MC34063电流小改道!

我将5节手机电池芯并联在一起,然后用MC34063制作一个升压电路(见图2)升至9V供电子琴用,可是输出电流才几十毫安!
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R1:1k
R2:6.2K
R:180欧姆
Rsc:0.2欧姆
Ct:1000PF
Co:470uF
电感:47uH

我打算改用图3(见图3)的方案,就是在2脚加一个三极管和电阻.请问这个电阻选择多大合适.三极管的参数有哪些要求,可以选择哪些型号的?
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