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Saturday, May 24, 2008

555 DC-AC Inverter

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

This DC-to-AC inverter schematic 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.
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... ;-)

2 comments:

techtalk said...

I think using center tapped transformer is much better because it doesn't need large cap C4, you can drive directly the primary winding with push-pull transistors. You can use a standard center tapped step-down transformer as a step-up transformer by using it's secondary winding as the primary.(hamuro, www.vidisonic.com)

s ngcebetsha said...

I WOULD LIKE TO KNOW WATH COMPONETS CAN I USE INSTENT OF L1AND C1 IN OTHER TO GET A SINE WAVE,AND ALSO WHICH COMPONETS CAN I REPLACE WITH WATH COMPONENT IN OTHER FOR TO GE 200WATTS AS AN OUTPUT POWER