12V DC to 120/230V AC Inverter circuit with IC 555

This is a DC-to-AC inverter circuit diagram
which produces an AC output at line frequency and voltage. The 555 is
configured as a low-frequency oscillator, tunable over the frequency
range of 50 to 60 Hz by Frequency potentiometer R4.

Parts List:
R1_________ 10K
R2_________ 100K
R3_________ 100 ohm
R4_________ 50K potmeter, Linear
C1,C2______ 0.1uF
C3_________ 0.01uF
C4_________ 2700uF
Q1_________ TIP41A, NPN, or equivalent
Q2_________ TIP42A, PNP, or equivalent
L1_________ 1uH
T1_________ Filament transformer, your choice

The
555 feeds its output (amplified by Q1 and Q2) to the input of
transformer T1, a reverse-connected filament transformer with the
necessary step-up turns ratio. Capacitor C4 and coil L1 filter the input to T1, assuring that it is effectively a sine wave. Adjust the value of T1 to your voltage.

The output (in watts) is up to you by selecting different components.

Input voltage is anywhere from +5V to +15Volt DC, adjust the 2700uF cap’s working voltage accordingly.

Replacement
types for Q1 are: TIP41B, TIP41C, NTE196, ECG196, etc. Replacement
types for Q2 are: TIP42B, TIP42C, NTE197, ECG197, etc. Don’t be afraid
to use another type of similar specs, it’s only a transistor… 😉

Use proper transformer. If you load electronic device which require 120V AC, then use transformer with 120V in output.