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Above scheme diagram is the circuit diagram of low budget, easy built low power power inverter designed using IC 556 as multivibrator and transistor TIP120 to amplify the signal from multivibrator. To lower or raise any specific voltage is better adapted from a transformer, but this component does not operate in direct current, which is available in battery or vehicle. This is the scheme diagram of 500W power inverter circuit which build using 10 pieces of well-known NPN power transistor 2N3055 to amplify the AC signal produced by multivibrator.
By the circuit composes 2 transistors performs pulse oscillator generator or Square wave generator, for drive the coil transformer have voltage tall about 220V at 50Hz frequencies. Even so the maximum effective would be to make use of a 40 watt tube (or two 20 watt tubes in series).
Which this micro inverter circuit very tiny, acts as convert voltage from the 12 VDC battery to ACV in range of 180V to 220 V-AC, by have frequencies in range of 30Hz to 65 Hz.

Such as a small compact fluorescent, a CD player, a general small radio, as more popular than incandescent bulbs because the light-colored eyes and saves more power. The normally DC to AC converting circuit will include the oscillator circuit, that uses the source voltage is 12 Volts-DC, then drive current through a center trap coil.The transformer should be a difficult saturation core form, to protects a high current flow through to coil.
By uses dual power transistors is a push-pull switching (working alternates) Both transistors should have current gain rates similar, but not necessarily equal Figure 1 The circuit diagram of micro inverter. An one transistor will be saturation point (close circuit) faster than other, to set Q1 close circuit before. The collector current of Q1, Therefore, to create a magnetic field in the.L2-coil then get a base voltage more through a R1-resistor. The Q1-transistor so into the close circuit state fast and making Q2 open circuit faster as well. Therefore, cause current flowing through R1 reduce until not enough makes Q1 is in close circuit state.

Cause the induced voltage polarity is reversed in the secondary coil of transformer, Q2 will still conductor until transformer core to saturation point. The capacitors that drop across the primary coil will make ACV at output smoothing without noise.How to builds For in project use a few components so use how wiring without PCB layout as Figure 2 I suggest some building techniques, as follows. Use a mica insulator insert between case and body of transistor, then use a plastic insulator acts as hold the transistor body with hex nut and metal screw (as Figure 3) Figure 3 The mountiong the transistor in a heatsink2. Joel May 11, 2014 very helpful and informative admin May 12, 2014 Hi, Joel Thanks for your feedback. The LED comes on, the TIP 41`s over heat and there is no output momename June 6, 2015 Hi Des, Thanks your feedback.

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