inverter 12v to 220v 1000w by transistor

[postlink] https://freetube-video.blogspot.com/2018/07/inverter-12v-to-220v-1000w-by-transistor.html[/postlink] http://www.youtube.com/watch?v=hPEbVkUWmAAendofvid [starttext] Figure 1 Circuit diagram of Inverter 12V to 220V 1000W by Transistor

From the schematic diagram in Figure 1 this circuit will include of 4 main section are:
1. The transistors Q1,Q2 act as the frequency oscillator circuit.
2. Both transistors Q3,Q4 act as the frequency divider circuit
3. The Q5,Q6 act as the driver circuit.
4. The Q7,Q8 act as the output circuit.

Let’s look at to both transistors Q1,Q2 will be connected together as the astable multivibrator form. It will generate the output frequency about 100 Hz at the collector lead of Q2. Then this signal will sent to the two frequency divider makes the frequency is reduced down about 50Hz

Cause we don’t design the circuit to directly work at 50 Hz. Because the generating the steady low frequency is very hard.

The output from divider circuit is sent to base of Q5,Q6. To increase current up to drive the output transistors Q7,Q8, then drive the transformer, finally to supply load.
Note:
1. Normally, use the 2-3A transformers for 20-30watt for the incandescent lamp. But use need 100watt use must use 8A transformer so expensive for me.
2. The primary coil of transformer use may use 9V CT 9V or 10V ct 10V or 12V ct 12V.
Which normal I use 12V ct 12V makes the output voltage about AC 220V (no load). But there is load voltage will reduce to AC190V
3.This circuit will has output as square wave form. So cannot use for inductor load.

4. This transformer, we may use secondary coil is the output voltage as you need, example we connects to the power amplifier that use AC 24 volts so we use AC 24V secondary coil etc. [endtext]