Welcome to my guestbook, where you can see what previous visitors think about this site and my projects and articles. Many thanks to everyone who has left messages - your feedback really is appreciated!

Guestbook entries from 2019 (7)

    • cliff
    • Canada
    • 12 December, 2019

    The clearest intro tutorial to op-amps that I have ever read! great!

    • Anastasios
    • France
    • 6 November, 2019

    Your site is the most insightful, exciting read since Douglas Self's Small Signal Audio. The breadth and depth of knowledge here is awe inspiring and plain inspiring. Thank you so much for sharing and keep up the great work.

    • Ciro
    • Brazil
    • 16 August, 2019

    Mark, thanks for your effort to keep this site up and running and your time providing us very nice reviews. I was looking for a new multimeter and Google brought me to your reviews. As a fellow engineer and tinkerer, I share your interest in diy projects in my (scarce) spare time. Best wishes and good luck.

    • Peter Berry
    • Cornwall
    • 10 August, 2019

    Arrived here whilst looking for review of multimeters. A pleasant surprise to find a simple impartial informative site full of items of interest. The Hi fi section especially, I too have the Thornes 125 Mkii with SME and Shure V15, purchased way back in the 70s and still performing, with the Sugden C51 P51 amp combo among others. Great site.

    Best regards,
    Peter Berry.

    • James Struble
    • Kansas City, MO, USA
    • 2 May, 2019

    Thank you, your site has brought life back to my A1.

    • Ray Dart
    • Beds
    • 24 March, 2019

    Really interesting and useful article (I found by accident when searching for information about the AF116). Thanks.

    • Carlos
    • Brazil
    • 4 January, 2019

    Congratulations on the great site, with well documented information, approach to useful equipment, good vintage blending to microprocessors. I really enjoyed the review of the AD584 voltage reference kit. I wish you success in your life and accomplishments.