Скачать или смотреть Breadboarding and Debugging the Triangle Core - Exploring Analog Audio Synthesis ep9

Triangle Wave VCO Core
Part 2: Breadboarding and Troubleshooting
Exploring Analog Audio Synthesis, episode 9

Part 1 presented a design ov a triangle-wave core for a voltage-controlled oscillator. In part 2, we build it up on a breadboard, fixing at least half a dozen bugs as we go.

This pair of episodes brings together many threads that we've followed in the last couple of months. Our oscillator uses a current source, regulated by a bandgap voltage reference. It uses an SPDT version of a saturated BJT switch. It incorporates a current mirror and an op-amp integrator. And our component selection runs through a bunch of the calculations from our earlier episodes.

Schematics, Python script that computed component values, and CircuitJS model are all on the project GitHub: https://github.com/kennykb/kevins-cav...


TIMELINE

00:00 Intro
00:40 TL431-regulated current source
02:00 SPDT switch from two BJT's
04:19 Current mirror
06:11 Integrator
07:19 Comparator
09:48 Initial tests
11:42 Rescaling comparator output
13:41 Retesting with comparator change
14:49 Next steps
16:37 Outro


CREDITS

Images:

"Cain by Henri Vidal, Tuileries Garden, Paris, 1896"
https://www.flickr.com/photos/proimos...,
© 2009, Alex E. Proimos
Licensed under Creative Commons: By Attribution 2.0 License
https://creativecommons.org/licenses/...

"Dunce"
https://flickr.com/photos/scjn/345091...
© 2009, Flickr user '~Pawsitive~Candie_N'
Licensed under Creative Commons: By Attribution 2.0 License
https://creativecommons.org/licenses/...

Music:

“Light Sting” Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/b...

“Apero Hour” Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/b...