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Digitally controlled current source to be used with PIC16F

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chandanagalle

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Hi,
is there a digitally controlled (TTL or CMOS) current source chip (or circuit) which can deliver precision constant current programmable from 0.1mA to 5mA.
I am using PIC16F877A microcontroller to output digital values as input to the current source.
Please please please help me.
 

Re: Digitally controlled current source to be used with PIC1

try connecting the pic to digital to analog converter -dac08 and you will get digitally controlled current source.


avi.
 

Re: Digitally controlled current source to be used with PIC1

Hi chandanagalle

Try a simple R/2R DAC on PIC port
Monitor output voltage across a sense resistor by PIC A/D
Feedback and correct in software =>> basic proportional control system

Polymath
 

Re: Digitally controlled current source to be used with PIC1

Maybe this project will show you some ideas:

It is a PIC-controlled 4-20mA tester ..
(PICAXE18 <=> PIC16F88)

Regards,
IanP
 

Re: Digitally controlled current source to be used with PIC1

try using a dig pot on the base of a transistor to control the emitter current. Control the dig pot using the microcontroller.
 

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