Whites Surf PI schematic

[jap]

What is "TP1", "TP2", "TP3" and "TP4"?
Thanks.

Hi Watanabe
Test pointes -TP1 for test frq.,TP2 for test offset ,TP3 for test sample 1 ,TP4 for test sample 2.
best time
j.

[sdesic]

Can someone post final PCB file (in jpeg)(single sided), placement of parts and final part list.
There is too much corrections for me in this thread.
Thank you.

[bernte_one]

hello sdesic
why you dont look for surf pi pro here
there is a pcb version from abperg including bw image with parts placement
all pots at one side of pcb for easy front panel mount
they layout includes also a trimmer for pulse width
i think it is the best choice in moment to do a version of surf pi
the additionel mods from the normal surf pi (some caps und resistors) are included or can be added

regards

[sdesic]

Found one but it is two sided... other one is only pics ...
I can't open .lay PCB file

[sdesic]

Downloaded Sprint Layout demo, works fine...

[bernte_one]

http://www.geotech1.com/forums/showt...516#post149516
look there- download the attachment

[sdesic]

It is Surf PI Pro, must read all about it ?
Two coils ?
Is it better in field ?

http://www.geotech1.com/forums/showt...516#post149516
look there- download the attachment

[Watanabe]

Hi Watanabe
Test pointes -TP1 for test frq.,TP2 for test offset ,TP3 for test sample 1 ,TP4 for test sample 2.
best time
j.

Thanks Jap

;-)

[Watanabe]

???
(still don't work...)
...

[Qiaozhi]

[ATTACH=CONFIG]22148[/ATTACH]

???
(still don't work...)
...

Have you, by some chance, forgotten about the damping resistor?

[Watanabe]

R6 (380R)? No.
Acting in P1, can leave TP2 square. This is right?


I think the problem is in the negative voltage (V-).
V- is equal at -2.8 V.
The correct value would be -5V??


Thank you.

[Davor]

You have some serious oscillation there. With correct 380ohm you could not have such huge oscillation.

[Watanabe]

I can eliminate oscillation.
I can make TP2 be square.
Is this right??? TP2 = square???
but still don't work...


Thanks

[Qiaozhi]

I can eliminate oscillation.
I can make TP2 be square.
Is this right??? TP2 = square???
but still don't work...


Thanks

TP2 is at the output of the preamp, and the signal is seriously underdamped. If you have a 380R damping resistor fitted, then the problem is probably your coil. What is its inductance?

[Davor]

It may appear as a square even if everything else works well. The exponential drop of the signal may certainly look as square. So what do you do to obtain a square?