I made a 5 port (3 port RS485 and 2 port CAN) earlier that is great, but I want a version that is galvanic isolated for solutions that require wiring around a house or more hash environments. ADM2582E is a “All-In-One” package for this, so using 3 of these I get a 3-port RS485 will…
This diagram illustrate my Home Automation Centre. The idea is to use isolated RS485 networks – no power – to control actuators and sensors. Power will be entered by through RS-X adapters I will draft later. I am a bit undecided on Ethernet/Wifi as this also can be sorted through Raspberry PI. The one thing…
Finally got the shunt resistors (red) and had to increase the width of the board due to their size. I have ordered the PCB’s so we should have them in ca 6 weeks time.
This is the schematics for the regulator side of the Lab PSU. I am using the classic LM723 in this design which allow for current and voltage adjustments through potentiometers. T1 & T2 deliver a max of 15A each, but current will be limited by the shunt resistors R14 & R7 as well as R9…
Reviewing the design for a home automation system I realise that a PLC rack is not optional as a control system centre. The reason is that we will mainly be interested in central node processing and communication – we will not be interested in more classic PLC controls. Also we need these centrals to be…
As we log output voltage, current as well as few other things it would be nice to be able to display a real-time oscilloscope alike picture of these. This functionality is only available on PSU’s far more expensive, but is easy to achieve thanks to the Nextion displays. The illustration below is a draft of…
This metal box is not exactly the prettiest Project Box I have seen, but it cost 17.- USD including P&P and measure 250x190x110mm. I ordered one for testing because the more fancy alternatives cost closer to 100.- USD. What we now miss is the mains adapter with fuse, which is a 3.- USD component. We…
I did not add much capacitors on any of the boards simply because they take to much space + I wanted a separate capacitor board to be able to scale up/Down and be more flexible about mounting them due to their size.. I found some very nice sized 10,000uF/50V that I am using that have…
In part 1 I created an analogue linear regulator that can be used stand-alone as is. But, the drawback with a linear regulator is that it regulate by splitting voltage out between the load and the transistors. This means that if you short-cut the load you have 36V * 10A = 360W heating up the…
I desperately need more lab PSU’s and I have a bunch of LM723 and TIP3055 transistors that are excellent for creating an old-fashioned Linear PSU module. Thinking a bit ahead I want to create the analogue regulator as a small, separate module with knobs on the front, heat-sink & transistors on the back and connectors…