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this may be useful to some of you just check its up todate, project i never got round to its using the large board like above if you need the copper side etc just ask.
All i want is a thankyou
Regards
I Do Not believe this board is correct.
With the Pin Connections to the 4066, Pins 10, 11 & 12 do not pass a signal out.
Removing these IC Pins from the Socket and Jumping pins 11 & 12 Together Does appear to work Ok.
Fixed the error - C7 is now a stacked poly. Here are the updated Eagle files.
@ Steve: Really I have come to the end of the road with the Surf PI project. I have a nice detector that works quite well and that I am satisfied with. I'm now moving on to fully digital, PIC controlled PI's. If you would like to take up the baton and make the improvements you have suggested then feel free to use my layout as a starting point.
Regards, Jim.
I Do Not believe this board or Schematic is correct.
With the Pin Connections to the 4066, Pins 10, 11 & 12 do not pass a signal out.
Removing these IC Pins from the Socket and Jumping pins 11 & 12 Together Does appear to work Ok.
thanks porkluvr for the help andI am very sorry for binng late
and hello evry body I have more and more questions I replaced the NE5534 with TL071 am I have to replace any other componants
like the 1 nF capacitors
hello every body I am really confused I am facing a problem with the last part of the circuit (the audio part) I really want an explanation of how the last part of the circuit works
I really appreciate any help please
hello every body I am really confused I am facing a problem with the last part of the circuit (the audio part) I really want an explanation of how the last part of the circuit works
I really appreciate any help please
thanks ApBerg
and I have another question what is the reason of the 1000uF capacitor because when I inserted it the out put of TL071 -that I replaced the NE5534 with- was bad and By removing it the signal form TL071 becomes much better
I appreciate any help thanks
terhaka
thanks ApBerg
and I have another question what is the reason of the 1000uF capacitor because when I inserted it the out put of TL071 -that I replaced the NE5534 with- was bad and By removing it the signal form TL071 becomes much better
I appreciate any help thanks
terhaka
Think you better use NE5534 or a LT1115 if you can get it.
question what is the reason of the 1000uF capacitor :
After the fet (Irf9640) is switched on, the 1000uF cap. can supply fast the needed energy to the coil, the battery's cannot give so fast the energy that is needed .. In the time that the fet is closed the battery's refill the 1000uF cap.
Think that the 1000uF cap. is a bucket full of water, if you empty it you have in a short time plenty water, in the 'time out' it refills via a water hose.
In a PI design the tracks that are needed for the "batt-cap-coil'' circuit need to be solid and short...
Hope it is clear... or somebody can give a better explanation..
very clear explanation thanks ApBerg I hope to have your email to be in touch with you any time
terhaka
Hello Terhaka, You can mail me with the help from the Geotech Community options.. there is also my mailadres. It is however wise to ask your questions here it the Forum, there are many friends here that now much more about detector-electronics than I do.. and that way we all learn !
hello ApBerg and every body
apberg thanks for the email I want it to have a direct chat with you cuase I have so many questions and also you may find in me a good friend and also as you said every body here is helping I learned many things here
i have finished your pcb design yesterday
works from first start
many thanks again
next days i will start to tune and change some parts
like recommended from ApBerg
i think i change: ne5534 to lt 1115, main cap value and reinforce the solder tracks to coil output
but i could need some infos to get best setting point
so if anyone can give me datas for testing points where i can set up right voltages at ic
i would be happy
have anyone here tried the dual field coil for surf pi or is same performance like the monoloop (for example 2*150 till 180 microH in serie 15cm inner 30cm outer)
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