Variable Frequency PWM Circuit IRFP064N

R1,R6,R11 = 10K
R2,R9 = 1K8
R3 = 100 ohm
R4,R8 = 1K
R5 = 22K
R7 = 1M
*R10 = 0.003 ohm
R12 = 3K9
R13 = 100K
R14 = 10 ohm/1 Watt
P1 = 20K (Frequency adjust)
P2 = 10K (Duty Cycle)
P3 = 1K (Current Limiting)
C1 = 1000uF, 64V
C2 = 10nF, polyester
C3 = 100uF, 64V
C4 = 22nF
C5 = 47uF, 35V
D1,D2 = 1N4004
U1 = LM7810, volt regulator
U2 = LM324, Op-amp
Q1 = IRFP064N , IRFZ44, etc. MOSFet