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Test & Tools

31 Posts authored by: peteroakes Top Member
  I have been slowly working through a series of projects and tutorials to share and teach how to use various components and how these can be applied to a Home / Lab power supply, DC Load and the likes.   In order to have our first complete tool, I have completed a DC Load to the above specifications and here are the schematics, and pictures in support of the build   First up the schematic Adhering to the classic, It contains a 5V reference IC and a Dual Op-Amp, most of the s ...
The video leading up to this one can be found here Raspberry PI 2.0, Windows 10 and how to drive the DAC8734 from TI (AKA the DAC8734EVM Road test Board), This is the third Raspberry PI 2.0, Windows 10 and how to drive the DAC8734 from TI - Software review This post is a direct result of having issues while trying to get the DAC8734 working on the PI, in previous applications I had written on the PI and with Windows 10 for IOT, I had simply used Mode 0 SPI clocking and it worked without issues ...
Back to the Primary Blog Post for the Modular Bench Power System The Modular Bench Power Supply ++, The Essential DIY Build for Every EE Student and Old Timer alike...   I recieved a few notes regarding the rather poor response times my DC load was achieving so I decided to have a go at improving things   after tuning a few caps etc on the circuit I now have 50uS or so rise and fall times with a 1A shift in load on a power supply, I have also managed to reduce the ringing quite a bit ...
Back tot he Main Modular Bench power System Project The Modular Bench Power Supply ++, The Essential DIY Build for Every EE Student and Old Timer alike...   I keep promising myself I will build an Electronic DC Load and have kept defering it, well no longer, I finally ot it designed and tested on a breadboard and will be following up with a completed unit in a project case   It can go way above 30V (60 to be precice and upto 5Amps), the MOSFET I used the IRFP064 is able to go to 70Am ...
Back to the Main post The Modular Bench Power Supply ++, The Essential DIY Build for Every EE Student and Old Timer alike...   Ok, so based on the last two or three videos an posts it is time to test everything out on the bench with a breadboard and read power to see how it performs   so this is the final schematic I have, I still am pondering changing it up a bit more but I will play with it a little first, ideas I have are around using 10V control signals instead of 5V and of cours ...
Back to the Main post The Modular Bench Power Supply ++, The Essential DIY Build for Every EE Student and Old Timer alike...   So now we will look at how to use integration to control the power stage of a High Power MOSFET and how the response time can be tuned to suite the characturists of your power supply enabling you to adjust the transient response times etc   To be up front about this, I did get some inspiration from studying 30 year old agilent power supply schematics and thos ...
Back to the Main post The Modular Bench Power Supply ++, The Essential DIY Build for Every EE Student and Old Timer alike...   It has been a few months since my last post on the Power supply Project so here are a few in quick sucession   Up first is a view to sensing the Current and Voltage of the PSU using a differential configured OP amp   In the videos I will walk you through the functionality of the design and also demonstrate the curcuit working on the breadboard   S ...
UPDATE Feb 11 2017:- An observant viewer spotted a discrepancy between the code in the video and the code attached/published here. I have now updated it to all match.   In the following two videos we look at the use of a TI ADC and DAC TSSOP-16 chips to extend the abilities (Resolution and accuracy) of the Arduino UNO for use with the Power Supply project   First up the ADC - ADS1220   and now the DAC, DAC8574, Oh and some more I2C debugging with the MDO3000   ...
In this video I use the MDO3000 to figure out where I went wrong in my circuit build, it was a kind Doh moment once I realised the error of my ways but im sharing it anyway   ...
As you can tell from all the videos, im playing catchup, sorry about that   In this video we look at using an Arduino UNO to measure the volts and Amps for a power supply and also have a look at more display options from overseas   As a side note, I was pleasantly surprised at the results of the low cost Volt and Ammeter as well as the Arduino ADC   ...
Again, I have been busy making videos and want them to be available to view, I will be following up with diagrams to go with this in the next little while   In this video I show the basics of a voltage doubler using a classic design but as you will see, there are a few minor issues, I will be following up with an alternative approach if you go ahead with a toroidal transformer for you PSU ...
In this video I look at the options for powering the Modular Bench Power Supply including re-cycled equipment like an old laptop power adapter through to 160VA Toroidal Transformers   I will be adding pictures etc but I wanted to get the video available in the mean time     ...
I have been working with Vishay Precision Group on the selection of resistors for Current Sensing and feedback divider networks for the OP-Amps control stages for my "Power Supply Project",  "DC Load" and "Power Meter", during the conversation I happen to ask about recommendations for resistors to make a Lab Resistor Standard Box for spot checking my lab equipment like DMM's and stated i was going to make a video on the creation of the standard. VPG have an extensive range of resistors ...
Hi Everyone, The holiday season just gets better and better...   I would like to take this opportunity to make a shout-out to Vishay Precision group and in particular Richard who has personally created an excellent Christmas gift for me   I have been working with Vishay or more precisely they have been helping me with my Power Supply Project by sponsoring me through providing various types of resistors needed to make the project a success   Namely the following Numerous Powert ...
I will be putting together the video this week end to go with this schematic but I thought i would share this with you in the mean time VCC can be as much as 40V (I was powering the test circuit on a breadboard with a bench PSU for now set to 30V, my psu max) In the video I will be reviewing the behaviour of this circuit as well as Identifying a few pitfalls (Nothing serious and probably acceptable for a basic PSU but we do want to evaluate where we can improve on things If you think you kn ...

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