rbv2

hi all, build my sammichSID 3 years ago with no problems. now i got it back from a friend and the backlight of the display was not working anymore. i tried to find out whats wrong and found the display backlight is working when powered from a battery. during testing with an led on pins B-/B+ i somehow shorted the little sammichSID. when i turn on the unit all i can see now is the row of black boxes on the screen like without firmware. it is still doing the start sound and the flashing led sequence in the beginning. I tried to re-upload the firmware but nothing changed. what else can i try? please help. thanks

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hmm, interesting.. any ideas what else i can do? thanks

hi, this is the noise i get from the output, the clicks and pops occur by using the encoder! the psu is the voltcraft named by param1. http://kiwi6.com/file/vy7o58mbv8 thanks wilba! i`ll give it a try and order one of these! hope to find a shop in germany.

hmmmm.. im not shure, i'll do a recording of it this week and upload it! also i have to check which kind of sids iam using.. maybe im to picky and its in the normal range. :ahappy: thanks

thanks guys! hey param1, that voltcraft psu is also part of my collection. are you happy with it? for me its still to much noise.. or lets say more than the normal noise you get from other synths! rbv2

hi all, can anybody give me a link where to order the perfect psu for my little sammichSID please? its not that i'm to lazy to search myself but it seems that i'm not able to find one that doesnt produce noise or hum. in the meantime i bought 4 different psu and none of them works adequate.. thanks rbv2

thank you all! maybe resoldering was not without success! bevor i did that i got hum/flickering even with brightness pot set to minimum. i still get a little flickering sometimes (caused by the psu) but the backlight is not totally off anymore! also the reboot seems to be gone! :) will get me an new psu after vacation!

i removed one sid, now i get no sound from the audio out.. i can set the brightness pot whereever i want, no hum no flickering! (flickering is very rare at at all) with both sids installed i get hum when the brightness pot is shortly bevor maximun. but i cant reproduce the reboot by setting the brightness to maximum anymore.. i also have noticed a crackle noise when switching the presets without playing any sound. (with all sids installed) just to let you know: tomorrow im on vacation for one week so i have no chance to answer! thanks for your help so far!! i come back to you!

thanks! ok. i soldered the trimpots and jbl header again, without success.. inserted two shunts into jbp .. the voltage on points labelled 12v are not exactly 12v! 11.40v instead. ( when i check the voltage of the psu directly on the plug its 11.50v) when adjusting the brightness pot the hum still is getting louder! the backlight is mostly on for now but flickering still appears sometimes. :sad:

the backlight is working at the moment.. no flickering! when i remove the shunt in jbl the hum is gone.. when insert the shunt to 5v also no hum. alsways the display is not working there also is no hum.. just a silent crackle.. thanks rbv2

thank you.. just to be on the safe side :) here are the specs of the psu in detail: Type Linear Type regulated 1.5 - 12 V/DC input voltage 230 VAC +- 10% (B x H x T) 61 x 95 x 92 mm Typ PA-500S LED weight 370 g (its near the same wheigt as the first psu in the link wilba posted (without connectors and packing) when i pick it up it feel like a handy brick :) and its double the price then the recommended psu's. so what do you think? ps: mainly the backlight is off .. no flickering anymore.. the rest of the box is working without any problems. the reboot only occurs when the backlight is on and i turn up the brightness pot. i also can hear a hum at the audio out which becomes louder when i turn up the backlight pot.. thanks rbv2

are you shure with that? to me it looks exactly like one of these psu recommended by wilba ?

hey, thank you for the numerous replies! i bought the following psu from conrad electronics http://www.conrad.de/ce/de/product/518313/ 500 mA 12 V/DC regulated (cant read anything about switchmode or schaltnetztei in the manual so i would say its no switchmode psu) i connected it but the display still behaves the same way.. the flickering is totally random.. now mostly off :( is there anything else i can check? thanks rbv2

hi all, finished my sammichSID some hours ago and it was more easy than expected.. thanks wilba! but i have a problem with my backlight lcd. during upload of the hex file the lcd started flickering with each line of the code.(like the the code is triggering the backlight) upload was succesfull anyways. after uploading the display is flickering randomly.. when i turn up the backlight pot. the sammichSID even reboot sometimes. the measurementns where correct! the psu is 12v dc 600ma http://www.reichelt.de/?ACTION=3;ARTICLE=87338;PROVID=2402 is this caused by a bad soldering? please help me! thanks in advance rbv2

that would be perfect! thanks rbv2

hey thank you for the reply. i figured it out by changin the pins while mios was runnig.. ::) cant wait to get my frontpanel.. thanks rbv2

hi all i also received a bankstick PCB from Mike. and of course i have a question. my banksticks are all soldered in like shown here: (with sockets ;) ) http://www.midibox.org/forum/index.php?action=dlattach;topic=9981.0;attach=1636 my question is regarding the pins: is the position of the pins the same like here?: http://www.ucapps.de/mbhp_bankstick.html and is it still necessary to add the jumper-wire. i watched the copper traces for about a hour to find out about the pinning but ??? is it possible to find out the pinning by using a multimeter? thank you all btw. i also received my displays last week...switched on...aaaand its alive and says hello (READY) ;D feels good

hey thank you! i'm always interested in some extra-knowledge :D regards rbv2

hey :o thank you for the superfast reply. happy rbv2

hi all i have a short question. is it ok to use a 9v600ma psu instead of 9v500ma with seqv3..i'm a little scared of damaging something. thank you rbv2

hi all count me in too.. for 1xpcb + case + frontpanel thank you

danke für die erklärung!! das mit der kabelei versteh ich sehr gut (auch hier hat sich einiges an hw angesammelt..und es will nicht aufhören :) dachte anfänglich das die id etwas damit zu tun hat ob ich 2 midi ins nutzen will.. einen 2ten sequencer zu bauen...hab ich auch schon dran gedacht..der muss dann super-kompakt sein zum rumschleppen.. warum nicht gleich drei (aahh grössenwahn ;D ) einen im studio, einen bei der freundin, und einen für live (wenn ich mal gross bin) DANKE!!

hey dj3nk also ist es ok wenn ich die id auf 0000 0000 0000 0000 lasse und die IIC midi module per jumper adressiere? mein pic war schon mit mios programmiert deshalb konnte ich lange auf den reply warten (kommt ja dann nur einmal ;) ) die displays sind auf dem weg zu mir...leider noch nicht da.. danke und grüsse rbv2

IIC Midi Module natürlich... 8)