IDX-PRO+VDI

[calebsone]

its ok about the vdi i just want it to be complete when finished. anyone who did finish the vdi what setting for the oscillator 4 , 8 , or 10 mhz is the reset used as a reset and should the watch dog timer and brown out both be off?

[holyuser]

All fuse settings are included in .hex file.
Oscillator mode is INTIO2 (PIC16F88 ) or INTOSCIO (PIC16F690).
Reset is internally tied to Vdd, reset pin is an input.
The watch dog timer and brown out both are off.

[jlsilicon]

I noticed that SilverDog uses METALIZED Caps for his IDX PRO Kit.

Can these Caps be replaced by POLYPROPYLENE Caps without quality loss ?

[calebsone]

Holyuser thank you very much I just don't yet know much about the whole programming process but I am learning and I just wanted to not mess this up thanks again very much. when I have stuff ready I will show pictures.

[Gwil]

Hi jlsilicon

"Metallised" and "Polypropylene" refer to two different aspects of capacitor construction. A capacitor consists internally of two conducting layers separated by a dielectric (insulating) layer. The dielectric layer can be a plastic such as polyester, polystyrene, or polypropylene, or any one of a number of other materials such as ceramic or mica. In capacitors using plastic film as the dielectric the conducting layers can be either metal foil or a thin layer of metal deposited directly onto the film, in a process known as metallisation. There are no hard and fast rules, although usually polyester capacitors are metallised and polystyrene use foil. A capacitor simply described as "metallised" will almost certainly be polyester. Polypropylene types can be metallised or foil - in low power/low voltage situations such as the guts of a metal detector, either is OK. Polypropylene caps have somewhat superior properties to polyester so can be used without a problem, assuming they physically fit on the pcb OK. (Wikipedia has entries on capacitors in general and film caps in particular.)

Hope this helps.

Gwil

[jlsilicon]

Yes,
thanks.

[jlsilicon]

Well, I tried using Polyurethane instead of Epoxy for the Coil.
But, its flexible like stiff rubber - like tire rubber.

So, I would not suggest using Polyurethane as a solution for the Coil.

To fix this, I will am going back over it with Epoxy to solidify it.

[golfnut]

polyester resin is very hard, fast and cheap. Often used on glass fibre

eg

http://www.halfords.com/motoring/pai...as-resin-250ml

fill in stages, as volume cure gets too hot

[Koala]

I get better results with epoxy. Can take several days to fully harden this cold weather so once semi cured I but it in the oven at 50C goes rock hard.

Polyester also works and is cheaper but not as hard and I find the null alters as it cures

Both make usable coils.

[ampirate]

okay !
Finally realized what was causing the random chirping in my Metal Detector;
- I used an Automated Buzzer instead of a Piezo.
So any strong DC would create a Buzz, not an Oscillation.
Stupid mistake.
Fixed.

[ampirate]

My guess is that this Buzzer was also feeding back and creating the VDI noise ...

[golfnut]

put it back on and have a look

[ampirate]

Have not tried since I got back from Europe this summer (had to dissassemble it before I left there - to skip customs worries).
I had built it in europe this past year.

Trying to reassemble it.
Not much spare time.
No BUZZ yet.

[calebsone]

ok i got my boards from silverdog they are great smaller than i was expecting so thats a bonus. just if anyone knows how the wiring for power goes if you could help a bit you would save me some time. it looks like there is a switch wired to the board but it says p5 also theres a pot in the front called p5 so iam wondering is that pot a 100k with a switch if it is i still cant tell how all the holes near the power works. i don't know if you have pass me a hint please.

[Silver Dollar]

I have this;


I think you could use a pot with a switch on it for Sens. Silverdog even
sells some (which I got for mine).