PSN-L Email List Message

Subject: Need pwr. supp. schematic for Amp/filter board
From: George Bush ke6pxp@.......
Date: Sat, 08 Aug 2009 13:53:15 -0700

Hi Larry-

The new system is working beautifully. I appreciate your equipment,
software, and help! Now I want to correct a frustration with the Seismic
Amplifier/filter board part of the system. I have absolutely no complalints
with the board. For a while I was running both the new serial and the old
comp board A/D systems in parallel at the end of the 100' cable between my
garage and my shop plus another 50' of cable to the house and a drum
galvonometer, and your amp board drove all of this perfectly!

But during the many years the system has been operating, the UPS on the
system in the garage has failed and been replaced 3 times. I want to go to
a battery/trickle charger setup and get rid of the UPS dc to ac converter.
I noticed that the specs on your latest amp/filter board updated 1/19/08
listed that dc or ac power could be used. My Ver I, rev 1.5 board only
works with an ac transformer. I would like to look at your current power
supply and see if I could convert my board to dc input also.

I would appreciate it if you could send the URL of the power supply
schematic for the current Seismic Amplifier/filter Board you sell.

Thanks- George

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