Whites Surf PI schematic

[folharin]

someone found problem for constant beeps in surf pi.I changed the components 2 times and not forward

[seadoggy]

ive had same problem with both my surf pi's...at the end of swing makes a false signal....i waived a small white magnet in front of my coils and hardly any signal from magnet so i guess it cannot be the earth's magnetic field cancellation so not really sure whats causing this

I dont know how fix this,i make new surf pi and same problem it is really annoying when i go search.
i try new coil with shield whit out shield same problem.
also i change cable still same.
I make this surf pi

[daverave]

ive had same problem with both my surf pi's...at the end of swing makes a false signal....i waived a small white magnet in front of my coils and hardly any signal from magnet so i guess it cannot be the earth's magnetic field cancellation so not really sure whats causing this

[kt315]

try load via Go Advanced form. Quick Reply window is not working for load of pic.

[seadoggy]

I make this board of surf pi
i cant upload image

[kt315]

a magnet is too ferrous =)

[seadoggy]

Maybe a dumb question. If earth field is causing the problem would it make a difference if facing north, east, south or west when swinging the coil?

In every side make sound to right when swing with coil!,it is normal that surf pi can detect small magnet??

[green]

Maybe a dumb question. If earth field is causing the problem would it make a difference if facing north, east, south or west when swinging the coil?

[seadoggy]

Today i make new Surf PI and new coil shielded but same problem(when swing to right make sound lol)
also i go out from my house its more stable but problem remain.
I dont know what is going on in left side no make sound only when swing to right.
Regards

[kt315]

Thats odd, but you can check the sample pulses are getting to the intergrater with an audio amp, you should hear a tone, its crude but it is an indicator.

coil - shielded. good
cable - shielded. good
housing - ? not shielded. bad or good?

[6666]

only make sound when i swing with surf pi in right side

Thats odd, but you can check the sample pulses are getting to the intergrater with an audio amp, you should hear a tone, its crude but it is an indicator.

[kt315]

maybe you get interference trouble, so try retune PPS on even value to electric lines standart frequency in your country.

nice value is due 600Hz this is kinda universal value worldwide
60 * 5 * 2 or 50 * 6 * 2

for delta pulse choiced 100 PPS for 50Hz
120 PPS for 60Hz.

[seadoggy]

The Surf-PI incorporates Earth Field cancellation by default, You don't have to do anything.

U7A is the gate for the main sample, and U7B is the gate for the late (Earth Field) sample.
6666 is suggesting that you probe U7 pin5 with an oscilloscope to confirm the EF pulse is present.

i dont have scope mate ,can be this solved in other way,i also try put trimpot in place of R6 dumping resistor same thing!!,only make sound when i swing with surf pi in right side

[Qiaozhi]

what i must do to cancel earth field??its is possible test with ferrite rod?
my coil is 0.350 mh
thx

The Surf-PI incorporates Earth Field cancellation by default, You don't have to do anything.

U7A is the gate for the main sample, and U7B is the gate for the late (Earth Field) sample.
6666 is suggesting that you probe U7 pin5 with an oscilloscope to confirm the EF pulse is present.

[seadoggy]

While we dont have all the answers , your description sounds a little like the earth field is not being cancelled , check that you have both sample pulses on the 4066, and check that the target signal is going to both inputs of the integrator.

what i must do to cancel earth field??its is possible test with ferrite rod?
my coil is 0.350 mh
thx