The slides explain how a voltage inverter can be made using 555 timer in astable mode.
It contains a clear description of the working of the 555 timer and hence the voltage inverter.
3. A power supply is used to convert an
input electrical energy to the required
electrical specifications of a load
In our mini project we have used a
variable power supply….
20. During +ve half cycle:
◦The diode eliminates the -ve DC
component
◦Fed to the –ve potential line to convert to –
ve
During –ve half cycle:
The –ve voltage is let out through the diode
D2 as it is.
Working
21. Overall O/P
Finally the th o/p is got across the 100uF
Capacitor at V0
The o/p is slightly smaller.
22. Calculation
The output frequency of the circuit
constructed is given by the
f = 1.449 / [(4.8+66)* 10^3 * 22 * 10^-6]
f = 1.449 / 1.5576
f = 0.93 Hz
23. Duty Cycle
T on = 0.693(Ra + Rb) C
= 0.693 (4.8 + 33) * 10^3 * 22 * 10^-6
= 0.57629s
T off = 0.693(Rb) C
= 0.693 (33 * 10^3) (22 * 10^ -6)
= 0.593s
24. Advantages
Used to run op amp which requires Vcc
and –Vcc for its working.
Circuits that require both negative and
positive voltages for their working can
incorporate such circuits.
Eg: