Voodoo Main Discussion

[MartyJ1963]

@Qiaozhi,,What are the pin assignment numberings for 'U4' please? The LCD I have has pins 16 and 15 at one end and then 1 to 14. Thanks, Marty

[Altair]

My book item is arrived from Amazon: at first looking it's well promising and educative publication!
Congratulation George for your hard work, I will read it with great interest.
Thank you very much for sharing your knowledge!

[surfdetector]

@Qiaozhi,,What are the pin assignment numberings for 'U4' please? The LCD I have has pins 16 and 15 at one end and then 1 to 14. Thanks, Marty

Hi Marty,
I scanned page 26 in the book and enlarged the schematic. It looks like the LCD pins are sequential 1-16. To check orientation on the PCB, pin 4 of the LCD should have continuity to pin 38 of the PIC.

[6666]

Hi Marty,
I scanned page 26 in the book and enlarged the schematic. It looks like the LCD pins are sequential 1-16. To check orientation on the PCB, pin 4 of the LCD should have continuity to pin 38 of the PIC.

Thanks for that info, I was going to ask George the same question, pin 1 should be on silk mask, just to be clear.

[Qiaozhi]

@Qiaozhi,,What are the pin assignment numberings for 'U4' please? The LCD I have has pins 16 and 15 at one end and then 1 to 14. Thanks, Marty

In the image you posted, pin 1 is on the right-hand side (next to the ref des U4) and pin 16 is on the left-hand side.

[Qiaozhi]

Thanks for that info, I was going to ask George the same question, pin 1 should be on silk mask, just to be clear.

I've added the LCD pinout information to post #1.

[MartyJ1963]

Thanks guys for the info. @SurfDetector, I scanned them too but it hasn't helped. My PCB's arrived today (Big thanks Andy!) so I'm just gathering all the revelant information before I start. @Qiaozhi, Could you let us know what the pinout numbering of 'PL9' is please on the Silk? Like I mentioned earlier I'm having difficulty reading some of the diagrams in the book even though I've scanned them to enlarge them. Also, now I've enlarged them the lines are really faded and I still can't read the component values etc,,and I've scanned to the highest resolution I can. Regards, Marty.

[lamoiz]

I also tried making an Omega coil (not included in the book) and it did not null very well.

you mean it's not good? but was it a commercial coil or a handmade one?

[lamoiz]

I will also study a super D type double rx coil, even in a reduced size version, just to see.

[Qiaozhi]

you mean it's not good? but was it a commercial coil or a handmade one?

It was handmade, and the results were disappointing. Perhaps I did a bad job with the construction.

[Qiaozhi]

Could you let us know what the pinout numbering of 'PL9' is please on the Silk?

PL9 is the 5-pin ICSP connector. Pin #1 is on the right-hand side.

The pin names are:
1 = VPP (Programming voltage - connects to pin #1 of the PIC U2)
2 = VDD (Connects to 0V)
3 = GND (Connects to -5V)
4 = PGD (Program Data pin #40 U2)
5 = PGC (Program Control pin #39 U2)

[MartyJ1963]

Thank you Qiaozhi,,,Much appreciated. Regards, Marty

[lamoiz]

It was handmade, and the results were disappointing. Perhaps I did a bad job with the construction.

no i don't think you made a bad construction, you are a specialist. but what can explain that an omega works badly while the concentric one works well .. it's almost the same thing isn't it?

[lamoiz]

question for everyone, do you think it's a good idea to make an omega? even if it's just for testing? or is it certain that I will fail ..? your opinions please

[MartyJ1963]

Hi all,,,Has anyone started to build the Voodoo yet? Thanks, Marty.