Circuit Project Electronic

This is circuit 300W Inverter power,so input battery 24V to Output 220Vac 50Hz 300W.
I used main Component IC CD4027 , NE555,CA3130 and LM7805. The transistor power MJ15003 driver transformer 24V 10A min. View Circuit
The VR1 - 100K is control Frequency output at 50Hz 50Hz or 60Hz at Square wave signal.
The VR2 - 50K [...]

This circuit will double almost any DC input voltage as well as handling plenty of current. 12 to 24V is just an example. With a few changes, it can also supply any desired output voltage.
There are many possible applications. One I can think of would be to get the 28V for the [...]

The output voltage can be adjusted (varied) from 5v to 24v via a potentiometer connected to the common line of the regulator. The input voltage and heatsinking of the regulator must be sufficient for the output voltage and current. The output may not deliver more than 100mA @ 5v due to the heat produced by [...]