op amps 1

objective: we have a sensor whose output varies from 0 to +1V and we need to have the corresponding output range from 0 to -10V, and it must draw no more than 1mA

we decided to use 3000ohms and 33,000ohms as our resistors.
we calculate R to be 1152ohms
and Ry to be 105ohms
which makes Rth=230.4ohms

after measuring and recording everything we get

Component	Nominal Value	Measured Value	Power or Current Rating
Ri	1000	976	8th
Rf	10k	9.88k	8th
Rx	1152	1.292k	8th
Ry	104.72	129	8th
V1	12	12.27	2amp
V2	12	12.27	2amp

then we set up the circuit and check the values

Vin	Vout	GAIN	Vri	Iri	Vrf
0	0	0	0	0	0
0.25	-2.79	11.16	0.25	0.08	2.79
0.5	-5.55	10.98	0.49	0.17	5.49
0.75	-8.29	11.05	0.75	0.25	8.29
1	-10.71	10.77	0.97	0.32	10.77

our gain should be by a factor of 10 everytime, however due to the fact that we didnt have access to every resistor possible we had to use a 33000ohm resistor which gave us a gain of about 11

We also measured Iv1 and Iv2 to be .96mA and -1.29mA

We then calculated
Pv1=(.96mA)(12V)=11.52mW
Pv2(1.29mA)(12V)=15mW

Iri=1V/3000ohms=.33mA
and
Irf=10.77V/33000ohms=.33mA
which shows through KCL that our measurements satisfy the condition of using Vin=1V

11.52mW and 15mW are less than 30mW so we did satisfy the power suply constraint. we could increase the values of the resistors to reduce the power drawn from the power supplies.