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voltage inverter:
voltage inverter schematic
click here to enlarge the schematic

U1NE555 timer IC
R11.2k ohm resistor
R23.9k ohm resistor
R31k ohm resistor
C10.05 uF ceramic capacitor
C2, C3220 uF electrolytic capacitor
D1, D21N4002 diode

all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance
this circuit inverts the polarity of the input. output is limited to less that 200mA.
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