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NorthernLightX

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Posts posted by NorthernLightX

  1. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    No I bought 2 because of the exorbitant shipping and handling costs (the unit costs €22 on the website, the S&H is €25 :mad: ). So now it's about €33,50 per unit instead of €47 for one. The FM doesn't need that much power anyway so I can build a linear supply for it with parts I already have in stock.

    Plus the order hasn't yet been confirmed so I could also just buy 3 now :)

  3. MIDIbox SEQ Aluminium Desktop Case

    in Bulk Orders

    Posted

    Nah, not in the mood for cuting up things just yet. Might bug them about a case with dimensions that would harbour the baseboard in the future, 'cause those cases look sweet. First things first though; finish 6582 vanilla -> finish other projects -> rip up 6582 and stuff in bigger case with custom frontpanel. Maybe. Ever. :shifty:

  5. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    The problem is most components recommended are SMD. I looked for through hole stuff at reichelt....and still ended up with smd. For the caps you need low esr parts which are a bit more expensive.

    Low ESR is no issue, I ordered loads of those a few days ago for some other projects that are scheduled for imminent completion :angel:

    I consider myself adequate enough as far as soldering wires and through-hole are concerned, SMD however is a big nono for me, I'm not going down that path. ordering it is then, I hope they get back to me soon.

  6. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    Any guess on the cost and complexity of that homebrew switching PSU? I like the DIY idea, but I need to have some success this time... everytime I run into major difficulties with the DIY projects I shelf the whole shizz and pickup one of my other hobbies... Maybe better for me to just order one of those 20€ (plus €25 S&H) babies and get going while I'm on this roll... Just thinking out loud :ermm:

  8. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    RPT-60 looks like a winner, though it's about the same price on Mouser as the LPT42 I found.

    I believe both of them are equally suitable. The Mean Well is a little bit smaller but that's only an issue if you're tight on space. If they're no different price-wise just buy the one that's in stock :wink:

    I've mailed the Dutch distributor asking about the stock of the RPT-60. If it's in stock I'll buy at least one for my 6582, and I'm considering buying one for my FM too.

    BTW don't forget to buy the matching Molex connector for the primary and secondary side of the PSU.

  9. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    Hmmmm, that TP-75 is not the holy grail after all I guess; this is what the datasheet says:"Fixed switching frequency at PFC:67KHz PWM:134KHz". I have no clue what that means exactly, but 67KHz does not look pretty for that price (€ 43,90) and it's quite over dimensioned even for a very full SID box.

    That LPT42 @ Mouser is also a bit on the expensive side, €36 for an open frame unit.

    I found this: http://www.meanwell.nl/products/Meanwell-RPT-60B---PSU-pcb-medical--plus-5V-44A---plus-12V-22A---12V-055A__RPT-60B.aspx

    Features:

    Open frame - oh well, we're DIY, so we'll fix something won't we?

    Delivers +5v/+12v/-12v - check

    Switching freq @ 100KHz - yay!

    Tiny(!) - only measures 4"*2" (rougly 10cm*5cm)

    Affordable - a little over €20 ex VAT

  10. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted · Edited by NorthernLightX

    Heads up, not all of the Mean-Well switching supplies switch at 132kHz.

    Good tip. Lesson: assumption is the mother of all f***ups. I'm very glad until now I only inquired about prices because I was planning to order this morning; great timing dude! :thumbsup:

    I'll go ahead and dig into some datasheets then, basically anything switching above 50KHz (I know human ears often dont go beyond 22KHz but let's assume Philips knew what they were doing when deciding that 44.1KHz was the right bandwitdh to use when they developped the CD) is out of the audible spectrum, above 94KHz is out of the recording spectrum as well and thus (theoretically) better. Aside from the guys who record at 192KHz but I don't believe any switcher is that fast. Besides, if it really adds something to your recording to go to 192KHz/32bit instead of 94KHz/32bit is a whole different discussion.

    /EDIT

    I found some datasheets of Mean Well supplies that deliver the required voltages:

    http://www.meanwell.nl/Images/pdf/datasheets/T-40-spec.pdf

    http://www.meanwell.nl/Images/pdf/datasheets/RQ-50-spec.pdf

    http://www.meanwell.nl/Images/pdf/datasheets/TP-75-spec.pdf

    Nowhere can I find the switching frequency. Is it hidden somewhere within another parameter?

    /EDIT2

    Damn I need glasses, it's at the top of each document. :whistle:

  11. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted · Edited by NorthernLightX

    So, the Meanwell appears to be a good solution.

    Some success has been reported. Still, try at your own risk :rolleyes:

    One more thing: should I get the T30 or T40?

    Depends on what you're going to power with it. T30 looks good enough for a 6582 with added filters and more fun, but as it is not available from the Dutch distributor (and I can't find it on meanwell.com either - discontinued maybe?) I'll go with the T40. Whichever you choose, you need the 'B' model for +5/+12/-12.

  14. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    OK, Mean Well distributor in NL just got back to me about prices. Up to 19 units will be €18,20 per piece, when ordering more than 20 units price per piece will drop to €16,30. For standard shipping & handling they charge €25 per order.

