not to mention that you said that you read the data sheet but you ask what the input voltage should be. I'm still sure that you have a short if not a few shorts on that board. An input voltage should be about 3 volts higher than your output voltage.   

tnx xavier,Ok,I make better board,that will hope to resolved it
Certainly I write this result
tnx for all

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Offline xavier
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« Reply #199 on: August 01, 2011, 01:20:08 pm »
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Best of luck with your new board and do post a pic of it once finished

Regards Xavier

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