### Author Topic: circuit of precision 1A current source, how thus this circuit work?  (Read 2798 times)

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#### Audioguru

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##### Re: circuit of precision 1A current source, how thus this circuit work?
« Reply #25 on: June 10, 2018, 04:13:04 pm »
The datasheet for the TL082 opamp shows that it has two opamps in it. The unused opamp might be interfering with the opamp in it that you are using. Use a single opamp instead.
The datasheet for the TL082 opamp also shows that its Common Mode Input Voltage Range is 4V more positive than its negative supply voltage so its inputs DO NOT WORK if their voltage is less than +4V in your circuit. The TL08x opamps have the Phase Inversion Problem then its output will go as high as it can if an input voltage is within a few volts from 0V in your circuit. It needs an additional negative supply of -3V or more.

Instead you could use an opamp that has inputs that work as low as +1V in your circuit.

The following users thanked this post: aidilismadi

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##### Re: circuit of precision 1A current source, how thus this circuit work?
« Reply #26 on: June 15, 2018, 06:41:42 pm »
thank you for the help

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##### Re: circuit of precision 1A current source, how thus this circuit work?
« Reply #27 on: June 27, 2018, 07:13:43 am »
thank you so much for the info

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##### Re: circuit of precision 1A current source, how thus this circuit work?
« Reply #28 on: June 27, 2018, 07:23:12 am »
heyy everyone thank you so far for the helping

this is the result of the non-inverting input.
1 did get 1.082 for the input.

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##### Re: circuit of precision 1A current source, how thus this circuit work?
« Reply #29 on: June 27, 2018, 07:27:27 am »
i do have a problem regarding the connection of om-amp to the dc dual power supply. i really appreciate if u guys could show me the explanation and how to the om-amp be functional in that connection.

Smf