Presenting here a simple DC-DC converter circuit to power various DC operated circuits. It can provide DC power supply up to 18 volts DC. You can simply select the output voltage by changing the value of the Zener diode ZD. The circuit has both voltage and current regulation.
Input voltage for the circuit is obtained from a 18 volt 500 mA transformer based power supply . You can also use input voltage from a battery.The 18 volts DC from the power supply is given to the collector and base of the Medium power transistor BD139 (T1). Resistor R1 limits the base current of T1 so that the output voltage will be current regulated.
Zener diode ZD regulates the output voltage. Select the appropriate value of Zener to fix the output voltage. For example, if the Zener diode is a 12 volt one, the circuit gives 12 volts DC at the output. Diode D1 is used as a polarity protector.LED provides power on status.
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