Shuriken
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Posts posted by Shuriken
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No, i haven't build it. I decided against it actually. The two big resistors are basically giving off 12W of heat under full use. Since i am not going to be using 6581 SIDS, i wont need 12 Volts.
So i decided i might as well use a C64-II PSU. I did almost do it though but then the resistor were out of stock at Reichelt.
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I used a 6V transformer for another project, but only a core module was driven by the 5V there. It works very well. I will look into the link after dinner... Anyway, when using the 12V configuration of the transformer, the voltage drop is significant too. Why is that?
I have a multiple voltage configuration transformer. I started out with 6V as well. Worked fine on just the core. But when you start adding components, the voltage drops. My banksticks kept being initialized. I couldn't figure out why. Then i started measuring and they where only getting 3,5V. So i upped the voltage a bit.
The reason the voltage drop is significant when using 12V AC, is probably the thermal protection kicking in. The 7805 has to dispensate all the excess power as heat.
Exactly like this
http://www.avishowtech.com/mbhp/ps/
except the 2200uF is 4700uF and the regulator is a 78S05.
It is made on stripboard but the ground is not on a straight line but a little bit spread out because of the physical size of the big caps plus + and - 12V that are not connected when I try this out. Is there anything I should keep in mind about the grounding except avoid ground loops when doing this? Are the traces of the stripboard big enough to carry the current?
About the +-12V. It is made using the Center Tap Transformer design here http://www.midibox.org/dokuwiki/doku.php?id=bipolar_12v_psu sharing the ground with the 5V part. May that cause the problem in some way?
I would recommend adding two diodes to that design. Like in this drawing. It might not be a bad idea to add a diode to your 5V supply as well.
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Yup Altitude is right, 6V wont cut it. Usually a 9V transformer is used to feed a 7805.
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I don't understand. As your whole case is metal, there shouldn't be any potential difference between back and front. But perhaps the adapter has reverse polarisation and the V+ is connected to the case?
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Hi Shuriken,
As far as I remember I received a 25v version from SmashTv which fit perfectly.
Bye,
Hawkeye
I found that post aswell and it says SmashTV delivered 16 Volt ones, not 25 Volt.
No. Like shoes, parts come in different sizes. You ordered the wrong ones.
You are right ofcourse. But i don't understand why the choice has been made for a niche part. The parts i found at Conrad and Reichelt are all RM 7,5 and have 0,8mm legs.
Edit: Puts foot in mouth :whistle:. It seems Conrad carries a Panasonic one which fits the bill . Part number: 422039 - 89 for anyone that needs it.
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I have my MB6582 almost finished. But still needed to sort out the PSU.
So i wanted to start soldering the components on it, but i ran into a bit of a problem. As suggested by the MB6582 surface partlist i ordered 2200uf 25V caps. Those are 7,5 RM with 1,0mm legs. But to my suprisse the mainboard has a big silkscreen but 5,0 RM 0,8mm position for both the caps.
As the rectified voltage goes way past 18 Volts i don't think its right to put in a 16Volt variant. But still dont understand why a 25V part is suggested as it wont fit the board...
Isn't this a bug or something which needs to be changed?
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Dat zijn er in iedergeval al 2 :D
Die mb6582 van mij heb ik gewoon via een C64C voeding aangesloten. Gaat goed maar weet nog niet wat er gaat gebeuren als het control surface aangesloten is.
Na wat post gelezen te hebben over problemen met C64 voedingen en een horror verhaal van iemand die al zn SIDs kon vervangen, heb ik daar maar niet voor gekozen.
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Ik ben bezig met zowel een MB FM als een MB6582. De MB6582 is in vergevorderd stadium. Ik heb de case en panels ook al. Alle printen zijn gesoldeerd, ik kon het alleen nog niet helemaal vinden met de voeding keuze.
Ik heb zelf uiteindelijk wat ontworpen, maar daar toch maar weer vanaf gestapt. Eens kijken hoe dit gaat werken. Als ik de voeding(gedeelte) klaar heb kan ik gaan testen en in werking stellen.
Qua bezetting word het nog beetje half werk. Op dit moment heb ik 4x 8580 liggen.
Verder nog bezig met 3 filters, NG_AOUT en wat aan experimenteren met CORE32.
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They are using a LM2575-5. I assume you can quite easily make it yourself. I haven't tried one myself.
But switching psu are much more efficient then liniar ones. So if you are not using a MB wich has analog audio, its ok to use a switching psu.
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Cross post deleted (I kept the one in the netherlands-section, doesn't count as a cross-post) and thread moved to a more fitting board.
Ok, but i am not going to answer there in dutch :laugh:
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First of all, please don't cross post. It won't get you any more responses.
I must say i don't have any experience with the midibox router project. However the info you provide is quite minimal.
Have you checked the following page?:
http://www.ucapps.de/howto_debug_midi.html
Also did you check all the boards have the correct voltages?
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Very nice indeed. What type of wood did you use?
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I sure hope these cards actually contain a real opl chipset. By looking at the pcb i am not so sure about it. But since you already bought it, we will know soon enough.
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Thanks, i actually figured it out when i was looking at the schematics for a Roland Juno 60. Roland also used it in their PSU design.
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no connect
we both agree
why measured values on AOUT PCB of R41 is 0,99k ? R33 1,1k ?
I measured the same resistors from Reichelt bag (same colour code) and there are the expected values
As i have two untested AOUT_NG laying here, i am following this with great interest. R41 should be 1.5k and R33 should be 2.2k. So i assume you measured those soldered on the board?
I measured R33 en R41 on one of the boards and got the same values.
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1.) I think only CVOUT is supported. Why would you need CVIN?
2.) Yes you need an AOUT or AOUT_NG module.
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I can't help you with those. I do have another suggestion though. I use these:
It was suggested by someone on the forum. Can't tell you where you can get those in the US though.
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It seems Elektor has an upcoming article with a nice looking digital effects processor. It's based on Spin Semiconductors FV-1 which i have had my eyes on for a while.
What i can make of the small pictures in the magazine, its going to be a mainboard + frontpanel design with 16x2 lcd.
It includes 8 DSP programs. But more programs can be found here. Its all assembler by the looks of it.
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I may be paranoid (ok so I'm actually paranoid..) but in my country birth date is used as information for personal identification. As such it is often used as necessary but not sufficient form of ID when dealing with bureaucracy. I keep mine secret. Identity theft is devastating to those affected by it. Sorry to the OP for bringing the festive mood down, but happy birthday anyway.
I'll go back into hiding now...It's not an required item. So if you don't want people to know...just dont fill in the date. Or just a partial date also works.
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And since we now know your age :sorcerer:
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short notice: Joeribl made a public Reichelt shopping cart for the 2164 module, thank you :) although somehow 4 pieces of an 1 MOhm trimpot slipped into this cart. I removed them from the cart and made a new one, so everything's fine now - just in case people have already used this Reichelt cart to prepare an order, please check you're not ordering these 1MOhm trimpots.
S
Darn, now you spoiled it. I get a percentage on each unit of trimpot sold :devil:
No seriously...no idea how those got in there, so sorry for that :blush:
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I did use something similar to JB Weld to fix the hex nuts (its called Bison Kombi Metaal). I also have a panel with corner holes. So i ordered m3 ones looking like these from ebay:
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That's my scheme. It's without usb connection because i use a usb-midi (2.0) cable avcailable on web for 10€
The pins 12 and 16 are used only for 60xg that have line input, so you don't connect (for that I've done a little aggiuntive board connect to SV5 for supply and to SV4 for Input line)
SV3 is a connector to a potentiometer for volume control
At last increase R8 and R9 at 10K to have minor ampli if you want. (for me it's good like scheme but depends from daughter board, with Roland board was too low volume)
I hope is useful for you, good work
Mike
Does your line-in work as expected?
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Ok,
Thanks
I am already sure for the pinning of the connector but not for the compatibility of the
application with this board.
You have cleared me.
So the creative is the worst of the DBoard :hmm: anyway it is a pity put her in waste
as I own and works well. :thumbsup:
Is there a minimum of schematic for connecting to a core?
I am searching on the forum in this discussion but i found only code file of app.
Effectively it is a MB64 whith midi out connected to midi in of daughter
but if exist a little schematic will be better.
Thanks for any information
best regards
Antix
That's correct. raoulblues only posted some pictures and a firmware file. A schematic...or atleast a brief description of the used MB modules would be appriciated.
MB6582 PSU trouble shooting
in Testing/Troubleshooting
Posted
As nILS said before you need 2V extra for the 7812 todo its work, so 12Vac transformer will do just fine.