    So for example if there would be 5 midiboxers who want one, price per piece would be €18,20 + €5,00 + shipping to your home address (or come pick it up for free & a coffee).

    So, is anybody interested in a bulk-order of these babies? Just shout here or PM (or mail) me, if there are a few guys interested I'll also advertise in the bulk-order section. I'm not planning on organizing a huge order though, so don't wait too long to respond but also don't jump on if you don't have the ca$h (and keep in mind that shipping in NL can be quite expensive; €7 for domestic parcels, international costs more).

    Cheers, Alex.

  15. [WTB] 2x15V 20VA Toroid Trafo (preferrably in NL)

    in Fleamarket

    Posted

    Hi All,

    for an audio project (unrelated to Midibox btw) I need a 2x15V (or 1x30V with center tap) Toroidal power transformer rated 20VA (but higher is not a problem). The thickness of the unit should not exceed 30mm, it needs to go into a 1U case. I could use a total of 3 of those units.

    Reichelt sells them @ €15,75 new and shipping is not an issue since I need some stuff from there anyway, but it'd be nice if someone has them lying around and doesn't need them anymore. Preferrably in NL so shipping costs can be kept low. I also have a few things to trade if that's more fun, just drop me an email or a PM and we'll sort things out.

    Cheers, Alex.

  16. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    The 45-15 one is a bad idea. According to the datasheet it needs active cooling. Looking at the datasheet it does looks like a dated design. Estimated Efficiency at full load is min 65%. Which isn't very high. Could very well be that the switching frequency is quite low. But can't find what it is.

    At the distributor you pay only 18.75 euro for the t-40 meanwell. Downside is they only sell to companies.

    I'll scrap the 45-15 then, and go for the Mean Well. Has better looks anyways.

    Do you have an URL or something for the distributor's details? I'm a freelancer so I have everything needed to buy stuff directly from them, as long as I don't need to buy 10 at once anyway (in which case I might organize a bulk order :))

  17. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    Display sells the t40 one for something like 34 euro. Couldn't find a local supplier for the t30.

    Me likes! I didn't search very hard yet but found these 2: http://www.dil.nl/PartDetails.aspx?ProductID=ZPS30 and http://www.dil.nl/PartDetails.aspx?ProductID=ZPS4515. Have no idea about their switching freqency but one of these has been successfully used as a replacement PSU in a vintage amplifier I was told. But since those are EOL I might just go for the T40, seems to be perfectly right for what I want with it.

  18. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    Why not use 2 wall warts of appropriate voltages (9VAC and 5VDC) and just wire them up?

    Because

    a. I need +5, +9, +12 and -12 volt rails so I would need 4 wallwarts with your solution.

    b. Wallwarts are uncool, more than 1 wallwart is seriously uncool (IMHO). 4 wallwarts is not only insanely uncool, but also extremely impractical.

    c. What's the fun in using wallwarts? I like it better if something is custom and/or expirimental. Besides, if it turns out switching PSUs aren't evil anymore per sé, lots more Midiboxers could benefit from that info, so I plan on ordering one in the very near future. Might even finish my 6582 project that way.

    I personally don't trust the old C64 supplies. The SID chips are worth more than the risk of burning them up when the supply fails.

    And you're exactly right to do so. (IMHO again)

    Cheers, Alex.

  19. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted · Edited by NorthernLightX

    I have been talking to someone with experience on using switching PSUs in audio applications. He suggested putting coils in the path for filtering, if the HF noise would be within the audible spectrum. I have no idea if and how that would help, maybe someone who is into this matter could explain further?

  23. Custom Power Supply for mb6582

    in MIDIbox SID

    Posted

    You guys still messin' with my PSU desing huh? :)

    Sad to say I never got it working and all MB stuff has been in the closet for several years. Would love to finish that stuff one day, but I don't have them skillz to finally make a usable PSU. Anybody in the Amsterdam / Haarlem area willing to help? (read: I'll provide coffee/beer and/or entertainment while you do the hard work, and I will offer spare parts/ICs/other cool stuff as compensation for your time).

    Cheers, NLX

  24. [TRANCE] 3 tracks

    in Songs & Sounds

    Posted

    WTF Alex are you finally making some music after all these years ;)

    I see i gotta catch up with you :P

    Will listen to your tracks this weekend.

    Hi Jeff, no I was making music fairly often, just never finishing anything :D

    Please do check the songs, I really want to know what everybody thinks. Have sent them to a dozen trance labels last week, hope I get a positive reaction.

    Pffffff....I'm recovering from Mysteryland, that was quite a hefty party....

  25. [TRANCE] 3 tracks

    in Songs & Sounds

    Posted

    LOL, you might be amazed how much irregularities and exceptions to rules there are in Dutch, it's said to be amongst the more difficult languages to master. But do try, at least German is one of the closest relatives.

    But back on topic please ;)

    I have had some not so hot comments on the synthforum.nl (not bad but just not so hot), any comment is very welcome. I need to improve, so spill the guts!

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