hi K7elp60:
sorri to bother you ! the 3rd question is that: instead of using a regulator i applied a +5V to the 10K fixed resistor then on the other leg i connect a 10K variable resistor (instead of potentiometer) then after the variable res. , connect it to gnd (series connection). then i calculated the small resistance res. (i used 1.2 ohms as i need ard 2A for my circuit).after calculating, i connected it to the source and then together with the whole circuit(the non-inverting i/p of the op amp series with a 1K res.) , i connect the circuit to the variable res. with respect to the gnd. i would like to ask that by varying the resistance of the variable resistor, i would change the value of the discharge current (drain current), am i right? then the 4th question is that i did a testing on the circuit that i built, instaed of using the batt, i used a power supply to act as my batt then i set to ard 12V. for the op amp part, i connect two independent pwr supp in series (set to ard 10V each) then 1 terminal is +10V, i connect to the vcc+ i/p of the opamp then the other terminal is -10V, i connect to the vcc- i/p of the op amp (i did not do anything to the other i/ps eg.offset null 1,2 , ..). then i switch on the power supplies and the pwr supp acting as the batt seems to be nt working(no voltage reading shown on the meter) and onli when i boost up the current of the pwr supp acting as the batt, then there will be voltage reading and the low resistance resistor will get burnt.
sorri to bother you ! the 3rd question is that: instead of using a regulator i applied a +5V to the 10K fixed resistor then on the other leg i connect a 10K variable resistor (instead of potentiometer) then after the variable res. , connect it to gnd (series connection). then i calculated the small resistance res. (i used 1.2 ohms as i need ard 2A for my circuit).after calculating, i connected it to the source and then together with the whole circuit(the non-inverting i/p of the op amp series with a 1K res.) , i connect the circuit to the variable res. with respect to the gnd. i would like to ask that by varying the resistance of the variable resistor, i would change the value of the discharge current (drain current), am i right? then the 4th question is that i did a testing on the circuit that i built, instaed of using the batt, i used a power supply to act as my batt then i set to ard 12V. for the op amp part, i connect two independent pwr supp in series (set to ard 10V each) then 1 terminal is +10V, i connect to the vcc+ i/p of the opamp then the other terminal is -10V, i connect to the vcc- i/p of the op amp (i did not do anything to the other i/ps eg.offset null 1,2 , ..). then i switch on the power supplies and the pwr supp acting as the batt seems to be nt working(no voltage reading shown on the meter) and onli when i boost up the current of the pwr supp acting as the batt, then there will be voltage reading and the low resistance resistor will get burnt.
