Design Astable Circuit with Op Amp | Control TH, TL, VH & VL

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The discussion focuses on designing an astable circuit using an operational amplifier (op-amp) while controlling the variables TH (time high), TL (time low), VH (high output voltage), and VL (low output voltage). Participants seek clarification on the definitions and roles of these variables in the circuit design. The use of simulation software like Multisim is suggested for testing and visualizing the circuit's behavior. The goal is to achieve precise control over the output voltages and timing intervals. Assistance is requested to better understand how to implement these controls in the astable circuit design.
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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
 
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What are TH, TL, VH and VL?
 
VH ,VL(high,low output voltage)

TH,TL (time charging and discharging)
 
i will be grateful if u help me
 
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