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convert voltage to current

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longwen

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In my project, I need a 20 microampere AC current sinewave signal, which is in 10kHz, it is too low, so I want to use the signal generator to generate a 5V voltage sinewave signal, then convert this voltage signal to current signal,
can I just use a 250k ohm resister to connect the singal generator and then get the current signal? if it doesn't work, how can i do it ?
 
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