In a message dated 06/06/2006, jonfr500@......... writes:

>  Have you connected the shield wire to the ground connection on the board  
yet?

No. I don't know where it is on the board. I've been trying to  look for
it, but not found it.
Hi Jon,
 
    Do you have the _http://psn.quake.net/serialamp.html_ 
(http://psn.quake.net/serialamp.html)  
    or the _http://psn.quake.net/eqamp.html_ 
(http://psn.quake.net/eqamp.html)  amplifier  board?

I am  going to have to buy a 330 ohm resistor. I know that if I
disconnect the  geophone cable from the amplifer board. I get flat line
and no spikes at  all.
    Great news! Then you don't need to buy any 330 ohm  resistors! You are 
seeing pickup on the cable.

>  (All of your connections are soldered aren't they? If not, then do  so.)

Connection inside the geophone are soldered properly. I have  terminal
block screws on the amplifer board.


? Neither of Larry's boards usually have screw  connectors? The boards 
usually have phono connectors. The outside ring with two  solder connections is the 
0V line.
 
    Look at the back of the amplifier board near  the inputs.  One input will 
have a short narrow track leading to pin 3 of  the opamp and a 10 K Ohm 
resistor. The other twin 0V inputs will have a wide  track across the board.
 
    Do you have an electric / electronic measuring  meter? 
    
    Regards,
 
    Chris Chapman





In a message dated 06/06/2006, jonfr500@......... writes:
<=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>>=20
  Have you connected the shield wire to the ground connection on the board=20
  yet?

No. I don't know where it is on the board. I've been trying to=
=20
  look for
it, but not found it.
Hi Jon,
 
    Do you have the http://psn.quake.net/serialamp.=
html 
    or the http://psn.quake.net/eqamp.html=
 amplifier=20
board?
<=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>I am=20
  going to have to buy a 330 ohm resistor. I know that if I
disconnect=
 the=20
  geophone cable from the amplifer board. I get flat line
and no spikes a=
t=20
  all.
    Great news! Then you don't need to buy any 330=20=
ohm=20
resistors! You are seeing pickup on the cable.
<=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>>=20
  (All of your connections are soldered aren't they? If not, then do=20
  so.)

Connection inside the geophone are soldered properly. I have=20
  terminal
block screws on the amplifer board.


    ? Neither of Larry's boards usually have screw=20
connectors? The boards usually have phono connectors. The outside ring with=20=
two=20
solder connections is the 0V line.
 
    Look at the back of the amplifier board ne=
ar=20
the inputs.  One input will have a short narrow track leading to pin 3=20=
of=20
the opamp and a 10 K Ohm resistor. The other twin 0V inputs will have a wide=
=20
track across the board.
 
    Do you have an electric / electronic measuring=20
meter? 
    
    Regards,
 
    Chris Chapman