I want to make a Current Source with only Resistors, Capacitors, Inductances and Opamps(Not diodes or transistors) all biased by a Cell Phone Charger(5 VCC Supply) and get at least 2 mA. So I found the circuit attached, since I don't have any IC Differential Amplifier I tried replacing the gray squared part of the circuit(Differential IC) with a general purpose OpAmp and the same arragement of resistances, but in both Pspice Simulation as in breadboard the results were unfruitful, the current varied a lot with low Load Resistance changes. I have used and simulated: LM741, LF353, LM324 and TL082.
Any idea of a general Purpose OpAmp that I could use? Or a Differential OpAmp IC with all it's resistors matched?
Thanks.
Any idea of a general Purpose OpAmp that I could use? Or a Differential OpAmp IC with all it's resistors matched?
Thanks.
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