Pulse width modulation to analogue converter board Most small micro-controllers do not have real D/A converters to produce analog outputs, instead they provide PWM signals that can be converted to ...Read More…
Most small micro-controllers do not have real D/A converters to produce analog outputs, instead they provide PWM signals that can be converted to analog values using an LP filter. This approach is good enough to generate 0-3.3V or 0-5V analog outputs (depending on the logic level of the controller) to control small powered devices, but is not suitable to interface with high power systems, such as VFDs or Servo controllers for electric motors that typically have 0-10V analog inputs and recommend the use of galvanic isolation between the drive and the controller for improved safety.
This board provides the adequate isolation and level conversion to control the speed of two or three separate motors (or other devices) safely and precisely. The board requires a 24Vdc power supply and delivers and output level adjustable between 5V and 12V at full scale, making it directly compatible with most commercial drives. Each channel is totally independent and optically isolated from the other and the controller. When the VFD provides its own “wetting” voltage (typically 10V), the converter can be powered directly from this supply bypassing the internal regulator. In this setting the maximum output voltage is equal to the power supply and no level adjustment is necessary.
The board is fitted with standard 0.2″ terminal boards and can be housed in a commercial plastic enclosure with DIN rail mounting for easy addition to electrical control cabinets.
Each channel is totally independent, therefore they can be connected to different controllers (if required). The same applies for the outputs.
Can be purchased through distributors or online:
FOR 2 CHANNELS VERSION
FOR 3 CHANNELS VERSION
The boards are available in Kit or fully assembled and tested. The kit can be assembled in 20-30 minutes and requires only basic soldering skills thanks to the use of through-hole components and the instructions included with the shipment.
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Canada Post: Small parcel air
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My name is Domingo Hernández but some people prefer to call me MUZA ( or TUTAN, VARGUARD, SPARKS, LOCATIS etc.) so I chose the shortests for this site.
I am an Automation Engineer with over 4 decades of field experience in many industrial projects located around the world with special emphasis in the development of custom electronic devices for assembly and production lines.
Since my beginnings in the early 70´s the technology has changed so fast that it will be preposterous to say that I have been able to keep the pace of this revolution, thus I am not a specialist in any modern tecno gadgetry such as internet, UAVs or social media. What is left is some practical knowledge of how to solve specific problems, specially in the field of automation. This includes bits of expertise in the design of analog and digital devices ranging from DC instrumentation amplifiers to automated test jigs going through motion controllers and vision systems, all of them built with whichever technology was available at the time (discrete logic, micro controllers, PC, PLC, and the like). Along the way I learned how to put those contrivances to work using different programming languages none of which I ever mastered enough to call myself a software specialist. So they call me a “generalist” which I translate faithfully into “jack of all trades, good for nothing”.
Officially “retired” since late 2013 I am now actively working in several small automation projects in Europe, although I live in Canada, thanks to the incredible tools provided by internet (video conferencing, remote control, etc.). The companies I work for are not big ones with fat budgets for R&D; in fact the opposite is true, meaning that the development cost as well as the price of the final product must be reasonably low.
One positive result of this low-budget environment is that all final devices are low-cost and I thought that they may be useful for a wider community of DIY’s. The goal of this site is to sell them at an affordable price and help the users to use them to their satisfaction.
I expect to have only a few products available for sale, although some more will be added as new projects are completed. Also I am open to suggestions to modify existing designs to improve their performance or suitability for specific applications or develop new ones that may fill an existing gap (in fact, that’s what I usually do all the time!).
You are welcome to look around, ask questions, leave suggestions and, eventually, purchase anything that suits your requirements.