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Portable Low Frequency square wave generator circuit - Solved - page 3
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Simon:
Well you coul easily use an opamp and 2 9V batteries. You build a classic relaxation oscilator and if neccessary beef up it's output with the totem pole transistors. You can put a resistor in series with the output. You will need a rail to rail opamp as the ouput needs to be such or if you use the totem pole the output will be the input less 0.7V
Laszlo:

--- Quote from: Simon on May 29, 2019, 05:42:34 pm ---Well you coul easily use an opamp and 2 9V batteries. You build a classic relaxation oscilator and if neccessary beef up it's output with the totem pole transistors. You can put a resistor in series with the output. You will need a rail to rail opamp as the ouput needs to be such or if you use the totem pole the output will be the input less 0.7V

--- End quote ---

Like a Schmitt-trigger?
Simon:
https://www.electronics-tutorials.ws/opamp/op-amp-multivibrator.html
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