if tip122 is "on" it will provide the power supply for ic 3525A, and ic 3525A operate, control Irf631. but when i provide the power supply 33.9V for tip122 by R=6.8k, tip122 still silent, the voltage = 0v, the current = 0v. i mean if tip122 is "on" the voltage between pin Base and pin Emiiter of tip122 must be 0.6v. im trying to find out the mistake of this part!because this is the power supply block of the big circuit. the big circuit is control the lcd & the keypad like the picture i attached.thank all!