Author Archives: DP

Building a chaotic oscillator from common components

via Dangerous Prototypes

cpldcpu writes:

A chaotic oscillator is an electronic circuit that can exhibit “chaotic“, nonperiodic behavior. A commonly cited example is Chua’s circuit, but there are many others. I always regarded these as carefully designed, rather academic, examples. So I was a bit surprised to observe apparently chaotic behavior in a completely unrelated experiment.

See the full post on Tim’s Blog.

HDSP clock with SCD5583 display

via Dangerous Prototypes

FlorinC’s HDSP clock with SCD5583 display:

Here is another interesting “intelligent” LED matrix display, whose name actually makes some sense (unlike HDSP-2354, among many others): SCD5583A. I reckon it means: “Serial Character Display with 5x5x8 dot matrix”. 3 is the code is for green (0 for red, 1 for yellow).

More details on Wise time with Arduino blog.


via Dangerous Prototypes

Drive WS2812B LED strips from a PMOD device, a lightdriver project @

I created a PMOD module PCB using KiCAD, that enables connecting WS2812B lighting strips to an FPGA board with a PMOD interface. The board was assembled by JLCPCB.
This is my first project using an FPGA, I plan to soon implement an SPI interface with the FPGA, to accept colour pixels via SPI from a raspberry pi, to then drive the LEDs appropriately. I am making use of the original Zybo board which uses a Zynq FPGA, although I’m not using the ARM portion of this chip as I want to learn VHDL.

Project files are available on GitHub.

App note: 48V buck converter helps MHEVs meet fuel emission standards

via Dangerous Prototypes

Maxim Integrated got you covered on designing all in 48V automotive compliant buck converter. Link here

Ever-tightening automotive fuel emission standards are becoming challenging. The gasoline engine needs the help of an electric motor to meet these standards, leading to the introduction of mild hybrid electric vehicles (MHEV) with higher battery voltages. 48V hybrids are in production today and are proliferating. A 48V buck converter with integrated MOSFETs in an advanced CMOS process helps meet these standards by withstanding high-voltage load-dump transients and operating with low EMI, low duty cycles, and high efficiency.

App note: Surge-proof your industrial sensor

via Dangerous Prototypes

Design solution for a robust and reliable power supply for industrial sensors from Maxim Integrated. Link here

Modern industrial sensors must operate reliably in harsh and demanding industrial environments where they are prone to large surge voltages and mechanical stresses. This places considerable demands on the DC power supply that they use. We consider the merits of different approaches to designing this DC supply, before presenting the most robust, reliable and efficient solution using a uSLIC™ power module.