4/6/2023 0 Comments Macspice all voltages negative![]() And, sadly, while I'm no better at it now, at least I stuck my toe back in the water and I can jump in when it comes time to build an oscilloscope calibrator. I haven't actually built anything in an enclosure in 15 years or more. ![]() So despite some challenges met with kludges, I'm fairly happy with the results. I swapped out the LM258N Op Amp for an LM1458CN which apparently has a faster slew rate as the trace is substantially cleaner than the one generated by the 258. Note that this isn't my idea, but rather came from this Sparkfun Tutorial. The plastic standoffs are glued to the case with Sure Hold Plastic Surgery. The PCB is mounted with plastic standoffs from Radio Shack. Then I figured why not dress the thing up with a brass insert.Ĭlearance for the switch and the BNC connectors is pretty tight and I had to saw out some unused parts of the PCB to get it to fit. To cover the mess I made, I used a larger power switch that covers up the original holes. Everything was wrong with this attempt (the picture doesn't even begin to convey how bad it turned out). I cannot cut square, straight, correctly sized holes without better equipment and more patience. My first attempt to install a slide switch on the top failed miserably. I gave up on that one and decided to part it out. ![]() The BNC connectors come from one of the accursed Global Specialties 2002 function generators that I have been trying to get working. It has a removable front panel, a sliding battery door to fit AAs or 9V batteries, and is sizeable enough to fit my various Radio Shack prototype PCBs. I like this box a lot and will probably order several more. It's a tight fit inside that Hammond 1593 project box from All Electronics, but it works. << My first prototype of the mini function generator is now officially done.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |