Bipolar PI design

[Carl-NC]

I have completed testing the Bipolar PI design and posted new firmware. I changed the timing to use 1 timer and is now all interrupt-driven, there are no polling delays. This gives the delay adjustments more resolution and more consistency.

Two things I don't like about the design. One is that the demods are a bit glitchy in that they pass through some transients. I don't know if this is a particular problem with the 4316 switches or what. I have not seen this in other designs I've done. Second is that the audio is not all that great. The 555 VCO does not have as much frequency range as I recall from when I breadboarded the circuit. And the transient glitches from the demods gives the audio a little it of a raspy sound. With a little tinkering, both might be solvable but I don't have the time right now.

[ivconic]

I have completed testing the Bipolar PI design and posted new firmware. I changed the timing to use 1 timer and is now all interrupt-driven, there are no polling delays. This gives the delay adjustments more resolution and more consistency.

Two things I don't like about the design. One is that the demods are a bit glitchy in that they pass through some transients. I don't know if this is a particular problem with the 4316 switches or what. I have not seen this in other designs I've done. Second is that the audio is not all that great. The 555 VCO does not have as much frequency range as I recall from when I breadboarded the circuit. And the transient glitches from the demods gives the audio a little it of a raspy sound. With a little tinkering, both might be solvable but I don't have the time right now.

Simple 10 seconds video of what you described?

[Carl-NC]

Sorry, I took the circuit down. If I get time later today I'll set it back up.

[ivconic]

Thanks anyway.
A friend sent me PIC from abroad.
PCB's will be done soon.
So I am not giving up, with or without video.
I think it is splendid example for future upgrades and improvements.
So, if you have; time do the video, if not; not a problem at all.

[algan]

Hello ,Ivconic can you post the lay shape of the board without the solder mask that you drew I want to make some corrections before I release the boards.. Thanks.

[ivconic]

I don't have it without ground planes.
Here is the original Carls files (gerber):
https://www.geotech1.com/forums/foru...olar-pi-design

[algan]

yes, but the Carl Gerbers are with a program that I didn't draw and I can't convert them to Sprint Layout or EasyEDA for correction, and in your post #54 the mask is drawn by hand, that's why I asked, I thought you had a file that you can do correction.but there are no problems, I started to delete the top layer, it's slow, but it will be as Carl said, I need sound correction and someone else

[GeoMax]

Hi Algan,

why don't you just draw your own circuit board? Then you can make any changes you want and you don't have to rely on the work of others.

[Toros]

yes, but the Carl Gerbers are with a program that I didn't draw and I can't convert them to Sprint Layout or EasyEDA for correction, and in your post #54 the mask is drawn by hand, that's why I asked, I thought you had a file that you can do correction.but there are no problems, I started to delete the top layer, it's slow, but it will be as Carl said, I need sound correction and someone else

In half an hour or so, you can clean up the board that you converted from the Gerber files by marking the unnecessary paths and using the "delete" function. Then you use the "test" function and check for missing connections.If there are any, you restore them using the "track" function. It's laborious, I know, but unfortunately the Gerber import function of Sprint Layout is imperfect.
See partially cleaned circuit board.

[algan]

Yes, I managed to draw two boards 80mmx90mm, but I still have the generator and around the generator, which will also be on a separate board, yes it will be smaller and yes the errors may not be seen until the detector is launched, but it is important, as they say, the idea and everyone can experiment with different variants, the important thing is to try.

[fx5]

hello
Has anyone finished this project?

Where is the hex file?

thank you

[Carl-NC]

All files are here.

[Toros]

All files are here.

Carl, the first links there don't work.

[Carl-NC]

Fixed

[Carl-NC]

I've created a video describing the Bipolar PI circuit. Sorry for the poor quality, I need some better equipment.