Electronics > Projects, Designs, and Technical Stuff
DIY electronic load troubleshooting
bogdan2014:
Done. What exactly is the purpose of the resistor from the shunt to the - input?
Kleinstein:
The principle circuit looks OK, but the capacitor can be smaller, more like 1-3 nF.
The resistors form the shunt together with the capacitor in feedback set the cross over between where the feedback is directly from the OP and where the feedback is from the shunt. The cross over should be at a frequency considerably lower than the time constant of gate capacitance and 100 Ohms resistor at the Gate. It should usually also be lower than the OPs GBW.
bogdan2014:
Great, thanks! I'll come back with the whole thing done.
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