Astable circuit with op-amp to control high and low times and voltages

[mfecky]

Hi every one, i want to design astable circuit using op_amp and i want control TH ,TL,VH and VL

for example VH=x ,VL=y (x,y ara variables which i can cotrol them )
TH=m , Tl =n (m , n ara variables which i can cotrol them )

using multisim or any simulation program

 

[KingNothing]

What are TH, TL, VH and VL?

 

[mfecky]

VH ,VL(high,low output voltage)

TH,TL (time charging and discharging)

 

[mfecky]

i will be grateful if u help me