BRN Pi-1 DİJİTAL Pİ

[mohandes]

The hex and layout files for the ck047 project are at
http://www.geotech1.com/forums/showt...406#post172406

thanks 6666
are you make it?is it correct?
how connection two PCB together?
is it deeper pi?

[6666]

thanks 6666
are you make it?is it correct?
how connection two PCB together?
is it deeper pi?

NO I have not made it, maybe one day.

[bernte_one]

i have made some changes to get the second op amp stage
please check and confirm

[bernte_one]

have made new layout for this scheme
http://www.geotech1.com/forums/attac...chmentid=23505

can you remind?

[mohandes]

have made new layout for this scheme
http://www.geotech1.com/forums/attac...chmentid=23505

can you remind?

hi.
why do not use irf740?and correvt.
van tell me about detection.is deeper?

[bernte_one]

i will test for you what works better

can also try a variable damping resistor

[cko47]

In BRN PI-1 project quartz resonator frequency 4 Mhz is very small for good precision of detecting. Must be 20 Mhz or more. I not see in this project adjusting the following parameters: main delay. second delay, sample width. It is very simplified variant of existing project. Therefore it can not have good parameters (including depth).

[bernte_one]

next days i will finish second Version with second opamp stage, results will follow

[bernte_one]

can i Change the Crystal from 4mhz to 10mz or 20mhz without other changes?

[mohandes]

hi
bernte , are you finish it?

[cko47]

can i Change the Crystal from 4mhz to 10mz or 20mhz without other changes?

Yes, it is possible. But it will be necessary to make changes to program and anew it to compile. Besides it is necessary to replace capacitors in a circuit of a crystal. See datasheet for MCU. The analog converter (used by the author) has low precision (resolution) of conversion. Russian use another principle. It allows to receive very high resolution. It is checked myself. And I use this principle in my project. In my project crystal have frequency 40 MHz and resolution is 0.25 microseconds.

[bernte_one]

i am busy this time with pi Projects from book itmd
but brn pi 2nd Version is on the top of my list

one of this this simple Projects which works from the start and only Need some Little improovements

[reza vir]

i am busy this time with pi Projects from book itmd
but brn pi 2nd Version is on the top of my list

one of this this simple Projects which works from the start and only Need some Little improovements

Hi Bernte_on
Do the small changes in hardware
Sense metal has changed?
Please tell your performance
Thanks & Regards

[bernte_one]

hello Reza,

i have not checked performace for 2nd vers.

at last i build a 70cm round coil for vers. 1 with 12turns 0,6mm wire gives me 350µH (like a big Frame coil on on plastic water pipes but round)


@all
i plan to take some scope shot on this detector
so where can i measure the interesting things
pulse Timing
damping curve
others....

i want to understnad how it all works, the circuit itself seem very easy Performance is good in relation of These few parts on the pcb

[dennisgold]

hello. i have a big problem. i buiuld this project exactly that scheme. i record brn pic 876a but the win pic, win800 and ic prog said programing error code. is on windows xp and the lcd display only appears in black screen in the superior part
help me please. the hex is rong?