Voodoo Main Discussion

[Qiaozhi]

Hi George
Thanks for coming back to me.
Unfortunately, I can't remember what the other settings were.
As I have said previously, I am not familiar with PIC's or PICkit so I will do my best to extract the information you have requested. Hopefully it should be self explanatory

Hi Martin,

I will be able to determine the settings from the EEPROM contents.

The parameters are held in EEPROM bytes 1 to 18. Byte 0 will contain $AA, which tells Voodoo to read the EEPROM contents at startup. When the PIC is first programmed all the bytes are set to $FF. If Voodoo finds $FF in byte 0 at startup, it loads the EEPROM with default values and sets byte 0 to $AA.

You will be able to see the EEPROM contents using the PICkit. If you don't know how to read the EEPROM contents out of the PIC, then simply note them down and post the numbers here.

[SilverSurfer17]

The rx coil is wound counter clockwise but the bucking coil that sits on top of it is wound clockwise

[dfbowers]

Am I wrong or the Rx coil should be winded in counter clockwise direction? [ATTACH]54326[/ATTACH]

I don?t think it matters which direction the RX coil is wound. It will make a difference as to which end is grounded though.

[SilverSurfer17]

Am i reading this correct pin 1 and 5 are shorted together for 0 volt even though it gets 0 volt already and it runs to pin 3 which i assume is used for shield ground also and i used 2 rg58A/U wire so i only have 4 wires so what run a extra wire for ground and does it have to be shielded also but then wouldn't that be running through the resistor that is inline with 3 and 5

[SilverSurfer17]

Im using that guitar shielding paint it came with a metal grounding lug and wire i don't want to use it have you found a better way to attach a wire to that paint ?

[dfbowers]

Im using that guitar shielding paint it came with a metal grounding lug and wire i don't want to use it have you found a better way to attach a wire to that paint ?

I?m trying something new, to me at least. I have painted the inside of the shell with an embedded drain wire, then added coils, then an epoxy fill and another layer of paint, then a final fill. If you look really close you can see the drain wire. It?s embedded in the paint. The paint is really thick. Not sure if it will work until I get to the wet grass.

[SilverSurfer17]

I thought about that are you stripping just the ends to make contact or the whole wire i wrapped mine in brown paper bag then painted it with the paint i have to connect the rx loop shield to the tx shield and was just going to strip the ends enough for a few wraps around the loops then paint it then do the same to run it to the head unit and figure out why pin 1 and 5 have to be connected and if shield ground is the same as both those grounds going to pin 3

[dfbowers]

I thought about that are you stripping just the ends to make contact or the whole wire i wrapped mine in brown paper bag then painted it with the paint i have to connect the rx loop shield to the tx shield and was just going to strip the ends enough for a few wraps around the loops then paint it then do the same to run it to the head unit and figure out why pin 1 and 5 have to be connected and if shield ground is the same as both those grounds going to pin 3

A paper bag works.. If you can make a good mechanical connection that is. My first shell I made was shielded that way. You can make a little electroscope to test your work. http://amasci.com/emotor/chargdet.html. If you cover the electroscope with your shield you can test the effectiveness easily. The electroscope can sense the electrostatic charges several feet away. If the meter is covered with your grounded shield of he effectiveness will become apparent.

[SilverSurfer17]

Wow thats a cool idea thanks

[SilverSurfer17]

George are 1 and 5 suppose to be shorted together and is screen the same as shield thats why there is no pin for it i want to make sure before i plug it in ?

[Qiaozhi]

George are 1 and 5 suppose to be shorted together and is screen the same as shield thats why there is no pin for it [ATTACH]54338[/ATTACH] i want to make sure before i plug it in ?

Yes, pins 1 and 5 should be shorted together. The screen of the coax cable must be connected to GND (0V), and the other end of the screen is connected to the electrostatic shield at the coil.

[godigit1]

I?m trying something new, to me at least. I have painted the inside of the shell with an embedded drain wire, then added coils, then an epoxy fill and another layer of paint, then a final fill. If you look really close you can see the drain wire. It?s embedded in the paint. The paint is really thick. Not sure if it will work until I get to the wet grass.

Hi dfbowers,

This works very well for making contact to your paint i tried it but went a little too far I split open 30 strand wire and used 4 individual strands to wrap the coil before spraying . worked great but when I do it again I will use a couple strands from 7 strand 26 awg tin plated wire .
thinking it presents less chance of becoming a target at least for a fast coil. .

Be Well

[SilverSurfer17]

Thank you i just wanted to make sure

[SilverSurfer17]

Well i figured one thing out for sure i got that new replacement 8ohm waterproof speaker plugged it in checked if it was getting hot nope not at first after about a minute checked it again and hot unplugged it plugged back in the junk speaker louder and no heat went to pick up the coil and it had gotten so hot it remelted the hot glue and stuck it to the carpet so i wouldn't suggest ever using the the 8ohm waterproof off ebay most of my waveforms look correct except 1and2 is r2 the damping resistor and its suppose to be removed off the board to test for the right value ? Also are the resistors that go with the caps of the coil damping resistors is one suppose to be removed or all and then test whats suppose to be there

[Qiaozhi]

Speaker / headphones should be high-impedance.
I don't understand your last question (some punctuation might help).