Electronics > Beginners
circuit of precision 1A current source, how thus this circuit work?
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ogden:

--- Quote from: Hero999 on March 15, 2018, 08:28:56 pm ---That circuit can be very difficult to stabilise. It's very easy for it to oscilate. I'd recommend a Darlington transistor, such as the TIP121, rather than a MOSFET.

--- End quote ---

No need to change transistor. You can add capacitor to opamp feedback loop. In current sink/source application you can overcompensate overstabilize circuit heavily because most likely fast response of regulation is not required.

Note 100pf capacitor:



Circuit from Linear appnote 105

Further reading about opamp compensation stabilization
aidilismadi:
thank you for the recommendation
aidilismadi:
thank you for the recommendation. sorry to bother again, thus the v+ on mosfet connected with same voltage as the amp-omp dc source. in this circuit what is the preference dc source on v+ and vin.
Gyro:
Is this just a theoretical question or do you have some specific application in mind? If so, it may help to give you more specific advice.
aidilismadi:
sorry to bother again, i  clearly had a few problem with the circuit. can u guys give an opinion on the basic connection. if there is a problem with the dc supply to the mosfet or the ideal dc supply volt to the mosfet. the second one is why the dc supply on the om-amp did not give any current supply. thank you.
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