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THX I try this tomorrowAdd a 100pf cap from output to (-) of U1.
Break connection from U2 out to U1 in(-). Now add 10k resistor to get the connection back.
The new RC slows down the error amp U1. It ts too fast and too much gain.
But I need a circuit with low Rr voltage drop (Vcc = 5V) and with high Vin voltage to set the current (from 0 to 4V).Here is a much simpler circuit:
View attachment 71281
If you use an op amp with rail-to-rail I/O, it should work.THX I try this tomorrow
But I need a circuit with low Rr voltage drop (Vcc = 5V) and with high Vin voltage to set the current (from 0 to 4V).