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felezjoo PI(the best pulse induction metal detector that I made until now)

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  • ok i have tried this. connecting like this burns the hex files but does not write the fuse.
    Originally posted by basellafe View Post

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    • i think your problem is the tybe of atmega about this connection i write fuses a handreds time

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      • So there are different types. What type i should buy now? How i recognize its the right type? And BTW which arduino you are using for this I am using arduino uno.
        Originally posted by basellafe View Post
        i think your problem is the tybe of atmega about this connection i write fuses a handreds time

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        • https://www.epal.pk/product/atmel-at...dip28-package/

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          • if I use two 9v batteries it works fine but they discharge in 30 minutes. if I use 3x6v 4ah in series (19.5V) lead batteries the 7812 becomes hot instantly and goes into protection. I do not understand why...

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            • That's not good. Which 7812 are you using? I assume it is 7812ct(to220 package)?
              Or is it the to92 package?
              If it's the 7812ct, then something is sinking too much current in the circuit.

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              • If I remember correctly, the L7812(TO92) is only rated for 100mA. It will definitely go into thermal shutdown.

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                • L7812CV... to220

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                  • apparently I have no shorts on the circuit.

                    probably if there was a short it would not work even with the two 9v batteries

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                    • Put meter in series with circuit and measure current draw. Then put meter before regulator and measure current draw. It could be the regulator itself.

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                      • The l7812cv is [email protected], this should be adequate for circuit. Assuming you have it on heat sink, then circuit has problems.

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                        • Does the circuit work, anything else getting hot on PCB?

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                          • no, only 7812 are very hot (with heatsink)

                            now i try to measure ampere

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                            • 950ma measured by the battery... what can it be?

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                              • to measure the circuit I would have to repack, I'll do it tomorrow. out of 7812 should be 100ma right?

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