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

[Albdelafar]

I measued consumption between battery and converter. I suppose that will be less between converter and detector.

I did a test with replacing a resistor to use battery without booster but the coil is very unstable and when i touch the parameters i get a coil problem.
I noticed that when my battery drop my coil and the converter emit a buzz sound.

I will take a picture soon.

[Albdelafar]

Battery with converter :

My pcb

[6666]

Battery with converter :
[ATTACH]51027[/ATTACH]
My pcb
[ATTACH]51028[/ATTACH]

Invalid Attachment, cannot see them.

[Albdelafar]

Battery with converter :

My pcb :


I tried to up my coil resistance from 0.8 to 1.5ohm but noting change.

[bernte_one]

take 4S1P 18650 cells with direct connection for power supply
the converter can be a problem

also take care of a good lf357 (or a very good copy)
often the "coil error" message is a result of bad opamp, i tested different chinese lf357 , only one type is countinous good, all other fail
or search for a lf357h (metal can) i think best you can get came from ukraine

[MDfanatic]

From the very first moment I saw the schematic of FelezJoo I knew there was a missing piece right before the LM7812, mr Hamid is not stupid to just place a rather useless component.

I don't know if the specific schematic is part of the original or a user modification but take a look and tell me what you think:

[DonCaffeDelaSkobalj]

Output current boost. Two branches much current. You can add as many as you want transistors in parallel to rise output current, but i can't see the sense about several amps current. MD should draw as little as possible current from the battery source whilemaintain full functionality.

Reg
Don

[MDfanatic]

I guess it all depends on the use. I do not want to operate the machine for more than 1 hour when I'm MDing and besides that I use a large coil (90cm) and surely a current boost would benefit the detection range (I guess?!)

@Qiaozhi you have made the schematic and you know it better than anyone, does a use off the TIP2955 makes any sense? What other resistors would need to be changed in order to integrate the TIP2955 into the circuit?
I guess that would mean to increase the resistors wattage to 1/2W or maybe 1W, solid polymer capacitors etc?

[Albdelafar]

take 4S1P 18650 cells with direct connection for power supply
the converter can be a problem

also take care of a good lf357 (or a very good copy)
often the "coil error" message is a result of bad opamp, i tested different chinese lf357 , only one type is countinous good, all other fail
or search for a lf357h (metal can) i think best you can get came from ukraine

The problem is that with the booster it works well but not for long. while by connecting the battery alone it works very badly. I have other LF357N to test I also have a 20V drill battery that I will test.

[MDfanatic]

I have other LF357N to test I also have a 20V drill battery that I will test.

You can also try LT1357, it's a better replacement over the LF357N (25MHz - 600V/μs slew rate - 2.5mA Maximum Supply Current and same pinout as LF357N!)

There is no need to use the L7812 as it does nothing but add resistance, capacitance and noise to the circuit. You can remove it and put a thick wire on pins IN & OUT, replace R19 (22K) with 13K and you are done.
You can then throw away the converter that is sucking up all the power from the batteries and does nothing more than add noise and instability to the circuit.

[Goaty]

Can anyone please help me with idiot proof instructions for installing Extreme Burner on Linux Mint (V19.3) so I can write the hex file to my ATmega 328. I’m afraid the instructions on the website don’t contain enough detail for my limited knowledge of Linux command line.

[MartyJ1963]

Hiya Trev,,,Hope you and Bridgitte are well,,,,Is Linux Mint Ubuntu?,,If it is I think you need this version of Extreme Burner for Ubuntu (File attached). Has your board arrived yet? Best regards, Marty.

[Goaty]

Hi Marty
Thanks for that but the online instructions say to install two packages first - wxGTK and libusb- and it is these causing my problems as there seem to be many versions in my version of Mint package manager.
Still waiting for the board to arrive thanks but thought I would get a head start with the software. For some reason I assumed you were using Win rather than Linux. I have managed to install the Linux version of Mplabx as that can now work with AT micros but haven't looked into how to do the fuses on it.
Cheers Trev
PS I'm also not sure whether to use the Linux version or the Ubuntu version of Extreme Burner

[MDfanatic]

I need to rephrase about the L7812, sometimes I write too much without knowing j@cksh1t, It's a bad habbit and I'm working on it.

You should not remove the L7812, If you need to use a smaller voltage battery than 18V (i.e 4 X 18650), you should use 25K trimpot at R19 and adjust it until it hits 18V+ on the display.
Do not use 12V battery with a bridge on the pins of the L7812 as the fluctuations of the battery will cause the LF357 (and pretty much everything else) to work unsteady.
Do not use step-up converters as they add too much noise on the circuit.

[folharin]

Someone can help.not record the atmega