Electronics > Projects, Designs, and Technical Stuff
Laboratory Amplifier
MaxFrister:
The board is in the mail -- or at least on a slow boat. It is hard to complain about 10 boards for $11 delivered.
I made a few more tweaks to the layout and added more resistors to allow for calibration. I'll post an update in a few weeks or months after testing.
I may very well leave RV101 off the board if it does not seem necessary or helpful.
MaxFrister:
I finally got around to putting this in a chassis. For power I was able to recycle a defective torroidial transfromer from my Datron 1081.
The amp performs mostly as expected. There were some issues with pcb footprints. The LF411 is too slow so I did not reach my design bandwidth of 100Khz at +46dB. The front end is wrong; my attempt to make it symmetric around ground is incorrect. Right now, neither AC coupling nor oscilloscope probe compensation work as intended.
I probably should add some labels to the controls.
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