Electronics > Projects, Designs, and Technical Stuff

variable gain current amp

<< < (8/8)

Kleinstein:
The circuit as shown should work. The FET for switching in the higher value shunt could be a smaller type. For the FET used to switch the small shunt one could consider to swap source and drain. This way the drain to source diode would provide protection for the 1 Ohms shunt in case the current gets too large for positive currents. As shown the protection would be for negative currents.

Alternatively one can get away with 2 FETs for the current (+ 1 inverter): both shunts in series and always measure the voltage over both combined.  1.01 Ohms instead of 1 Ohms may not be a problem and could be corrected with some 100 Ohms parallel to the 1 Ohms if needed.

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod