Hawkeye
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A viable alternative might be not to use the expensive "center tapped" transformers (which are also quite difficult to obtain), but to use dual-output transformers, i have no big experience in this field, but personally would think, they may be more tolerant to different current draw from the two rails (i´ve just recently built a +15/0/-15v one for a "modular" vcf) From the de.sci.electronics PSU FAQ: o--+ +-----+-|>|-+---+--- + (7805) | | | | | S:S +--(-|>|-+ | S:S | | C1 (C1, C2: 4700uF ergibt 2V Ripple = 'Kondensatorverlust' bei 1A Belastung) S:S | +-|<|-+ | S:| | | | S:+--+----|<|-+---+ S: +-- Masse S:+-----+-|>|-+---+ S:| | | | S:S +--(-|>|-+ | S:S | | C2 S:S | +-|<|-+ | | | | | | o--+ +--+----|<|-+---+--- - (7905) Many greets, Peter
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Hi there and welcome! not a Sammich user myself, but did you check, that all 74* ICs are in the right place (orientation and especially type)? If these are correct, the next question would be regarding your power supply - which type is it and can you measure voltages, when the unit is turned on? As long as there is no "short" between the voltage regulator pins and no PCB traces are scratched, there should be no problem there. Greets, Peter
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Who would not like to play on such a babe synth :) http://youtu.be/R-OcURKPIlY
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Fonda wasn't that old when the original was made. Which shows it wasn't exactly yesterday ;) As long as the remake doesn't include skanks like Snooki I'm all for it.
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+1 on JF not looking bad at all in the classic one. But might be personal preferences :)
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Hehe hawkie, I'm just having a bit fun here :) Of course she aint bad looking, but it's funnier to call her Old Fonda, just as it is more funny in 30 years when I retire to be called badoldbreath instead of technobreath :P
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Great work! Very nice display cover! :frantics:(you don´t have any covers leftover, do you? I really think a lot of people would be interested in them, the quality looks great) Am looking forward to see your new aciiiid MB6582 :) Many greets! Peter -
If you need them quickly, use schaeffer/frontpanel express - great quality and quite easily customizable with the frontpanel designer tool. Many greets, Peter
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Hehe, nice! Thanks for the feedback! These guys should get their tech documentation in order ;-) Bye, Peter
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Stereo Polivoks VCF (nearly complete :)
Hawkeye commented on Hawkeye's gallery image in Members Gallery
Thanks! While this module lacks the unique synthesis qualities of the original Polivoks, much of the sound essence is captured by the raw filter :) Great with SIDs! :) -
Hi Arkay, you can find a complete photo blog of the control surface building process including parts list here: :-D Enjoy! Peter
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Me likey! :) just built a +15v/0/-15v "modular" psu for the VCF with 7815/7915 "center tapped" linear vreg standard approach, which still may be of interest to you, because unless you build a modular monster, the current draw for a few modules is not so high, that using linear regulation would burn excessive heat... But this switcher then is great to efficiently get 5v from one 18VAC transformer coil, without burning so much heat! :) Greets, Peter -
Welcome! Build your own MB-6582! SmashTV sells PCBs and parts and it is a wonderful build experience (prepare to bring some time, though :))! Many greets, Peter
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Hola, using this 6.3mm jack and loving it - the 3.5mm one broke on my MB6582 very early, too :) Bye, Peter
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You´ve definitely already got that famous MBSEQ four-four time C-3 beat going :)
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Strange, indeed! Do you have any other character display to test with? Any 2x20 or even a 2x16 should work to see if it initializes correctly... Only other thing I can say is that the MB6582 uses a 4-bit access mode for the display per default, which caused some problems with my non-lcd not-100% standards compliant display experiments... but... it did never work, it was not "flaky" as in it works one in three times or so... maybe replace the display cable to make 100% sure there is no bad solder joint or broken cable? Bye, Peter
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Stereo Polivoks VCF (nearly complete :)
Hawkeye commented on Hawkeye's gallery image in Members Gallery
Thanks J, i am beginning to understand, why they love this filter in the Shrutis :) -
From the album: Hawkeyes MB stuff
If you are looking for a low-fi audio filter (VCF), look no more... The Polivoks (google bareille polivoks for a free schem) filter is awesome! It screams (with high resonance), it is gritty, it extends the bass (in lowpass mode), and it can be overdriven nicely by applying quite hot input and attenuating the audio signal after the filter. The photo shows a stereo Polivoks build on a veroboard, it was routed by hand, that is why both sides are not visually identical... also due to small differences in the resistors and pots, they sound a very slight bit different, which only adds to the character :-). The external VCF inputs are not wired up yet (empty TL072 slots)... i am also missing a MIDIbox CV, or an AoutNG on the SEQ, which would be fantastic for filter automation.In conjunction with (relatively) low-fi sound sources, in this case, when using it on rather old-school SID patches is great, in stereo it is twice the fun (most analog filterboxes are mono). Hope to demo it soon! The slot is a 1/2 U (height unit) el-cheapo steel rack panel from ebay (ca 3€), drilled with a press drill, attached to a cheap selfbuilt wooden enclosure. Total material cost for the depicted filter was way less than 50€, as no special parts are used... Many, many thanks once again for the tip, J! The polivoks definitely came to stay! :-D Highly recommended rainy-day(s) project for every MIDIboxer! :-) Many greets! Peter -
