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Subject: Re: Station GVA current Schematic for low resistance Geophone SPZ (HS10)
From: Christopher Chapman chrisatupw@.......
Date: Tue, 14 Dec 2010 07:16:15 -0500




Subject: Station GVA current Schematic for low resistance Geophone SPZ (HS=
10)


t completed a crude N=3D8 Gain x1 LPF with a knee at 10Hz (about)=20
and my first try went well. I think this is BUTTERWORTH.=20
=20
http://gmvoeth.home.mchsi.com/LATEST/CIRCUIT/GVA_CIRCUIT.HTML=20
=20
Hi Geoff,


    Your circuit is faulty. You need an additional 2 muF capacitor across=
 R1.B

Chris Chapman



Subject: Station GVA current Schematic for low resistance Geophone SPZ (H= S10)

t completed a crud= e N=3D8 Gain x1 LPF with a knee at 10Hz (about) 
and my first try went well. I think this is BUTTERWORTH. 
 
http://gmvoeth.home.mchsi.com/LATEST/CIRCUIT/GVA_CIRCUIT.= HTML 
 
Hi= Geoff,
 
    Your circuit is faulty. You need= an additional 2 muF capacitor across R1.B
 
Chris Chapman


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