A circuit is required to provide an adjustable voltage. The specifications for the circuit are:
• It should be possible to adjust the voltage to any value between -5 V and +5 V
• The load current should be negligible
• The circuit should use as little power as possible The available components are:
• Potentiometers: resistance values of 10 kO, 20 kO and 50 kO
• A large assortment of standard resistors (2%) having values between 10 O and 1 MO (check the list of standard values published in the course webpage).
• Two power supplies (voltage sources), one 12 V supply and one -12 V, both rated at 100 mA (maximum)
Hints:
a- The adjustability of the potentiometer can be used to obtain an adjustable output voltage
b- Both power supplies must be used so that the adjustable voltage can have both positive and negative values
c- The terminals of the potentiometer cannot be connected directly to the power supplies because the maximum allowed voltage is ± 5V