modification of the BOZ power supply

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kp93300

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Joined 2007
Hello ,
I am a newbie .
I want to build this for a 20 V output by using a 20 V ZD.
Is there any other values to change?
Can i use a BD 139 in place of TIP 29?
Can this circuit work if my input voltage is only 22 V ?

thanks

kp93300
 

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