ampere will be around 100mA and with 9V it will be around 150 to 200mA and with 12V it will be around 250 to 300mA. When operating with 12V the transistor BD139 will dissipate heat therefore required a suitable heatsink. The output voltage of the circuit can be selected with the 5K variable resistor.
The circuit is divided in to two parts, the first part is a DC to DC step up converter / booster circuit built around a 555 timer IC which boosts the input voltage to around 50V. The second part of the circuit is an adjustable power supply built with LM317 adjustable voltage regulator IC. The 39V zener diode is used to step down the voltage coming from the booster circuit to convert it under the max input voltage limit of the LM317 IC that is 40V DC.
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DC TO DC Adjustable Step UP Boost Power Supply /
Converter
This article describes a DC to DC adjustable step up boost power supply / converter circuit. The output of the circuit can be adjusted from 1.2V to 37V DC, the output current of the circuit is 100mA to 300mA depends on the input power supply or voltage, like with 6V input voltage the max output
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