July 2021 Updates
1. Updates This Month
A new page on Gas Discharge Tubes (GDTs), with schematic symbols, designators and examples.
Added a new example of a noisy waveform to the Electrical Noise page.
Added a new page (in notes format) on Spark Gaps.
Added info on transient surge waveform specification, including a graph illustration the concept behind 8/20us and similar specifications:
Moved Zener diode info into it’s own page.
Cleaned up many of the schematic symbols on this site for a consistent look and feel:
Added a diagram showing the protection diodes common to most digital CMOS pins.
June 2021 Updates
1. Updates This Month
Combined the "Passing A C++ Member Function To A C Callback" page into the "C++ Callbacks" page. Updated the page with much more info, including worked examples which use https://replit.com/@gbmhunter for hosting, compiling and running small snippets of C++ code.
Updated the Electrical Noise page with info on the various "Colours of Noise" including graphs (in both the time and frequency domains) of white, pink, red, and blue noise.
Added info on Hakko soldering tweezers to the Soldering Irons And Stations page.
Starting testing the Asciidoc format and comparing it against the Markdown format.
Added schematics, equations, worked examples, and bode plots on Capacitance Multiplier circuits.
Removed the "Test And Measurement" section of the site. Moved the only page underneath it (the "Current Probes" page) to under "Tools" instead.
Added a new page on AC/DC Electronic Loads.
Added a new page on Line Impedance Stabilization Networks (LISNs).
The main structure of this sites HTML was updated to use Bootstrap containers and columns to create a responsive layout. At the same time, the main menu was updated from a hover-based tree view to a expandable tree view which should be more friendly towards users with touch screen devices. The Table of Contents for pages is now also added at a fixed location in a right-hand column for large screen devices.
Figure 1. Before HTML/CSS Updates
Figure 2. After HTML/CSS Updates
May 2021 Updates
Added equations/proofs involving the Wien bridge oscillator.
Added diagrams and info on coaxial cables.
Added schematics and simulation results for a JFET gain-limited Wien bridge oscillator.
Added a JFET component to the KiCad simulation library.
Added info on CAN bus mailboxes.
Added a new page on Hashes.
More info added on the MQTT Paho library.
Added a section on Ring Oscillators to the Oscillators page. Added simulation results for a three stage ring oscillator.
Added schematics on a BJT-based astable multivibrator:
Added info on noise power spectral density and noise amplitude spectral density. Added more info about thermal (Johnson-Nyquist) noise including equations and a worked example involving a
\(10k\Omega\)resistor.
Added graphs of a simple moving average (SMA) filter’s frequency response.
Added photos of the vintage 'Micronta Transistor Tester' (a Radio Shack brand) to the BJT transistors page.
April 2021 Updates
Updates to the Python page on asyncio including info and code examples on Tasks and how they are scheduled for execution immediately.
Added info on industry standard package pinouts for op-amps.
Added Win Source Electronics and Microchip Direct to the Electronic Suppliers page.
Added an equivalent circuit model for a crystal (piezoelectric resonator).
More info on crystal resonator operating modes.
Added new page with info on JFETS.
Added info on the Wien bridge oscillator to the Oscillators page. This includes schematics:
and simulation results:
March 2021 Updates
Added a new page on the uSiP Component Package.
Added a new page on Light-Dependent Resistors (LDRs).
Added data on the Early Voltage
\(V_A\)and thermal voltage\(V_T\)to the Bipolar Junction Transistors (BJTs) page.Added schematics and a design procedure for a NPN BJT current-sink whose base is driven by a resistor divider.
Added schematics and a design procedure for a BJT current mirror.
New PlatformIO page.
Updated the size codes on the SMD Electrolytic Capacitor Packages page.
Added info on the hybrid-pi transistor model to the Bipolar Junction Transistors (BJTs) page.
Added a new page on Reliability Engineering For Electronics
Added a open-loop vs. closed-loop bode plot and generalized negative feedback block diagram (with equations) to the Op-Amps page.
Added new page on the TO-99 Component Package.
Added a new page on the Thermoelectric Effect.
Added a new page on the TO-247 Component Package.
Updated the
imgshortcode so that caption text is now rendered as markdown (done by calling the hugo function| markdownifyon the passed in parameter). This allows things such as the ability to add URL links into the image caption, great when referencing the source of the image.Added a section to the Op-Amp page on Negative Impedance Converters (NICs).
Merged the Passive Filters and Active Filters pages into a single new Analogue Filters page and re-organized the entire page.
Added info on the Sallen-Key filter topology.
Added info on four common analogue filter optimizations/tunings (Butterworth, Chebyshev, Bessel and Elliptic).
Added info on overriding the standard library version of
malloc()(and friends) with an application specific version:1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18#include <stdlib.h> int main() { int* i = malloc(sizeof(int)); free(i); } void* malloc(size_t s) { printf("My custom malloc() called"); return NULL; } void free(void* p) { printf("My custom free() called"); }Added info on the MQTT broker Mosquitto and MQTT client Paho.
