Hacked Schmitt trigger oscillator with an expanded Figure 1 circuit that includes R2=RPOT in series with C1

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Other Materials from the Main Document

• Article «Wide-range tunable RC Schmitt trigger oscillator»
• Figure 1. An RC oscillator modeled with QSPICE's built-in behavioral Schmitt trigger, it is a TLC555 (CMOS 555)
• Figure 2. The typical triangle wave input and the square wave output, where the average power dissipation of R1 is around 6 mW
• Figure 3. Schmitt trigger oscillator, this time, with the parameter stepping of R1, the .meas commands for period and frequency measurement, and an auxiliary circuit that triggers AbortSim()
• Figure 4. Frequency versus potentiometer resistance curve in a log plot, interpolated over 100 measurement points
• Figure 5. Hacked Schmitt trigger oscillator with an expanded Figure 1 circuit that includes R2=RPOT in series with C1
• Figure 6. The typical triangle wave input with the output now reaching very high frequencies without excessively loading V(OUT)
• Figure 7. Frequency versus potentiometer resistance curve in a log plot, interpolated over 100 measurement points, showing a flatter curve profile and larger tuning range
• Figure 8. Frequency versus potentiometer resistance curve in a log plot, interpolated over 100 measurement points, showing a flatter curve profile and larger tuning range