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.