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Icy
Icy
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YouYour title is misleading - there is no bistable multi-vibrator in the circuit.

The circuit diagram as drawn has the op-amp shown with positive feedback, in this configuration it is a Schmidt trigger, which would give the output you want.

However, you have constructed the circuit with the +/- inputs (pins 2 and 3) the wrong way round - giving negative feedback. In this configuration the op-amp acts as a linear amplifier with a gain of 2 (1 + Rf/Rg) instead of acting as a Schmidt trigger which you intended. The circuit diagram is correct.

Your title is misleading - there is no bistable multi-vibrator in the circuit.

You have constructed the circuit with the +/- inputs (pins 2 and 3) the wrong way round. In this configuration the op-amp acts as a linear amplifier with a gain of 2 (1 + Rf/Rg) instead of acting as a Schmidt trigger which you intended. The circuit diagram is correct.

Your title is misleading - there is no bistable multi-vibrator in the circuit.

Your title is misleading - there is no bistable multi-vibrator in the circuit.

The circuit diagram as drawn has the op-amp shown with positive feedback, in this configuration it is a Schmidt trigger, which would give the output you want.

However, you have constructed the circuit with the +/- inputs (pins 2 and 3) the wrong way round - giving negative feedback. In this configuration the op-amp acts as a linear amplifier with a gain of 2 (1 + Rf/Rg)

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Icy
Icy
  • 2.2k
  • 11
  • 16

You have constructed the circuit with the +/- inputs (pins 2 and 3) the wrong way round. In this configuration the op-amp acts as a linear amplifier with a gain of 2 (1 + Rf/Rg) instead of acting as a Schmidt trigger which you intended. The circuit diagram is correct.

Your title is misleading - there is no bistable multi-vibrator in the circuit.

You have constructed the circuit with the +/- inputs (pins 2 and 3) the wrong way round. In this configuration the op-amp acts as a linear amplifier with a gain of 2 (1 + Rf/Rg) instead of acting as a Schmidt trigger which you intended. The circuit diagram is correct.

You have constructed the circuit with the +/- inputs (pins 2 and 3) the wrong way round. In this configuration the op-amp acts as a linear amplifier with a gain of 2 (1 + Rf/Rg) instead of acting as a Schmidt trigger which you intended. The circuit diagram is correct.

Your title is misleading - there is no bistable multi-vibrator in the circuit.

Source Link
Icy
Icy
  • 2.2k
  • 11
  • 16

You have constructed the circuit with the +/- inputs (pins 2 and 3) the wrong way round. In this configuration the op-amp acts as a linear amplifier with a gain of 2 (1 + Rf/Rg) instead of acting as a Schmidt trigger which you intended. The circuit diagram is correct.