This circuit uses the Buck/Boost Converter circuit for typically for use in a lab bench power supply. It features both adjustable voltage AND current using potentiometers. Without a buck/boost converter,a computer power supply can only provide a 3.3V, 5V and 12 supply lines. With the buck/boost converter created with the aid of a 555 timer, adjustable voltage is allowed. A simple transistor is used to increase 555 IC output current. Additionally, acurrent divider is used to create current-controlled current source to create that allows adjustable output current using a potentiometer. This allows both adjustable voltage and current of the buck/boost converter. Hence, a fully-featured lab bench power supply can be built.
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