Tag Archives | technology

Harmonic Difficulties With High-Speed Clock

Here I am chasing harmonics to drain them to ground. Literally. This is what I spent time doing today. Set up a draft schematic by happenstance with a strong drink, sunglasses, and music too loud.

See that square wave on the scope? That’s exactly what’s supposed to happen given by the drawing. Only, the waveform is somewhat messy. Too many long leads, unstable harmonics, spurious noises, and other monkey business artifacts going on.

On one hand, it is completely unclear what the specific contributing causes are. Yet, on the other hand, it’s perfectly clear what likely needs the most attention in terms of clean up and the use of the specified reference design’s filters. I can see what’s on the other side before the trial concept is finished.

Stacked Power

By on in Engineering, Research

This power supply generally stacks underneath all SBC modules developed and for those to follow. It is supplied through a 120VAC detachable plug-in to an isolated receptacle. The circuit breaker is protected with bottom-side fische paper to insulate against harmful voltages. The module produces a +/-15V (500mA) and +5V output at 3A. +5V for digital logic module support. +/-15V for analog line level module support.

No power switch, just plug in and go.

4-Channel Signal Relay Board for SBC Modules

By on in Engineering, Research

This is a video walk-through about a 4-channel contact closure relay module I made. An example application is demonstrated here by driving a micro-fan through a relay and connector signal path via a remote and physically isolated contact closure made at an input. There are many applications by which this module will prove both practical and useful.

It serves as a way to achieve a high-current path closure by simply providing a shorted connection at each input.

https://youtu.be/1FgDOD8vWGQ

Signal Interrupt & Ground Lift Board for SBC Modules

By on in Engineering

This is a video that explains the purpose and function of the signal interrupt module. This was the first module I developed and made as an effort to get familiar with KiCAD and other development instruments. It is a simple 8-channel 1:1 input to output signal interface unit that provides for signal interrupt and patch capabilities to external devices. The module also supports micro-patch capabilities from numbered input channels to differently designated channels via patch conductors and to 24-pin connector terminals.