An integrator should be in the circuit "somewhere", but there's a lot of creativity available where I left off.
Staying in the analog world alone, you can output the voltage into a 555 Timer, and then have it flash an LED every time the capacitor filled up (and the discharge would also dump the capacitor). For example.
Or you could just wire it up to a microcontroller and busy-loop ADC-convert the input. So you can perform the "integral / summation" in microcontroller / in C-code rather than circuit magic.
The important tidbit is that we've turned 10mA current into a value we can "touch" and use. Hell, maybe the easiest solution is to just hook up a wire somewhere and shove an oscilloscope there to finish things off, depending on how lazy you wanna get.
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I know one professional chip did Opamp Integral -> Comparator (if integral is full, dump the charge to ground. If +V, do register++. If integral was full of negative voltage, do register--).
Then, whenever the register overflowed, it'd generate an interrupt edge on its output (for both overflow or underflow). Alas, I forgot which chip did this. But this way, you could build all your stuff out of 100kOhm resistors, 10nF capacitors, tiny digital logic circuits with micro-amps of power usage that wakes up your microcontroller out of sleep for just a "Current_Reading++" statement on overflow and you go back to sleep. (or current_reading-- on underflow)
But that's all advanced stuff that probably doesn't matter for a student making their first practical OpAmp circuit :-)
Staying in the analog world alone, you can output the voltage into a 555 Timer, and then have it flash an LED every time the capacitor filled up (and the discharge would also dump the capacitor). For example.
Or you could just wire it up to a microcontroller and busy-loop ADC-convert the input. So you can perform the "integral / summation" in microcontroller / in C-code rather than circuit magic.
The important tidbit is that we've turned 10mA current into a value we can "touch" and use. Hell, maybe the easiest solution is to just hook up a wire somewhere and shove an oscilloscope there to finish things off, depending on how lazy you wanna get.
-------
I know one professional chip did Opamp Integral -> Comparator (if integral is full, dump the charge to ground. If +V, do register++. If integral was full of negative voltage, do register--).
Then, whenever the register overflowed, it'd generate an interrupt edge on its output (for both overflow or underflow). Alas, I forgot which chip did this. But this way, you could build all your stuff out of 100kOhm resistors, 10nF capacitors, tiny digital logic circuits with micro-amps of power usage that wakes up your microcontroller out of sleep for just a "Current_Reading++" statement on overflow and you go back to sleep. (or current_reading-- on underflow)
But that's all advanced stuff that probably doesn't matter for a student making their first practical OpAmp circuit :-)