Whites Surf PI schematic

[jap]

Hi Watanabe
-u Inductance is 282uH.
- IF u do not adj. -v=-5v it no work.that u can not adj. offset.
best time
j.

[Watanabe]

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?

adjusting P1, TP2 is square:

T = 1,6ms; +V = 4V ; -V = 1,8V (characteristics of TP2).

Thanks.

[Watanabe]

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?

I used:
24 AWG
20 turns
23cm diameter
R= +- 1.9 ohm
Inductance i don't know...


Thanks


(still don't works......)

[jap]

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.

Hi Watanabe
-To get -V=-5v ---> test & change u6,C13,C14,C15,,,[Make sure the polarity].
best time
j.

[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?

[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?

[Watanabe]

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


Thanks

[Davor]

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

[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.

[Qiaozhi]

[ATTACH=CONFIG]22148[/ATTACH]

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

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

[Watanabe]

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

[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

;-)

[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

[bernte_one]

http://www.geotech1.com/forums/showthread.php?18655-Surf-PI-Pro&p=149516#post149516

look there- download the attachment

[sdesic]

Downloaded Sprint Layout demo, works fine...