rmouneyres

ca y est c'est terminé, et ca fonctionne du feu de dieu ! J'ai plus qu'a mettre à jour l'article en question sur le wiki...il va falloir du courage

Hello, I've almost finished a guitar fx looper (which would need a major wiki update...), and i'm wondering if i could add a tuner to this box. As i'm not using any AIN, i have all the analog pins free to use. I think that the 10bits conversion is enough to have the guitar signal. I've found this in the forum but this is standalone project : The code for the fx switcher is pretty small, and written in C. So i guess there is room for the tuner code. Is there any code block known that i could use ? thanks

Bonjour, cette pédale ne contient pas de circuit analogique. C'est simplement un looper pour pédales externes. J'utilise un chip ULN2803 commandé par un DOUT. Si tu cherches des circuits delay, il y a quelques semaine, ce francais sur ebay : http://stores.ebay.fr/BILTOC-ELECTRONICS?_trksid=p4340.l2563 il avait des circuits avec un bon prix, mais plus maintenant... à surveiller

Bonjour à tous, je sors de ma caverne pour refaire un tour dans le monde midibox. Objectif : créer un pedalboard analogique pour le bassiste de mon groupe, mais commandable en midi car notre set et tout automatisé (mais on joue quand même je vous rassure). J'ai bien bien avancé à ce jour, il me manque la PCB de la carte relais qui arrivera après noël. Donc ce post me permet de partager mon enthousiasme, de vous présenter mon projet avant de le finaliser, et surement de devoir mettre à jour le wiki qui contient déjà des bases dont je me suis inspiré. J'ai aussi tiré des infos du super site techniguitare qui propose un looper de très bonne facture, mais auquel il manquait deux trois petites choses pour que ca me convienne vraiment. Et ayant des boards midibox en stock je gagnais du temps. Celà a également été l'occasion pour moi de me replonger dans le codage en C avec MIOS, un vrai régal pour les fainéants comme moi :afro: Une fois que j'aurai validé la bête je pourrai soumettre mon travail aux critiques ;) Trèves de plaisanteries, voici quelques photos : N'hésitez pas à poser des questions, A bientôt Raphaël

mince je crois que j'ai raté le train, ca avait l'air bien cette affaire !

yes it is working fine with outputs 2 to 5 :) Then for output 1 them problem is still here, even with grounding the case of the GM5. Now maybe I can ground the case of the computer itself. But this will be ground, not earth. BEcause as it is a 1U rack case powered with an external PSU. I only have 12V coming in the computer... But this doens't explain why outputs 2 to 5 are working... I have another alternative : connecting output 1 on my veroboard like the other outputs, but i need to add more circuits on a full veroboard.... probably ugly job... i'm not enthusiast :hmm: As i'm not on a hurry about this, i'll do more experiment, and let you know when i have more news, hopefully solved. All those EMI discussion never go too far from what i've read, just trying other cables (what i've done already), ferrites, changing ports.... may you find something usefull, let me know

ok thank you guys for answering, so here we are : The problem occurs with any software i'm using (SEQ or puredata mainly) with alsamidi or jack. And it only happends when the ports is in use (midi data flowing out). The dmesg was a great thing to check, thanks pilo : usb 4-0:1.0: port 1 disabled by hub (EMI ?), re-enabling... usb 4-1: usb disconnect address 13 usb 4-1: new full speed USB device using uhci_hcd and address 14 usb 4-1: configuration #1 chosen from 1 choice So after looking for some help on the net, it looks like this is very related to EMI grounding problems. I have to admit I haven't done any grounding to the chassis in my build. The case is all aluminium, should I connect the chassis to the USB ground ? (The macbook laptop would not suffer from these grounding problems...) EDIT :: The problem occurs only when connecting midi out 1 on the GM5 board (the small midibox one) when i use the midi outs 2 to 5 from the expansion board (on a veroboard), it is working ok ! I could have a bad soldering on the midi out connector of the GM5 board. I'm taking a look at that now. >> result = not better here i'm looking forward to your advices

hey, after replacing the capacitors with more adequate ones, the problem is still here. Somewhat different because it is now stable for about 1 minute, then it dissapears/reappers every 5 seconds or so...missing so notes when there is the gap. Under osx, the box has been proved stable for one day long in live situation, so i'm now confident that the board is ok. I'm going to test with another linux distro (now it is tangostudio), maybe there is something wrong on the usb driver side, or maybe the powering (as i'm using an mini itx board with a picopsu...rated at minimal power requirements)