chance pi build

[baum7154]

Thank you WM6. There are some other generic detector mods also in this thread, such as implementing the 3 piece take down boom offered by Whites. Making this change from my original PVC boom reduced the weight of the detector by 1pound, 1ounce, a significant weight reduction and improved pack-ability for the back country.

Regards,

Dan

[WM6]

Very valued contribution Dan, thank you.

[baum7154]

Sorry, I have been off the thread for about two weeks. This thread has all the information for the mods I have made to the original CHANCE PI. Specifically the mods are as follows:


L1 toroid choke to handle higher current

Replacement of the 390 ohm damping resistor with proper damping for a specific coil.

Audio output transformer to isolate board from chassis ground and allow grounded headphones

Explanation of the functions of the 1.2.1 firmware

Build and installation of a 2 stage amp (instructions in progress)

Amp Offset adjustment for best input at the A to D.

Increased clocking from 11.0592 to 14.318 MHz to allow 7us sampling.



The original build is covered by the Russian site as previously mentioned.

Regards,

Dan

[6666]

Cheers 6666,

Thanks for the rapid response. Is the Andy f site considered the best and most up to date 'build and test documentation' for this project?

Thanks.

I believe so, but there probably has been more discussion about it on the russian forums but you would have to go searching.

[Borisimo]

Cheers 6666,

Thanks for the rapid response. Is the Andy f site considered the best and most up to date 'build and test documentation' for this project?

Thanks.

[6666]

Chance PI D10 Value.

Can anyone tell me the value for D10 on the latest Chance PI boards. It does not appear to be on the Schematic or in the parts list.

Cheers.

From Andy's site it is a 4148

[Borisimo]

Chance PI D10 Value.

Can anyone tell me the value for D10 on the latest Chance PI boards. It does not appear to be on the Schematic or in the parts list.

Cheers.

[baum7154]

Thanks Bernd! Welcome back.

[bernte_one]

Hello Dan,

i am back from Mallorca some hours ago. Files you´ve attached seems correctly that what i need to reproduce a pcb with software.
Big Thanks. I will redraw this and when finished i upload my sprint layout files and gerber, pdf...

best regards
Bernd

[baum7154]

JPEG of 2 STAGE AMP direct heat transfer PC board masks

Attached below is a PDF of the scanned artwork mask for iron-on heat transfer to a .8" X 1.0" double sided PC board. When completed this will result in a direct plug in 2 stage amp for the CHANCE PI detector. The larger images in the PDF can be sized to 3.2"X4.0" and can be printed at 25% to yield the 0.8" X 1.0" size.



2stageampmasks.pdf

Dan

[baum7154]

Attached here is a picture of the ground plane on the component side with the tracks of the trace side 'ghosted in'. This shows the relationship between the two sides. This board is 0.8" X 1.0"



Dan

[bernte_one]

better to use a Software Printer and print this Picture to pdf Format
i cant see much details

[6666]

Dan the maximum size of a .JPG file is 1 meg
so the height x width can be anything as long as the file size is under 1 meg according to forum FAQ

[baum7154]

Thanks Leopard, I can see that the resolution of the attachment is not good enough. Not clear if the forum will allow a higher res post and if so, how to get it posted.

Dan

[leopard70]

Here it is-rotated.