PiTone-v2-by-Eddy71 Has anyone on here built this ?

[David_1]

[David_1]

Hi,
if you ask already... I find the original drawn circuit diagram by Eddy71 much more strucktured and pleasant to look at. Maybe it is because I draw my circuit diagrams in a similar manner. But this is my personal preferences only.
Which software are you using to draw the circuit? Try Diptrace (www.diptrace.com).... It is easy to use and has nicer schematic symbols.

I use Labcenter Porteus have done for too many years to change now yes Eddy's drawing is nice, but my circuit is not quite the same just today I swapped over the two op amps for a better layout.
Drawing is something I like to do, I had a second pcb to make, but decided my traces / tracks would be better if I rerouted them, in the end the whole pcb is now new ... LOL
but not finished yet

[GeoMax]

Hi,
if you ask already... I find the original drawn circuit diagram by Eddy71 much more strucktured and pleasant to look at. Maybe it is because I draw my circuit diagrams in a similar manner. But this is my personal preferences only.
Which software are you using to draw the circuit? Try Diptrace (www.diptrace.com).... It is easy to use and has nicer schematic symbols.

[David_1]

Hi,
your drawing contains errors. The PiTone-2 is a much smarter circuit design.

So please you noticed I am working to put things right... is there anything you would change ?

[GeoMax]

am I right in thinking these are very similar but with different micros ?

Hi,

no they are not similar at all. The PiTone-2 is a much smarter circuit design as the FelezJoo PI.

[GeoMax]

I like things drawn a little different, so I redrew Eddies drawing, its almost Identical your thoughts ?

Hi,
your drawing contains errors. This is not the same as the original circuit. Some components are missing.

[GeoMax]

Hi Eddy71,

thanks for the info. I must have overlooked this.

[Eddy71]

Above I have described and given graphs of the detection voltage of the metal response pulses

[GeoMax]

Hi,
can someone explain what the in red color highlight TL072 opamp circuit part, does?

[David_1]

So this is the same schematic as the other pcb only small 30x36mm also has pads added to program on the pcb. I will not make this until I have tested the other PCB the good news is its now in the UK should be delivered very soon

[David_1]

My pcb that I am drawing now is 33 x 36mm , the ones stuck in China are a little bigger ... I think that faa thing that grounded planes. has caused the delay

[Eddy71]

Found it in old diary entries

[bernte_one]

I also forgot to write. When repeating the detector the most dangerous part of the project is the purchase of TL072 and IRF740.
Many times I bought them on Aliexpress and they always sent a fake one.

maybe you can try TME.eu next time

and thanks for explanation

[Eddy71]

I also forgot to write. When repeating the detector the most dangerous part of the project is the purchase of TL072 and IRF740.
Many times I bought them on Aliexpress and they always sent a fake one.

[Eddy71]

The resistance of R3,R4,R7 and R18 depends on the inductance and parasitic capacitance of the search coil.
Three slots on the board R3,R4,R7 for easy selection of the resistance. First we use a variable resistor to determine the required damping, and then we solder 2-3 resistors with the same total resistance.

R18, P1 and C6 form an integrating circuit.
The form of the voltage drop on it should be equivalent to the form of the induction voltage drop on the search coil. Then the sensitivity of the device is maximum.