Procedure
and Tasks

The task of this series of experiment is to
build simple but useful circuits.

**Start**:

·
Use your bread
board and follow the instructions of the manuscript

·
connect the OpAmp μA741, the two voltage sources for V_{+}
and V_{-}.

·
define input, output
and ground

**Voltage
divider:**

·
Build a voltage
divider with the resistors R_{1} and R_{2} and a 10V battery on the bread board

**Inverting
amplifier:**

·
Build a voltage
divider with a 10V battery and resistors 100kW and 100W on the same board.

·
Use R_{1}=100W, calculate R_{2} for an amplification of 10 and 100 (since
resistor are only available with 2 digit values choose the closest value).

·
Amplify the
voltage of voltage divider of about 10mV with an output resistance of 100W with the two amplifications.

·
What is the output
voltage? Take notes for the report.

**Non-inverting
amplifier: **

·
Use the same
voltage divider

·
Use R_{1}=10W, calculate R_{2} for an amplification of 10 and 100.

·
Amplify the same
voltage of about 10mV with an output resistance of 100W with the two amplifications.

·
What is the
output voltage? Take notes for the report.

**Ac
amplifier**:

·
Use resistors of
1.8kW and 18kW (100kW)
and a capacitor of
0.1μF for the ac-amplifier (amplification of about 10).

·
The voltage
source is a sinus wave generator with an ac-output of about 1V.

·
Build a voltage
divider with resistors 10kW and 1MW on the same board for the ac-output (reduction by a factor 100).

·
Amplify the
voltage of 10mV.

·
Register on
channel 1 of an oscilloscope the input voltage of 10mV and on channel 2 the
output voltage.

·
Determine the
amplification and the phase relation as a function of frequency at 10, 10^{2},
10^{3}, (1,2,4,7,10)x10^{4} Hz

·
Repeat the same
experiment for an amplification of 100 using 180kW in the
ac-amplifier.

·
Take notes for
the report.

**Follower**:

·
Build a follower.

·
With an
additional battery of 9V and resistors of 100kW and 1MW build a voltage source of 1V with an output resistance of 100kW. follower.

·
Put a load of 100
directly on the output and measure the voltage.

·
Use the follower
to reduce the output resistance of your voltage source.

**Current
source**:

·
Build a current
source.

·
Use a voltage
divider (10V, 10kW, 1MW) for the input voltage and potentiometer of 1kW for the load.

·
Measure the
current as a function of load resistance.

·
Use a voltage
divider (10V, 18kW, 1MW) and measure the current as a
function of load resistance.

**Differentiator**:

·
Use R=100kW and C=.1mF.

·
The voltage V_{in} is supplied by the sinus wave generator.

·
Use a voltage
divider with 1kW and 100W.

·
With the
oscilloscope the input voltage V_{in} is
measured on channel 1 and the differentiated voltage V_{out} on channel
2.

·
Use the
frequencies 10, 10^{2}, 10^{3}, 10^{4}, 10^{5}
Hz.

·
Plot the ratio
of V_{out} /V_{in}
versus the frequency

**Rectangular
oscillator**:

·
Use R=10kW and C=.1mF.

·
Measure the
amplitude and frequency of the output voltage V_{out}
on the oscilloscope.

·
Instead of R=10kW use the values 100kW, 1kW.

·
Make a table of
frequency versus resistance R.

·
Calculate the
expected frequencies.

**Harmonic
oscillator**:

·
Instead of 750W use 405W (1kW and 680W in parallel)

·
Use R=1kW and C=.01mF.

·
Measure frequency
and amplitude.

·
Measure the
resistance of the lamp (during operation).

·
Replace R by 10kW, 100W and
repeat the measurement.

·
Make table

**Integrator**:

·
Instead of the OpAmp mA741 use LF356.

·
Use R=10kW and C=2.2mF.

·
Build a voltage
divider with a 1kW potentiometer, 1MW and a 10V battery.

·
Apply the
resulting voltage to the input of the circuit and watch the output voltage with
the multimeter as a function of time.

·
Adjust the
potentiometer so that the maximum output of about 8-10V is reaches after one
minute.

·
Measure the
resistance of the potentiometer.

·
Measure and plot
V_{out} as a function of time.

·
Register the V_{out}
on the oscillator.

Measurement
of the magnetic field of a permanent magnet.

·
Make a pickup
coil with 20 turns and a known area.

·
Place the pickup
coil between the poles of the magnet and shorten the capacitor briefly.

·
Pull the coil out
of the magnet and measure the integrated voltage.

·
Calculate the
magnetic field.

**Schedule**

First day:

·
Inverting
amplifier with voltage divider

·
Non-inverting
amplifier with voltage divider

Second day:

·
Follower with 1V
voltage source (voltage divider)

·
Inverting
amplifier with follower between voltage divider and amplifier

Third day:

·
Ac amplifier

·
Current source

Fourth day:

·
Measurement of
the impedance of an inductor with sinus generator and oscilloscope

Fifth day:

·
Differentiator

·
Integrator

Sixth day:

·
Rectangular
oscillator

Seventh day:

·
Harmonic
oscillator

Eighth day:

·
Operational
amplifier test