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Voltage-to-Frequency Converter

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km

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I'm having problem in converting square to triangle wave through the AD537 VFC.

Referring to the application notes Figure 28:- **broken link removed**

AD537 has the ability to generates triangle wave through the used of AD521 (Precision Instrumentation Amplifier). However, i built an instrumentation amplifier circuit using 3 op-amps (NE5532P)https://www.ampslab.com/PDF/ne5532p.pdf to replace it. The figure is shown in the attach file.

The problem is i can't get the triangle output that i want. Please help me to check what is wrong? Thank You.
 

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