how to Positive(+) to Negative(-) Voltage Inverter

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This simpe circuit will convert the positive input voltage become negative voltage.

Schematic diagram:

Component list:
Part Total Qty. Description
R1 1 24K 1/4 Watt Resistor
R2 1 56K 1/4 Watt Resistor
C1 1 3300pF 25V Ceramic Capacitor
C2 1 47uF 25V Electrolytic Capacitor
C3 1 10uF 25V Electrolytic Capacitor
D1, D2 2 1N4148 Silicon Diode
U1 1 555 Timer
MISC 1 Wire, Board

Notes:

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.
For better regulation, a 79LOxx series regulator can be used.
A zener diode may also be used to regulate the output voltage.

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how to Positive(+) to Negative(-) Voltage Inverter
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