mda

Thanks Matt. I think it might be possible to adapt the circuit above to supply 12v (well 15v?) and 5v, instead of your 9v and 5v. Then I could just use 7812's for the old sid chips and 7809's for the newer ones on the relevant individual sid_boards: http://ucapps.de/mbhp/mbhp_sid_v3.pdf Does this make sense? If so, would it simply be a matter of replacing the transformer with a different one with a higher voltage output (and any relevant fuses)? e.g. this one? 15v in seems ok for a 7812, would the 7809's handle that? or I should I take the input for the 7809's from the output of the 7812s? The problem with the 15v transformer above is the current is about half the output of that on your 9v... although if that's not enough I could always just use both of the 2 outputs (half the sids each). That would be enough once I eventually get all 8x sids, and the full control surface right? I realise that's a lot of noob questions in one go, but any input from previous posters or new in this thread would be appreciated. :-) Thanks

Thanks for all the input. As i'm building mine in the old school modular way - I can't afford to do it all at once - I would need to add the 9v and 5v myself, giving me 12v for the 6581s, 9v for the 8580s and 5v for the cores. I presume this could be done as on the optimised PSU, tapping out the 9v before the addition. Is there a circuit diagram for how the MB6582 achieves this? Thanks again,

Any news on your power supply? Working? @Orange_Hand - As you're in the UK at least I know the input voltage would be correct. I would need 12v, 9v and 5v though, as I will eventually have a mixture of both types of SID. Would I just need to duplicate the 9v section with different mini PSU to produce the extra output? Thanks

Thanks nILS... I know... it was a stupid question. I knew that the current was a max value, but had a moment of late night doubt and better safe than sorry hey? I still always have to check which way round the impedance of speakers can be if they don't match (greater or smaller than the amp). Every single time! I've built a few electronics projects before: 2 theremins; a CV to MIDI converter (which I used to have the game twister control beat-slicing, time-stretching and glitch effects in Max/MSP); a compressor; hacked my wah pedal to work better with my clavinet; amplifier; ring modulator; timer based oscillators; tape-delay; chip based 8-bit sampler (which I did design myself very slowly); USB footpedal; MIDI controller for Ableton Live and so on. However, except for the simple projects and hardware hacking, I have just built circuits from instructions, with some small adjustments. I've never had to fiddle with mains related stuff, which is why I want a pre-built AC->DC power adapter between the mains and my circuits. :) Thanks for the heads up Gilejuk, it seems from the update at the bottom of that article there is a replacement which is reliable: http://eshop.macsales.com/item/Other%20World%20Computing/ELITE4SAUS/ So, as I'm now slowly getting my head around it by looking through old posts here, googling and books, it looks like I am going to go with the above adapter and: Include HF filtering capacitors (2x 2200uf electrolytic and 1x 220nf /330nf polyester) Include 2x crowbar circuits (12v and 5v) to be extra safe Remove the part of the circuit combining the 9VAC and 5VDC from the mbhp_8xsid_c64_psu_optimized.pdf Can anyone please answer any of the following: 1) Am I right in concluding that I don't need a 7812 in my circuit or the 7805 in the Core circuit as the power supply (ELITE4SAUS above) will be regulated enough already? And looking at the following circuit: http://en.wikibooks.org/wiki/Practical_Electronics/Crowbar_circuit 2) Can anyone suggest values for SD1, Q1 and C2, or point me in the right direction for research? 3) Should I use resettable or regular fuses? Or both? 4) Is there a crowbar circuit floating around here that others have used that I can compare to this one? Thanks again :)

Hi, I have read round and round the Power Supply topics and am still stuck as I have not had to build or adapt a power supply before. So have a few questions... I would like to keep my power supply simple for now, but with the option to add more SIDS of different types easily later on and eventually a full control surface. My current SIDS are 6581s. Could this be used instead of the original C64 power supply, with the optimized 8xSID PSU circuit starting with 1 Core, a Stereo Pair of 6581 SIDS and the Minimal Control Surface (LCD etc)? http://www.amazon.co.uk/Lacie-Model-ACU057A-0512-Adapter-equiv/dp/B004VL5JV4/ref=pd_cp_ce_2/275-2315380-3087453 Later if I add another Core and Stereo Pair of 8580s, could I then add a circuit / transformer to derive the 9v from the same power supply? My two main concerns are: whether the current is overkill, and whether because of this the chips will overheat. Would the extra current be available, but not drawn initially (with my original set-up), or would the Chips be forced to drain the spare current? Thanks,

Hi, I am just about to begin building a stereo SID (2x 6581s) and will add 2x 8580s in the future for the best of both worlds when I get my hands on a couple. As I am still waiting for some of the minimal control surface parts to arrive (and a replacement power supply) I was thinking of getting started building an Editor in Max/MSP, so I can start playing straight away via MIDI before I finish the control surface. I've got the SID_V2 parameter / CC / sysex implementation charts and am gradually getting my head around them (adding for left/right/stereo's a bit confusing at first glance, although still need to re-read the walk-through a few more times yet still). Brings back fond memories of building mixermaps in Cubase on the Atari and programming the Kenton Control Freak to get at all the hidden features on the MC303 and other gear I haven't used in years. Any advice on using CCs over sysex or vice versa with regards to 7bit vs 14bit ranges (are the limited 128 values noticeably stepped for example)? Any other advantages of one way over the other? Or should I just plump for the best resolution regardless? Most importantly, has anyone already built any Max/MSP patches for the SID_V3 or will I be starting from scratch? I realise there's now the ctrlr editor, but Max/MSP will allow for some crazy controlling of the SID... Thanks :-)