Update README.md with some references

README.md

@@ -1,4 +1,43 @@
 
+## Proyectos
+
+### Atari Punk Console
+
+- [Un modelo simple](https://samvssound.com/projects/synthesizers/atari-punk-console/)
+- [El mismo modelo con LFO](https://samvssound.com/tag/stepped-tone-generator/)
+- https://sdiy.info/wiki/Atari_Punk_Console
+
+### Altavoz
+
+- https://samvssound.com/projects/amplifiers/lm386-power-amplifier/
+
+### Velleman voice changer
+
+- https://diyaudiocircuits.com/velleman-mk171-voice-changer-circuit/
+
+## Referencias
+
+- [Synth DIY Wiki](https://sdiy.info/wiki/Main_Page)
+- [Music From Outer Space](http://musicfromouterspace.com/) Probablemente una de las más conocidas, es la página del autor del libro _Make: Analog Synthesizers_
+- [MFOS: Weird Sound Generator](http://musicfromouterspace.com/index.php?CATPARTNO=WSG001&PROJARG=WSG2010%2Fwsg_page1.html&MAINTAB=SYNTHDIY&SONGID=NONE&VPW=1910&VPH=807) El proyecto que recomiendan en MFOS para empezar.
+- [Especificaciones Eurorack](https://sdiy.info/wiki/Eurorack) (Esta wiki parece abandonada)
+- [Eurorack](https://intellijel.com/support/eurorack-101/) Bastante bien explicado
+
+
+### Para revisar
+
+- <https://hackaday.com/2015/02/04/logic-noise-sweet-sweet-oscillator-sounds/>
+- <https://www.schmitzbits.de/>
+- <https://www.soundtronics.co.uk/mfos-sound-lab-mini-synth-mkii-diy-electronics-parts-kit.html>
+- <https://blog.thea.codes/the-design-of-the-juno-dco/>
+- <https://synthityourself.com/>
+- <https://www.thegeekpub.com/272691/building-a-breadboard-synthesizer-with-a-raspberry-pi-and-an-arduino-uno/>
+- <https://northcoastsynthesis.com/synth-diy-projects/>
+- <https://northcoastsynthesis.com/synth-diy-projects/>
+- <https://www.hongkiat.com/blog/open-source-hardware-synths/>
+- <https://diyaudiocircuits.com/velleman-mk171-voice-changer-circuit/>
+
+
 
 ### References
 
@@ -7,4 +46,3 @@
 - [Atari Punk Console Improved](https://samvssound.com/tag/stepped-tone-generator/)
 - [Music from Outer Space](http://musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=YOURANALOGSYNTH/page2.php&VPW=1354&VPH=556)
 - [Music From Outer Space: Projects](http://musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=ALIENSCREAMER%2FALIENSCREAMER.php&CATPARTNO=ALIENSCREAMERPCB)
-