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Sujet Clone de 303

  • 75 réponses
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Sujet de la discussion Clone de 303
J'ai trouvé ça :
http://www.ladyada.net/make/x0xb0x/index.html
C'est un DIY clone de 303 bientôt disponible qui va couter 300$ tout compris (même les pieces et la boite!).

Voila.
Afficher le sujet de la discussion
11
Flag
12
Très "M.F.B." dans le look!
Drapeau
13
Pour une "full reproduction", on entend comme même pas mal la différence non ? :??:

http://www.ladyada.net/make/x0xb0x/samples/303acid.wav
http://www.ladyada.net/make/x0xb0x/samples/x0xacid.wav

http://www.ladyada.net/make/x0xb0x/samples.html
14
Vivement qui mettes les doc à dispo comme il l'ecrit tout en bas ...
15
Jme suis inscrit sur la liste d'attente pour cette boiboite. Meme si elle n'a pas le son d'une TB (d'ailleurs rien ne sonne comme une TB), elle s'en rapproche suffisament, et dans un mix avec drums etc... à mon avis ca passera très bien. D'autant plus que 300$ ça semble pas cher.

:bravo:

http://www.myspace.com/acidbreed

16
Exellent ...

Moi je trouve que ça sonne plûtot bien ...
17
Ouaip clair!!!

Aciiiiiiiiiiiiiiiiiiiiiiid!!!

:bravo:

http://www.myspace.com/acidbreed

18
Hello,
Je me suis mis sur la liste d'attente...
Vouis me direz pourquoi ce clone plutot qu'un autre ?
Parce que il est conçu autour des transitors et ampli-ops originaux :aime: !!

Acid Transistor Bass For Ever !!!
19
Original 303 resonance cloning for x0xb0x


The German says:
"the more pronounced resonance of the 303 is due to the high gains on the pnp transistors in the vcf. we couldnt get the exact 'binned' parts so the gains may not be as high as the original. the 2sa733p has a beta (gain) which ranges from 270 to 310 or so whereas the 2sa733ap has a beta from 300 to 350 or something of that nature. (the original used 2sa733ap's whereas we use 2sa733p's) ...so if they check the betas they can place them at the right place. id start with q10 then q9 and if there is one good one left the vco could use one at q8"
also
"the warble in the resonance is due to powerline fluctuations since the synth is run off of an op amp as a power supply. it has troubles at high current draw. also there are tons of low pass filters on the supply that cause droops when large power surges occur. r95 and c28 for example. at any rate, the power supply we built was a bit stiffer than the original. this stiffness can be taken away by increasing the resistance of 100ohm resistor that feeds the opamp. i havent verified this but im pretty sure it would give more warble as the op amp would saturate sooner at higher currents also the bypass cap at that point could be decreased"

So, if you want to get a better 'clone' of the original resonance, use the highest-beta (preferably 300 or higher) transistors in Q10, Q9 and Q8. Then replace R1 in the power supply, on the IO-board, with a larger value, perhaps as large as 200ohms. Note that there are a few different ways to measure 'beta' and your meter may not be the same as another. Therefore, just pick the highest beta (test all of them) and mark those with wite-out or similar. Be sure to read the manual for your multimeter to see if it has transistor beta/hFE/gain testing. The 733 is a PNP with ECB (emitter-collector-base) pinout so put it in the tester properly!
20
Bah voilà, dit comme ça... :clin:

Formateur en techniques sonores ; électronicien ; auteur @ sonelec-musique.com