Living Analog

- May 04, 2012

Living Analog is a look at the analog aspects of everything electronic including amplifiers, sensors, power supplies, optics, RF, microwave and even digital circuitry, with every anecdote being taken from real life events.  Replies and comments are cordially invited.


MIL-STD-704 simulation on the cheap

  • 06.15.2017

MIL-STD-704A defines voltage transients which can appear on a +28V DC line. You can use an inexpensive test fixture to loosely mimic that DC level and those transients. Read More...


Embedded resistance measurement

  • 06.12.2017

Assume that you have a resistive tee network embedded in an impenetrable potting material and you want to make a direct measurement of the value of one of those resistors. Since you can't access the center node, the other resistor(s) would seem to make that an impossible task, but it can be done.Read More...


Limitless gain

  • 06.02.2017

This engineer built a linear amplifier to work with very low level input signals at approximately 40 kHz, with the operating frequency of an ultrasonic transducer, and lots of gain at very low cost and with assured stability. Read More...


Dielectric constants

  • 04.27.2017

The goal here is the use of capacitive sensors to detect the presence or absence of these materials in a production environment. This has nothing at all to do with the construction of electronic components. Read More...

Cheap sweep

  • 04.26.2017

Make a really low-cost swept frequency tone generator using just some spare op-amp sections and no sole source parts. Read More...

Slippin' and a slidin'

  • 04.04.2017

Mechanical potentiometers can develop intermittent slider connections; adding a shunt resistance keeps the output predictable. Read More...


Space vectors

  • 04.03.2017

If there is a vector in collision with the rail voltage limit, that is bad news, but we can mitigate that if we dynamically move the vectors up and down as shown here. Read More...

Der alte battery

  • 03.22.2017

What are the chances of a battery getting really old and thus achieving the status of "der alte battery"?Read More...


Doubled-up MOSFETs

  • 02.25.2017

In this circuit, a single event upset will momentarily upset the transformer drive balance a little, but it won't allow a potentially catastrophic pull down on the +Vcc rail because the companion MOSFET of the affected one sustains the intended switching. Read More...


Inverted mode switches

  • 02.12.2017

Certain types of discrete transistors can be operated as inverted mode switches where "inverted" means that the collector is made to serve as an emitter and the emitter is made to serve as a collector. Read More...


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