This 12V power inverter circuit can be used to power small power devices that need a 240 volts . This 12V power inverter circuit is very useful when you want to use a 240 volts consumer powered by a 12 volts car battery .
Using this dc motor speed controller circuit designed using 555 timer circuit can be designed a small drill project.
Q1, Q2 and U2 form a variable-frequency pulse width modulator, controlled by U3. Q4 forms part of a step-down power converter.