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2020/11/08 05:18
MB-6582 Base PCB Construction Guide
Please read the entire construction guide before buying parts or starting to solder
anything.
Note that Base PCB revision 1 (the red ones bought directly from me) has a few missing
tracks. See the bottom of this page.
I have tried very hard to document and explain the process that I followed while constructing my
original MB-6582 and how I suggest people construct their MB-6582. I assume people constructing an
MB-6582 base PCB have a basic level of electronics knowledge and some basic soldering skills. You do
not need to know exactly how each and every part works, but you must know the very basics of
electronics, that electrical current flows along the tracks on the PCB, that all points along that track
should measure the same voltage, etc.
So some parts of this guide are specifically to help the newbie that might have done a few simple
electronics kits, but might not have soldered these kinds of components before, or know exactly what
type of component to buy. So I'll tell you where you could go wrong, and how not to go wrong. I'll tell
you the best order to solder things together and how to test things along the way. If you want more
information about how it works, you can refer to the MIDIbox module documentation (i.e. the Core,
DIN, DOUT and SID modules).
If at any time you do not understand what to do, or the instructions are confusing, post your questions
on the MIDIbox forum and I or someone else will help.
PSU Options
There are three different ways of supplying power to the base PCB:
PSU Option A: C64 power supply, generating only 9v supply (no 12v) ... exactly like the
prototype, it converts the 9v AC coming from the C64 power supply. This option only allows use
of SIDs that need 9v (8580 or 6582), the 6581 needs 12v. One 9v voltage regulator is used to
supply 9v to all the SIDs.
PSU Option B: C64 power supply, generating 9v and 12v supply ... almost exactly like the
"C64 PSU Optimized"
get the 12v required for 6581 SIDs. Instead of a voltage regulator on each SID module, there
are just two (one 9v and one 12v).
PSU Option C: Uses 5v regulation circuit to provide option A or B when not using C64 PSU
(which has its own 5V regulation). I have added this option at the last minute to the PCB as a
potential workaround for people unable to get a C64 PSU. People could generate 5v from a
single unregulated 9v AC supply (9v AC adapter) or supply separate unregulated 9v AC and
unregulated 5v DC supplies (9v and 5v AC adapters), using the same power socket and switch.
Please do not assume this idea will work well, it might introduce noise, hum and heat!
PSU Option D: External regulated power supply circuit, supplying +12v,+9v,+5v and ground
... for those people wanting to use their own power supply, because they don't want to use the
C64 PSU.
MIDIbox - http://www.midibox.org/dokuwiki/
1/13
circuit, which adds the 9v DC to the 5v DC to create 14v DC, enough to
MB-6582 Base PCB Construction Guide
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Summary of Contents for MIDIbox MB-6582
- Page 1 MB-6582 and how I suggest people construct their MB-6582. I assume people constructing an MB-6582 base PCB have a basic level of electronics knowledge and some basic soldering skills. You do not need to know exactly how each and every part works, but you must know the very basics of electronics, that electrical current flows along the tracks on the PCB, that all points along that track...
- Page 2 PCB. If you wish to use the PacTec PT-10 case (like the original MB-6582), then you should use a Commodore 64 power supply (i.e. the thing which plugs into a Commodore 64), and you can choose between option A or B.
- Page 3 Socket/Switch Options If you are constructing a base PCB to go with the PacTec PT-10 case like the original MB-6582 (or want to use the PCB mounted sockets and switch with a different case), then you will need to solder the PCB mounted sockets and switch at the top of the PCB.
- Page 4 Last update: wilba_mb_6582_base_pcb_construction_guide http://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582_base_pcb_construction_guide 2012/05/04 00:38 If you are choosing not to use the PCB mounted sockets and switch on the base PCB (e.g. panel mounted or separate PCB mounted) then you will need to connect those components to the base PCB with wires.
- Page 5 2020/11/08 05:18 5/13 MB-6582 Base PCB Construction Guide Tacking Tacking is what I call temporarily attaching the component to the PCB so you can then use two hands to solder the other joints while the component is in place. The process is as follows: Put the component in the PCB and hold it in place with one finger.
- Page 6 Last update: wilba_mb_6582_base_pcb_construction_guide http://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582_base_pcb_construction_guide 2012/05/04 00:38 Desoldering Avoid at all costs the need to desolder a component. If you must desolder a part, it is probably safest to cut it off on the top side, leaving enough to pull the lead out from the top side while the iron is on the joint on the bottom side.
- Page 7 J15_CORE1 (for master Core’s LCD) J3_SIDx, J23_SIDx (for connecting feedback pots, or at least grounding the SID audio inputs) Then the list of useful headers for a “default” MB-6582 setup (no expansion port usage): J70 (for passive mixed output, to connect to headphone jack)
- Page 8 Last update: wilba_mb_6582_base_pcb_construction_guide http://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582_base_pcb_construction_guide 2012/05/04 00:38 are. I've only identified which headers are optional for completeness of documentation. Just put them all in, except ones ending in A or B (these are alternatives to a socket) Advice About Specific Components Please pay close attention to this advice.
- Page 9 2020/11/08 05:18 9/13 MB-6582 Base PCB Construction Guide Resistors R40 to R55 (resistors between DOUT and control surface LEDs) Solder resistors R40 to R55 at time of control surface construction. This is because these resistors need to match the brightness of the LEDs you choose to use in your control surface. People who are...
- Page 10 IC socket. Completing the Base PCB in Stages Since this PCB combines multiple MIDIbox modules, if something should not work first time, it is much harder to troubleshoot (debug) because you cannot disconnect the modules. So it is perhaps best to construct the base PCB in stages and test after each stage.
- Page 11 2020/11/08 05:18 11/13 MB-6582 Base PCB Construction Guide As mentioned before, soldering in a shortest-to-tallest order lets you do soldering in batches, so you should still use this soldering order also. So to be more specific about the order to solder, here's a more comprehensive list: All resistors that are mounted flat (except R40 to R55)
- Page 12 For people experienced enough to fully populate the PCB without any more help, I'll quickly note some extra info here: The J3_SIDx and J23_SIDx headers on my MB-6582 are for connecting the audio input/output to dual- gang 500k pots for feedback into the SID and creating cool sounds (distortion or resonance boost or self-oscillating filter!).
- Page 13 2020/11/08 05:18 13/13 MB-6582 Base PCB Construction Guide Base PCB Revision 1 Errors http://midibox.org/forums/topic/9091-mb-6582-base-pcb-errors From: http://www.midibox.org/dokuwiki/ - MIDIbox Permanent link: http://www.midibox.org/dokuwiki/doku.php?id=wilba_mb_6582_base_pcb_construction_guide Last update: 2012/05/04 00:38 MIDIbox - http://www.midibox.org/dokuwiki/...
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