# Multivibrator circuit with solution

Thread Starter

#### Rumination

Joined Mar 25, 2016
74 The figure shows a multivibrator circuit consisting of: an integrator, an Schmitt trigger and a comparator. When the circuit is started up, it delivers a periodic triangular signal OUT_Trekant and a periodic square signal OUT_Firkant.
Operational amplifiers can be considered ideal, with L+ = 10V and L- = -10V. The circuit includes six diodes that can all be considered ideal, with an ON voltage of 0.7V. These diodes together with R3 form a limited circuit, which ensures a well-defined value size of the output voltage Vout_Firkant.

1) Determine the maximum positive and negative output voltage swing of the signal OUT_triangle i.e. Vout_Trekant_pos and Vout_Trekant_neg.

2) Determine the triangle signal switching frequency: f_out_Trekant.

The deadline is tomorrow night.
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The given values:
R1 = 18,6 KΩ.
R2 = 18,2 KΩ.
R3 = 100 Ω.
R4 = 10 KΩ.
C1 = 0,003216 μF.
Ain_comp = 3,37 [V].

Last edited:

#### GopherT

Joined Nov 23, 2012
8,012
*I WILL POST MY SOLUTION IN A BIT* Excellent, use the thread tools button to change the title with "solution posted" when you publish the solution. I look forward to your update.

• Rumination
Thread Starter

#### Rumination

Joined Mar 25, 2016
74
1) Determine the maximum positive and negative output voltage swing of the signal OUT_triangle i.e. Vout_Trekant_pos and Vout_Trekant_neg.

We know that L+ = 10V and L- = -10V. And that

10 V = Vout_Trekant_pos - 0,7
Vout_Trekant_pos = 10 V + 0,7 = 10,7 V.

- 10 V = Vout_Trekant_neg + 0,7
Vout_Trekant_neg = -10 V - 0,7 = -10,7 V.

Or am I completely wrong?

I don't understand question b.

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