I would like to build the STM-8 as close to what Sean had as possible and I have the following questions on the STM-8:
 
 On the schematic entitled, "Tiltmeter (and VRDT) Bridge Amplifier/Demodulator/Filter/DC Amplifier" (Rev 10/20/98):
 
 1) To what does the 10K resistor on the inverting input of A2 connect (6)?
 2) To what does the 10K resistor on the inverting input of A3 connect (7)?
 
On the "Block Diagram of the Electonics for the Leaf Spring Broadband Seismometer..." sheet (Rev: 25 Jan 98):
 
1) What is the schematic of the "Displacement Xducer Gain Amp and Filter 5X to 20X gain?"
 2) What is the schematic of the "Integrator, Unity Gain Instrumentation Amp 20 to 200 Seconds?"
 3) What is the schematic of the "VBB Output Amplifier and Low Pass Filter Gains 2X to 20X?"
 
Thank you,
 
Greg L. Sharp
 
mike8s2(at)hotmail.com


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I would like to build the STM-8 as close to what Sean had as possible and I have the following questions on the STM-8:
 
 On the schematic entitled, "Tiltmeter (and VRDT) Bridge Amplifier/Demodulator/Filter/DC Amplifier" (Rev 10/20/98):
 
 1) To what does the 10K resistor on the inverting input of A2 connect (6)?
 2) To what does the 10K resistor on the inverting input of A3 connect (7)?
 
On the "Block Diagram of the Electonics for the Leaf Spring Broadband Seismometer..." sheet (Rev: 25 Jan 98):
 
1) What is the schematic of the "Displacement Xducer Gain Amp and Filter 5X to 20X gain?"
 2) What is the schematic of the "Integrator, Unity Gain Instrumentation Amp 20 to 200 Seconds?"
 3) What is the schematic of the "VBB Output Amplifier and Low Pass Filter Gains 2X to 20X?"
 
Thank you,
 
Greg L. Sharp
 
mike8s2(at)hotmail.com

Do you Yahoo!?