Hi Ilmenator, I´d guess, the display might be slightly off-standards, and those 4-line displays seem to be more affected than 2-line displays... Me haz experimented with a 4x20 OLED and a 4x20 VFD in the MB-6582, and both needed driver adjustments. Both were advertised as HD4.... (can´t remember the number :-)) compliant, but they were not... In the process of driver hacking (and enjoying PIC assembler, hats off to TK. for writing the whole MBSID V2 platform in that language :-)), I fried the OLED, but managed to get the (expensive) Noritake VFD up and running :-). Why are the 4-lines displays more affected? I remember success reports from 2x20 OLED owners, which worked flawlessly in a MIDIbox without driver adjustment... also, I transplanted a 2x20 OLED into a Waldorf Micro Q (closed source, no driver adjustments possible :-)), which also worked without problems... Edit: as the display initializes sometimes, it still also sounds a bit like a power problem. I once had this nasty 5V undervoltage problem (VFD is very 5V hungry) with the old C64 PSU, where the PICs in the MB6582 slow-booted reproductively... ca 60 seconds from turning on to MB6582-patch display - still faster than my average PC, but... ;-). Can you turn on the MB-6582 and monitor the 5V lane with an oscilloscope in slow-motion (it could be a too small ripple smoothing capacitor in the psu) ? Bye, Peter
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Hi, hab das Problem unter Win 7 x64 auch manchmal... Irgendwie wird manchmal die erste Verbindung abgewürgt... gib doch mal im MIOS Studio in der Eingabezeile ein paar Mal hintereinander "help" ein (produziert Bildschirmausgaben) und probier dann erst den Upload! Ciao, Peter
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Thanks, man! :) The .059 firmware is not yet available as .hex, but you could compile it from an updated subversion checkout - or wait until TK. releases it - reporting successful euclidian pattern generator testing here :) Bye, Peter
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Hey, thanks for the kind comments :clover: Many greets! Peter
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Hola ! Proudly presenting another track to spam the songs&sounds section ;-). This one uses a new patch that tries to focus on the more raw sound abilities of the 8580s, trying to emulate more classic C64 sounds. Also, the euclidian rhythm generator was used to generate the "snare track" - it is a great addon to the SEQ V4, an update to the newest firmware is highly recommended! Thanks for that feature, TK.! :sorcerer: Many greets and thanks for watching and listening ;-) Peter
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Tim, thanks again for your great job! And very good idea on dividing the workload - the guys who can´t wait for the SEQ can buy the CS PCB in the shop right now and source the parts themselves, the others wait for a perfect kit :) Me feels very tempted to buy a CS board for a second portable full-blown SEQ, but will wait a bit, because I guess that demand is very high from people that do not have a SEQ right now. Have a great weekend! Bye, Peter
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Normale Trafos für lineare Netzteile kriegst Du überall, z.B.: http://www.reichelt.de/Flachtrafos/UI-39-17-212/3//index.html?ACTION=3&GROUPID=3319&ARTICLE=27578&SHOW=1&START=0&OFFSET=500& Güte kann man nur durch genaues Studieren des Datenblattes (vor allem Schaltfrequenz) erahnen, besser sind aber A-B Tests mit linearen Äquivalenten oder Erfahrungsberichte von anderen Benutzern (die das Ding ebenso für den Audiobereich einsetzen und gute Ohren haben :-)). Ciao, Peter
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Stimme orange 100% zu, habe für die MB6582 den "heisseren Bruder" im gleichen Gehäuse in Linearversion aufgebaut - man kann es gut als Fusswärmer an kalten Winterabenden verwenden :) Wenn ein Switcher wirklich störungsfrei im Audiobereich ist (das sind jedoch die wenigsten "Wall-Wart" PSUs), dann ist es die effizientere, kleinere, leichtere und häufig auch billigere Lösung. Herausfinden kann man es aber nur mit einem A-B Test, einem Oszi, oder eben Erfahrungsberichten... Ciao, Peter
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Hi there, you could simply switch the MIDI OUT channel on the keyboard and setup a route for every inbound channel to the respective outbound synth chain: FROM IN1, CHN1 TO IIC1, CHN1 FROM IN1, CHN2 TO IIC2, CHN1 ... you have 16 router nodes at your disposal, of course you could also route USB MIDI IN in a similar way... Enjoy the SEQ - it is awesome, the MIDI router functionality alone seriously rocks :) Bye, Peter
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Dear Electro, my recommendation on what to do: stop aggression (quote: "nobody knows you are on the last mile") towards our beloved primary parts dealer, finish your design and production process, then present it to the public - it happens quite often, that new projects are boldly announced, but words are all that come out of it. My right small toe also tells me, that the MIDIbox shop haz lots of SEQ V4 parts + PCBs inbound, for all people, that are not willing to wait that long. Peter
