After rechecking the parameters for the HCH-1000, I observed that the normal operating frequency range is actually 1kHz - 100kHz, so I reset my desired frequency to 2kHz and recomputed the Ra and Rb values. The resulting adjusted resistances were: 43,000 and 1,100,000 Ohms.
I tested the circuit with these values by simulating it in KTechlab. For the simulation, I created one circuit with a capacitance set to 310pF and a second circuit with a capacitance set to 350pF. The simulation produced outputs with the expected variance.
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| Circuits with different capacitors (310pF on left and 350pF on right) with corresponding waveform outputs. |
KTechlab has good visualization, but I wasn't able to find a good numerical output (I admit I didn't try very hard), so I added a function to my previously posted T555.py script that graphs the calculated frequency.
The next step is to build the prototype and test it.
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