Whites Surf PI schematic

[6666]

but it still makes a sound when moved left or right.

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.

[seadoggy]

I have a similar problem , I shielded my coil with cardboard spayed with graphite spray , but it still makes a sound when moved left or right. How did you shield you coil ?

I using alu foil + coax cable with foil inside,something is not good here!
I try use other cable with out foil same problem

[soverey]

hello i make Surf PI!the board work good,but i have small problem when i swing with coil to right make false signals!any idea what can be??
i using coax cable with shield my coil is also shielded!
regards

I have a similar problem , I shielded my coil with cardboard spayed with graphite spray , but it still makes a sound when moved left or right. How did you shield you coil ?

[seadoggy]

to sensitive mine does the same adjust it down a bit but also had falseing problems under water i was a dirty coil plug connection . turn all electrics off in the house very sensitive board. have no shielding in my coil just cheap 4 wire coil lead with silver shielding

How to solve that??its is really annoying!
i also try other coil same problem when i swing on right make sound

[junkhunter]

to sensitive mine does the same adjust it down a bit but also had falseing problems under water i was a dirty coil plug connection . turn all electrics off in the house very sensitive board. have no shielding in my coil just cheap 4 wire coil lead with silver shielding

[seadoggy]

hello i make Surf PI!the board work good,but i have small problem when i swing with coil to right make false signals!any idea what can be??
i using coax cable with shield my coil is also shielded!
regards

[daverave]

the places you marked on the schematic are not required....if no audio then you have made a mistake or some component has been damaged...check all your soldering making sure you have not shorted out any connections or pins with solder.

[peppe30679]

I have changed the buzzer with 8 ohm speaker, but not result.
I have another question: the jumpers near IRF9640 (right-left) are needed? Then, the hole between U4 and U7 goes tinned?

[daverave]

yes an 8 ohm speaker is ok.

[peppe30679]

Thanks Daverave!
Can i connect a simple 8 ohm speaker instead buzzer, without change anything (no circuit modifications)?

[daverave]

you will get some interference picked up by the coil that will cause noise on the audio...make sure you screen the coil and the pcb to help reduce noise....its best to use a normal speaker than a buzzer.

[peppe30679]

Hi guys!
I am a new member of this forum (i don't speak english very well, so excuse me )
I have some problem with surf 1.2 (Silverdog): threshold is not clear and continuos, but erratic : maybe electormagnetics field in room?
I have some doubts about the correct way of mounting the buzzer........rheofore longer (+) near r35 and (-) near volume pot is correct?
Thanks!

[yhl]

Good

[Frank-s]

Thanks
Frank-S

[kenny444]

Hello I like your Avatar,, Did you go to Abydos ? I went to see the carvings, very interesting. Ken