Barracuda Legend Kit Problems

[Old cart]

Old cart it is polerized i will try it and see what happens.

To Clarify put the whichever pin the red lead is on, if the reading is positive , is where you should solder the cap + lead. I would interchange the red and black leads on the pins if the reading is negative to avoid any confusion about which pin is more positive.

[Old cart]

I've already added a 10K pot. I had a "spider" wound coil (has former with 37 slots inside and out), which was very slow, as in insufficient delay adjustment. With the meter on it, the reading glitched, when I touched a certain area. I can only imagine it to be a scratched insulation short. I'll rewind.


I do have that interference. :-) It is annoying. I switched off my florescent "CSI style" magnifier/work light before taking the shots. 60Hz mains from the high voltage transformer, I'd guess.


Several photos from assorted angles, not 100% indentifiable but close I hope.

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Ray

Thanks Ray for these great pics.

[kt315]

Thanks Ray for these great pics.

guys, i ask you to help me to ask bluetube to give clear pics of his board.
http://www.geotech1.com/forums/showt...-Baracuda-help
my english is bad... you know it, emotionally pale, so i hope on your assistance in that. write in his thread more and make a noise you can do.
if we will get the pics so i will see something new and tell you more.

[Impulse]

impulse were these taken with the old or new board?

This was the old board

[6666]

guys, i ask you to help me to ask bluetube to give clear pics of his board.
http://www.geotech1.com/forums/showt...-Baracuda-help
my english is bad... you know it, emotionally pale, so i hope on your assistance in that. write in his thread more and make a noise you can do.
if we will get the pics so i will see something new and tell you more.

Done.

[raygdunn]

no i mean i cannot physically move it around if i move it BEEPBEEPBEEP i do not understand why? what wire are you using between the coil and board? I have a dual core foil covered + sheilded cable.

I'm with you now. I've yet to use coil screening. I'd do experience some mild ground effects on the PI-1 with a low capacitance thick plastic insulation wound coil, which is to be expected. Also I do remember the odd beep at end of a swing, until I tightened the coil restraints.

I use spare TV extension leads that come with video recorders and the like. Length a metre and a bit. (Just discovered that lengths do vary). Remove socket on one end only. I repurposed parts from a TV aerial splitter socket box for a plug to go in the wall of the electronics box. Plan B there would be to glue in the plug just cut off as they are a mating pair. That is of course the "use what's to hand" approach.

Ahh... I've pulled all the wires, added a battery and my Barracuda has had its first trip to the garden and yes random...ish Beep...Beep. I'm moving the coil around holding it mid lead, as there may be some hand capacitance effects, if I hold the bare coil. (Seems to make little difference actually). My first shot at sorting this will be securing the short coil ends leading to the cable. I'm using quite thick coil wire. I'll have to play with it later, but I mine would have to be coil movement I would have thought. Another idea will be trying it mobile with the PI-1. It may just be the same. Then try some another coil. Look for a pattern.

Stopping movement is one of the reasons for "potting" the coil. I've just got a few thread ties holding mine plus occasional masking tape securing it to a backing plastic disk for rigidity.

I'm very much with you now😞

Ray

[jladre]

"Beep...beep..beeep" sound?
Be sure that your coil cable has a good and not loose connection, the screen must properly connected to the ground, and last be sure your coil is properly fix to the shell so that it will not have movement inside during sweeping.

[Impulse]

This is progress! Try depth test now. Have you got a .1uf cap? If so please solder it, with the leads cut as short as possible. One the back of the board between pins 7 and 14 on the 40106. Remember the pins are upside down and reversed becuase this is the back of the board so confirm before soldering.

on second thought this dual core coax probably has high capacitance. Swap it for coax as soon as you can.

I have swapped the cable for a peice of coax and now my pc won't work again. I still cannot move it without it giving a false signal

[Impulse]

"Beep...beep..beeep" sound?
Be sure that your coil cable has a good and not loose connection, the screen must properly connected to the ground, and last be sure your coil is properly fix to the shell so that it will not have movement inside during sweeping.

I have zip tied the cable down and the connections are solid I have the coax core as the + and the shield as the -. The coil is glued to a piece of thick cardboard and then glued to the shaft that I am going to use

[jladre]

I have zip tied the cable down and the connections are solid I have the coax core as the + and the shield as the -. The coil is glued to a piece of thick cardboard and then glued to the shaft that I am going to use

Does beeping still exist even you sweep the coil at 1 meter above parallel to the ground?

[Old cart]

I have swapped the cable for a peice of coax and now my pc won't work again. I still cannot move it without it giving a false signal

This must be very frustrating... All these motion problems! Show me a clear picture of the coil, cable, board end of cable and general surrounding pics. Do you have any radio stations. industrial plants or large electrical equipment like power lines near your house?
if no take on of you coils and connect it to the scope, no detector just the coil and the set the scope to the most sensitive range.
try 5 uS per div.

[Impulse]

Ok once I get my pc back up and running I will upload the scope shots

Here's my test set up I have tried it in the garden and still beep beep beep in mid air. I live next to the coast the most powerful electrical thing near me is my TV and I turn it off when I am testing the board.

[Impulse]

Does beeping still exist even you sweep the coil at 1 meter above parallel to the ground?

Yes it is there no matter how high off the ground it is

[Old cart]

Ok once I get my pc back up and running I will upload the scope shots

Here's my test set up I have tried it in the garden and still beep beep beep in mid air. I live next to the coast the most powerful electrical thing near me is my TV and I turn it off when I am testing the board.

I did not see any photos. The still could be some kind of noise generator near your house. All your traces have a fair amount of noise. It could even be your PC which are notoriously noisy. If you compare you sample gates screen shots to Ray's you will note several times the noise. I don't know if this is coming from your scope PC or something else. Can you stil borrow the fluke scope from you work place? Maybe we should give that a go.
i worked for Tektronix for 31 years so I am very aware how much differences they are between expensive and hobbiest grade equipment. This is not to criticize anyone, but just to say that we need to be aware of test equipment limitations.

BTW I did a little research and saw some comments saying that that people had damaged their PC using USB based oscilloscopes. I have no idea what they were measuring but certainly it is possible since they are electrically connected. More expensive PC connected scopes use what is called galvanic isolation which just means they are not electrically connected to the PC. I think many use optical isolation.

[Impulse]