I was thinking about some Panduit modular patch panels, but never bought it. So just left it.
PakaHuszar
All about my DIY electronics projects
2023. szeptember 16., szombat
Building my rack(s)
I was thinking about some Panduit modular patch panels, but never bought it. So just left it.
2023. szeptember 5., kedd
Fluke 787 "Repair"
"i purchased this at an estate sale. i don't know if it works or how to turn it on. but as it is right now i have pushed every button and nothing comes on the screen. so because of that i am selling it for parts or repair."
2023. augusztus 27., vasárnap
Dumpster Dive - "woodwork"
2023. augusztus 22., kedd
Photography
There is some (re)addition to my hobbies.
A few years ago (mainly at the film based era), I was seriously involved in the amateur photography. Went nowhere without an SLR camera. A few years ago, this swept away a bit. There are many reason behind it. I guess the main reason was the better and better cameras in the smart phones.
Anyway, I was never completely satisfied with the performance of it. It was good for documenting my electronics projects but... It was good for my daily needs but...
Then the COVID came. It bring with it a closing down the things. Working in IT with cloud technologies bring almost zero need to go to into an office. My main hobby (still will be) electronics is connected to my lab, what is a closed space. Actually days passed by without going out to the street.
It looks like two and a half year was the limit to me to be able to tolerate this kind of lifestyle. Enough.
So a few weeks ago, I took out my photo equipment from the locker and started to use it. With it, go out to the city, to countryside, just for taking pictures. I love this feeling.
I also plan to move from phone to this equipment also for other photo/video related activities. For this plan, I started to upgrade my set a bit. It doesn't mean buying new equipment. Much more started to collect 2nd hand tools. Added an FX camera (Nikon D610) to be able to utilize the lenses from my film era. Added macro lenses for my object photography goals.
The current set:
My new photography journey starts here.
2023. június 28., szerda
Keithley 2700 - Repair 2.
2023. június 13., kedd
2023. június 12., hétfő
Reference Resistors
A friend of mine asked me for a quick project (finally it become not so quick, but just because the time it required the parts to arrive).
He is installing pool and other water handling related systems. One of the pool measure system has PT100 temperature sensor input what need calibration. The proper calibration equipment cost a fortune. Actually he only need two reference point. For this he asked me to make some reference resistors in a box what is precise enough and has low tempco.
The values are 100 ohms and 119.4 ohms what is weird a bit. Looked around and find the required resistors in 0603 and 0805 size (100 and 120 ohms 0.01% 2ppm) around $10 each. For the 119.4 ohms I planned 24k in parallel with the 120 ohms (bit less precision as there is not needed better).
I bought some tiny aluminum boxes from the AliExpress. The idea to change the front plate of the boxes to a PCB add the screw-in banana sockets and put the resistors to the back of the boards.
It looks like this:
It was manufactured by PCBWay in the usual excellent quality - Thank you!
I was a bit afraid, if they can follow my request and put the order number to the already crowded component side, but it was managed without problem. It arrived together with my VFD project board, what I'll write about later.
The board soldered (Yes, it is a joke. Only one single resistor in this case)
Some measurements
If I count the cable and the plugs contact resistance is the result get even better. I'm satisfied with the result.
And the final boxes (the request was about two units.
I put two resistance values into a single box. The only thing left is to print some labels on it with the values.