Improve the tracking of your VCF by using matched 2N3906 transistor pairs. Read our article on how we match our transistors and for further reading, Ray Wilson's page on the MFOS site is very informative as well a sproviding construction details on how to build your own transistor matching devices.
Whilst the recommendation is to match within +/- 2mV, we aim for better than +/- 1mV by not selecting pairs over +/- 0.7mV.
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