lab test n°1

• Design an amplifier with a gain of 10V/V that can deliver a balanced signal in the output

common mode signals are trasmitted via a single shielded cable while differential mode signals are transmitted by means of two cables ( in the audio domain they are referred as balanced cables).

in the following links you can find more details

• segnali bilanciati
• balanced and unbalanced signals 
• differential mode and common mode signals 

Connect the device to a voltage subtractor ( i.e. a differential amplifier) and check that the output common mode signal of the resulting system is the input original signal amplified 10 times. Which are the advantages of this system?

• Design an amplifier that can offer a continuously variable gain between -20 and +20 dB.

• Analyse the output signal of the following comparator circuits:

 write a report about your results

monostabili

Monostable multivibrators



Here's a version made with a 555 multivibrator ( please scroll down the page until you find it )  

A monostable made with an operational amplifier ( scroll as above to find it ) 

different tecnologies providing us monostable multivibrators.

After following the links given and reading the contents suggested.

Compare these devices(  try to figure out why you could prefer one or the other depending on the application. )

Design and simulate a monostable multivibrator for each type. The two must have an active output of 300ms.

astabile a operazionali

astabile a operazionali riferendoci alle formule offerte nel link progettare un multivibratore astabile oscillante a 1 khz alimentarlo con +-10V usando il tl 082

adattarlo per ottenere una variazione del duty cycle almeno dal 20% all'80%

SCHMITT TRIGGER lab test n°2

• Build or simulate a Schmitt trigger using an Op Amp (LM741 if possible).
• Measure the characteristics of the Schmitt trigger you made.
• Use a DC power supply of +-10V and set the generator on a 3V amplitude.
• Compare the signals at the point 2 and 1 on the schematics with an oscilloscope.
• Measure the thresholds of the Schmitt trigger  and compare them with the calculated values ( literature is linked below).
• Replace R1 with a 12Kohm resistor and check and explain what happens.
• Change the amplitude of the input to 1V and check what happens.
• Draw the input-output graph for this device.

trigger di Schmitt

schmitt trigger