#232

[@IanScottJohnston]

Love the home designed perf board components. What are you using for the on-screen DMM readouts?

[@TheEmbeddedHobbyist]

I'd love to say it was was my own code, but while I was working on my own Rs232 driver for the HP34401A I came across this which was created by Niravk patel It still throws the odd error on the meter but not as many as I was. I could not get the refresh as fast as he does. It was on the EEVblog forum. github.com/Niravk1997/HP-Agilent-Keysight-34401A-Control-and-Data-Logging-Software Forgot to say the perf board was cut on my K40 laser, the board mounts on my Ender 3, and the components out of my odds and sods bins.

[@andymouse]

Nice little demo ! interesting what you said about resistors, I had never thought of it like that. Very interesting all around......Squeak!............cheers.

[@TheEmbeddedHobbyist]

Thanks Andy. glad you found it interesting. there is an a error in the video I'm not sure if I should wait to see if anybody does the calculations and spots it or own up and put it in the description. :-)

[@andymouse]

@@TheEmbeddedHobbyist I don't do the sum's when watching so if it's a decimal point wrong or something of that nature I wont catch it, but it was a great refresher all the same so Squeaktastic !!

[@AJB2K3]

How on earth did you discover this?

[@TheEmbeddedHobbyist]

Used current mirrors in the past but with dual transistors, where they are matched and on the same die so don't suffer from temperature differences as you do with using two separate ones. But a fun little circuit to add to the kit.

[@AJB2K3]

@@TheEmbeddedHobbyist It is an interesting little circuit and one I'm adding to my book with credit to you!

[@TheEmbeddedHobbyist]

@@AJB2K3 great to hear that Adam.

[@AJB2K3]

Its almost an astable multivibrator

[@TheEmbeddedHobbyist]

Not sure there, but you could use it in place of a resistor to control the discharge to ground of a timing capacitor.