This is a simple design for inverter that produces voltage. This circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components. This is the figure of the circuit.
V+ can be anywhere from 4 to 16V. -V is one volt less than V+. So for -12V output, use +13V input. The maximum current output of the circuit is about 280mA, more than enough for a few op amps. A zener diode may also be used to regulate the output voltage. For better regulation, a 79LOxx series regulator can be used.
Part:
R1 24K 1/4 Watt Resistor
R2 56K 1/4 Watt Resistor
C1 3300pF 25V Ceramic Capacitor
C2 47uF 25V Electrolytic Capacitor
C3 10uF 25V Electrolytic Capacitor
C4 100uF 25V Electrolytic Capacitor
D1, D2 1N4148 Silicon Diode
U1 555 Timer
MISC Wire, Board
V+ can be anywhere from 4 to 16V. -V is one volt less than V+. So for -12V output, use +13V input. The maximum current output of the circuit is about 280mA, more than enough for a few op amps. A zener diode may also be used to regulate the output voltage. For better regulation, a 79LOxx series regulator can be used.
Part:
R1 24K 1/4 Watt Resistor
R2 56K 1/4 Watt Resistor
C1 3300pF 25V Ceramic Capacitor
C2 47uF 25V Electrolytic Capacitor
C3 10uF 25V Electrolytic Capacitor
C4 100uF 25V Electrolytic Capacitor
D1, D2 1N4148 Silicon Diode
U1 555 Timer
MISC Wire, Board
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