Month: February 2021

  • Measuring Amplifier AC Impedance

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    Knowing the impedance of an amplifier or any electronic circuit can be very useful, for lower frequency applications it’s desirable to have the source impedance be much lower than the load impedance to minimize voltage drop, in RF applications and where maximum power transfer is needed it’s better to match impedance to avoid reflections, the…

  • Securing a SSH Server

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    Secure Shell is a prime target for any attacker wanting to gain access to your machine, the default configuration is reasonably secure, but there is plenty of room for improvement, this is particularly important when setting up a machine for the first time over SSH, attacks can and do occur within hours so securing it…