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* The 7k5 resistor in the DAC circuit can be replaced with a common 6k8 if need be. As I had no 7k5 resistors to hand, I tested a dozen 6k8 5% resistors, and selected one that read as 7k3.
* Do not upgrade the 741 to a better device. It's poor [[slew rate]] acts as a filter, smoothing off the waveforms.
== CC-BY-NC ==
Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work.
== See also ==
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