This CMOS 40106 is a single input inverter with the same Schmitt-trigger action as the TTL 74LS14 but with very good noise immunity of high gain and excellent input/output characteristics to produce a more “squarer” output waveform as shown below. Astable Multivibrators can be made using better CMOS logic technology that operate from a min to max supply such as the Schmitt Inverter. This product was discontinued in 2000 after being bought out by Altium, and is not related to the current software of a similar name. The oscillators may not oscillate if the value of the feedback capacitor is too small. CircuitMaker, from MicroCode Engineering, is an easy-to-use schematic design and simulation tool. This results in a large value capacitor for low frequency operation. Standard TTL logic gates do not work too well as square wave generators due to their average input and output characteristics and distortion of the output waveform and low value of feedback resistor required. This would give a frequency range of between 1Hz to 1MHz high frequencies produce square wave generators distortion. With a resistor value between 100 to 1k and a capacitor value of between 1 to 1000uf. The frequency of oscillation for Square waveform generators is given as in the figure. At high frequency levels the output waveform changes shape from a square shaped waveform to a trapezoidal shaped waveform as the input characteristics of the TTL gate are affected by the rapid charging and discharge. The feedback resistor must also be kept low to below 1k for the circuit to oscillate, around 300 k is good and by varying the value of the capacitor to vary the frequency.
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