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
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.
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.