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

[ivconic]

About R19... i see possible confusions here among some members.
R19 is NOT regulating NO working voltage!
By adjusting it is not possible to adjust and set any of the working voltages.
R19 (on my pcb is trimmer 20k) is serving there only to provide voltage reference for accurate LCD displaying of state on the battery.
I replaced resistor with trimmer only to be able to fine readjust and trim the value which will be displayed on LCD.
It's completely irrelevant and you may use resistor instead.

[ivconic]

I also forgot to correct few more mistakes too. Sorry.
Here it is, completely corrected file;

[ivconic]

R19 is actually 22k, and it should go to the input of U4 (7812). The signal at pin 24 of U1 (ATmega328P) is used to monitor the input voltage from the battery.

Correct!
I made there mistake and now it is monitoring and indicating wrong value.
It should be corrected.
Trimer is there to trim fine the input voltage to mcu... though not necessary .
Well observed!

[pigeon]

if you download and install bullzip pdf printer you can get pdf version
I attached pdf versions.
[ATTACH]35491[/ATTACH]

thank you friend

[samii]

if you download and install bullzip pdf printer you can get pdf version
I attached pdf versions.
pcb.rar

[karim1980]

To run it in 12 volts you must change the value of R19.

Exactly how much value because I have tried to do this to make the value of r19 to 18k And i change U4 (7812) to 7809 But were damaged controller and the screen
sorry the my bad english

[Arionas]

Download Documents (FelJPi_IC_mk)
Install Sprint Layout for Pc...........
Open file
and Go to Print

[pigeon]

hi friends

thanks IVONIC and ARIONAS

i search format pdf version

sorry I apologize

[Arionas]

Thanxs Mister Ivconic.........

[chevesne]

Hi ivconic! What software can view this format?

Sprint Layout

[jladre]

It means possible to change the current value by 20k Until the device runs on 12v ?

To run it in 12 volts you must change the value of R19.

[karim1980]

It means possible to change the current value by 20k Until the device runs on 12v ?

[jladre]

...

Hi ivconic! What software can view this format?

[Qiaozhi]

Hello
24. leg of atmega connected over 20k to OUT leg of 7812 on İvconik new PCB , But On old pcb and schematic this connection going İN leg of 7812 .
Which one is correct? Maybe both are correct?

R19 is actually 22k, and it should go to the input of U4 (7812). The signal at pin 24 of U1 (ATmega328P) is used to monitor the input voltage from the battery.

[samii]

Hello
24. leg of atmega connected over 20k to OUT leg of 7812 on İvconik new PCB , But On old pcb and schematic this connection going İN leg of 7812 .
Which one is correct? Maybe both are correct?