Electronics > Projects, Designs, and Technical Stuff

Laboratory Amplifier

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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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