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  • 2010
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      • VLF Hum Canceller Schematic
        23/03/10


        The schematic in my last post looked crappy, so here's a better one. It's a jpeg, so right click on the image to bring up the larger full resolution version.

        Cheers,

        Keith

      • Hum Cancellation for VLF Receivers
        23/03/10
        I mentioned my trick for mitigating mains noise pickup in VLF antenna/amplifier setups at the SARA Western Conference over the weekend, and many people asked for more details. Here are a couple of pictures and a quick schematic.

        The basic idea is to cancel out some of the local mains ele

      • SARA Western Conference
        22/03/10
        I just got around to uploading my pictures from the SARA Western Conference held at Stanford University last weekend. I had a great time, and I'm sure everyone who attended did too. Bill and Melinda Lord did a fantastic job organizing the meeting, and a special thanks goes to Phillip and Debo

      • Solar Monitor Chassis Progress
        17/03/10


        I've completed most of the mechanical work on the Solar Monitor Chassis. This picture shows the front panel with the core module interface on the left and four completed bar graph modules installed. The upper left control is a lighted push-button switch with an integral yellow LED

      • Striking Sparks
        11/03/10
        Last night was the annual Striking Sparks Awardsgiven by the Sonoma County Astronomical Society (SCAS). This phenomenal program has awarded more than 230 telescopes to promising young scientists in Sonoma County California. This is the 25th year of this program that was started by Robert Ferguson,

      • Solar Monitor Module Tests
        01/03/10

        I finished work on the Core module, so it's time to put a few things together to see if they work as planned. Here you can see the Core module and a Bar Graph board wired together along with a speaker and the transformer. All the functions work as intended, although I decided to make a

    • February