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This be inverter circuit the size about 300W .It performs to transform from battery 12V be house electric 220V 50Hz by have signal picture is Square wave. View Circuit And it has the distinction that uses the equipment seek easy, such as integrated circuit NE555 and 2N3055 transistors. request to have fun circuit this idea.
These circuits show methods of changing the operating frequency of astable LM555 timers electronically. Any source that can drive the base of transistor Q1 can control these circuits. The advantage of using this type of frequency control is that the duty cycle of the timer is not affected when the frequency is changed. [...] Read more Source: http://home.cogeco.ca/~rpaisley4/LM555.html
