• PSN San Jose Geophones

• Geophone FAQ

• PSN San Jose Lehman Sensor

• PSN Redwood City Lehman Sensor

• Shackleford-Gundersen Sensor

• Article by Allan Coleman on lengthening the natural period of a Lehman seismometer.

• Homebuilt Seismograph FAQ.

• E-Mail correspondence on how to build a Lehman Seismograph.

AS-1 Vertical Seismometer installation, operation and troubleshooting documentation and videos

• AS1 Purdue EDU calibration and installation PDF
• AS1_classroom_seismometer_setup.
• AS1_classroom_seismometer_troubleshooting.
• AS-1extended013 Period Board Amp
• AS-1origonal011AS-1 Type Amplifier
• SICHUAN0805120628CHUK trace example

AS-1 Horizontal Seismometer installation, operation and troubleshooting documentation

• AS-1 The SEPUK Lehman Manual
• MagDamper009 design Documentation

4.5 Hz Geophone x10 Period Extension Circuit

• GeophoneExtensionCircuit008
• GeophoneExtensionParts 007

For currently available PSN software see:

PSN Redwood City availbe software

• WinQuake

• WinSDR
• Earthworm Modules
• Dos Programs
• Other Files

For Raspberry PI Shake see:

• Introduction
• RShake Setup
• TCP/IP Mode using WinSDR Server
• UDP Packet Mode
• Using WinSDR

• Lehman Zip - Original Lehman article and plans  by Jim Lehman

• A simple Vertical Seismograph

• A White Paper on A/D system dynamic range needed for seismic recording.
• Article by Bob Barns on a method you can use to calibrate your sensor.

• Guidelines for Installing Broadband Seismic Instrumentation. Interesting information from the Berkeley Seismograph Station Web site.

• The late Sean Morrissey's Website. Many excellent papers.

• PSN Preamp by Pete Rowe

• PSN Filter Amp by Pete Rowe

• Amp by Sean-Thomas  Morrissey

Equipment for Sale

• Seismic Amplifier/Filter Board

• Telemetry Demodulator Board

• Now Shipping - 12/16 Bit Analog to Digital Converter Board.