PIM-2 Digital Metal Detector Project

[volcano]

thank you Jap
I have made very good PCB and I test all components ( voltage ok)
look, I said that I have Atmega8A PU, not Atmega8 there is the A at the last

Another thing,in the two PCB I have a Dropout ( the display chow 10 vdc only ) and when I measure it with multimeter I get it 10 vdc

[jap]

So the question is : if I can use this ATMEGA8A-PU, and must I use ATMEGA8-16PI ?

Hi volcano
--good for succeede for programming Atmega8.
-Any Atmega8-xxx worked.
-good result---> come from good coil,good pcb,good work.
-what the results?
best time
j.

[volcano]

Hi Jap
I made the project ( PIM-2 ) again, I use ATMEGA8A-PU
But I have not got a good result
So the question is : if I can use this ATMEGA8A-PU, and must I use ATMEGA8-16PI ?

thanks

[jap]

after that the atmega is dead, and I test 5v on D1, sometimes it reaches 8v
I decided to replace d1, 2 c3, 2,5,6

Hi hamma
-OK
-re programming D2 IF not ,replace it.
best time
j.

[hamma]

I worked in this direction, it is OK, sounds now become crazy all the time, I found that v_signial voltage is not stable at "atmega/23", so i followed the wrong signial on "D3 / 1,2, 3 "up to R41 and T8. I stop because I slam my VD7.

I changed the diode and back to work some time, after that the atmega is dead, and I test 5v on D1, sometimes it reaches 8v, which due grilled atmega.

I decided to replace d1, 2 c3, 2,5,6. it will suffice you think?

I'm waiting on Monday for the shops.

In my country the weekend lasts two and a half days

I eager to resume
thank you still, good Sunday

[jap]

sometimes goes crazy or sometimes return to the usual noise without detect.

Hi hamma
When you say sometimes the mistake in a bad welding or bad connection in pcb,, please re welding to some points and check copper on the links of the pcb.
best time
j.

[hamma]

Hi hamma
-The sound Weak or delayed?
-test T2, C27
-speaker in 1,2 in J2
-Test +5V C3,5,6,2
-Not adjustment
best time
j.

hi jap, thank for replay
the sound is exactly like in the videos on YouTube
when I approach the metal, the display reacted with discrimination OK
but the sound mute until the bars decrease, and sometimes goes crazy or sometimes return to the usual noise without detect.

(i tested there are OK) all supply +5v, +12v, GND, are OK, and conform to schema,
one thing, tr2 4,5, 5v, 30-120 mV!!

you propose other test?

[volcano]

now I understand
thank you Jap

[jap]

Hi volcano
best time
j.

[volcano]

thank you Jap
But I can not open the two programs ( code and eeprom at one time )

[jap]

Hi volcano
Thank you,to program Atmega8 see zip file.
best time
j.

[volcano]

hi Jap, How are you
please tell me how to program Atmega8 ( I use code or eeprom or the two ???? )

thanks

[jap]

Hi hamma
-The sound Weak or delayed?
-test T2, C27
-speaker in 1,2 in J2
-Test +5V C3,5,6,2
-Not adjustment
best time
j.

[hamma]

re
it works now only sound was far behind the display (which is correct)! an idea?
otherwise, I try to understand the adjustment of option ...

[hamma]

hi
i used 680R/2W, and i adjust somme bad weld
heat disappeared soon after having adjust
thank you all
I test the coil now