Servo pulse to PWM converter parts list:
C1,7,8,9 - 0.1 uF capacitor
C2,3,5,6 - 0.01 uF capacitor
C10 - 47 uF capacitor
C4 - not used
D1 - generic diode(1N4148, 1N914)
J1,2 - 3 pin header or other connector(optional)
R1,6,7,9,12 - 100k resistor
R2 - 100k trimmer potentiometer
R3,13 - 10k resistor
R4 - 4.7 megohm resistor
R5 - 220k resistor
R8,14,15 - 47k resistor
R10,11 - 15k resistor
U1 - 74C14 or other CMOS hex schmitt trigger(MC14584, CD 4584, CD40106)
U2 - LM324 quad opamp
U3 - CD4066 quad analog switch