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I built a square wave generator using an astable multivibrator circuit. With

  • RB1 = RB2 = 100 kΩ
  • C1 = C2 = 1 μ
  • F my frequency is approximately 7.14 Hz.

Is there any possibility to improve my circuit by just using passive and active components or changing the values of the existing components to obtain a frequency band between 26 kHz and 52 kHz for a load resistance of 13 kΩ?

enter image description here

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    \$\begingroup\$ There is a possibility, yes. Maybe you should ask for solutions how to do it? \$\endgroup\$
    – Justme
    Commented Oct 30, 2022 at 9:03
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    \$\begingroup\$ Are you searching "how" to make a VCO? \$\endgroup\$
    – Antonio51
    Commented Oct 30, 2022 at 9:42
  • \$\begingroup\$ Im trying to make a square signal generator using just discrete components, with adjustable peak to peak oscillation voltage, adjustable frequency \$\endgroup\$
    – Stefan Daniel
    Commented Oct 30, 2022 at 9:53
  • \$\begingroup\$ VCO is "voltage controlled oscillator". \$\endgroup\$
    – Antonio51
    Commented Oct 30, 2022 at 9:55
  • \$\begingroup\$ Adjustable peak to peak voltage can be done with a potentiometer and a "voltage" follower made with another BJT. \$\endgroup\$
    – Antonio51
    Commented Oct 30, 2022 at 10:00

1 Answer 1

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You can change the frequency of oscillation by changing the capacitor value. This LTSPICE simulation results in a frequency in the range of 32kHz.

enter image description here

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  • \$\begingroup\$ For [x_val, y_val] Khz frequency, is it possible to set the value of frequency by using a potentiometer for variable resistance of R2, R3 ? \$\endgroup\$
    – Stefan Daniel
    Commented Oct 30, 2022 at 9:47
  • \$\begingroup\$ I dont see why no. \$\endgroup\$
    – Miss Mulan
    Commented Oct 30, 2022 at 14:02

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