555 timer circuits with explanation

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 .

This capacitive touch sensor switch is designed using 555 timer circuit and some common electronic components.

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.