Shuriken

You need to upload the application via either MIDI or the USB port on the MB_CORE_LPC17 board, so not via the usb on the LPCEXPRESSO board.

If you go to the external menu, you can control up to 8 external CV: The witches are optional and not implemented. As you have only 2 CV Inputs, this should be more then enough.

A AOUT_NG would be the way to go. The LC will work too, but is more expensive. As for controls, please read the CV part of the MBSID V2 manual.

I go with Iluminator too. One or if right price then two.

It is probably stocked with a couple of swinsid as well.

Very nice Orange_hand. Good Job.

To further nitpick :wink:, that Sammich uses the TA12 series. These are 5,70mm width, the TAC series which are used in the Shruthi are 5,5mm

For prototyping i use the toner transfer method. However if that is successful i def. want to try Laen's service. Those pcb look really good.

Looks good. I did some similar pcb making with photopaper. But lately the results are less then optimal. Maybe i give this vinyl foil a go. Now where do i find Oracal 641 in W-Europe....

Jsynthlib is rather old and pretty much depricated. Have a look at: CTRLR. There is a Matrix 1000 and a TX81z controller. The other ones you can look for on their forum or perhaps make it yourself.

Apperantly the early ones were. I think it would probably take a Dremel to the mainboard first. Then use a solderiron.

This blog entry is all over the place. First it almost seems like the Midibox Synth fault he is more into building then composing. Then he goes on about building stuff for other people and restriction on sales. Then there is a tantrum about documentation. And i am not really sure what the point is of this blog. But it seems to me the blogger actually likes building stuff, thinks he is good at it and would really want to make a business of it. A little quote: So even though the license is there to protect the Midibox platform from being used and abused by uncaring capitalist interests; it ultimately caps the size of the community of Midiboxers by forcing any and all users to be technically competent, musically inclined, and with plenty of time to dedicate to a complex electronics project. People who are just interested in the technical, or just interested in the musical, or who just don't have the time or space to do it need not apply. Maybe the blogger just misses the point. I think the goal of midibox is not world domination. :wink: I think it is about a thriving community who are involved in technical and musical aspects.

Not sure tbh. The MC3423 datasheet is quite clear. However reading the MC34161 datasheet i am not so sure it will or can do the same.

I agree the example is a bit over the top in comparison to our usual designs. But a 5V TVS looks like a pretty small device, with no heatsinking. So even 20W will be to much to handle. It will probably result in a big burn on the pcb :wink: Tbh i think a TVS is only usefull in special enviroments. Like environments which have instable power. Or with mobile devices, which are not grounded. Which can be more vulnerable to ESD. For a net powered MB6582 psu, i think a crowbar will be sufficient.

Ok, i have been reading up a little bit on a TVS. Conclusion a TVS is not a replacement for a crowbar. a TVS is meant as protection for spikes. So for instance an ESD. It can withstand a peak current for a very short time (max 1ms) after that period the amount of current it can withstand dramatically decreases as it heats up. And eventually will be destroyed. A TVS will only clamp at the rated voltage and never become a short like a crowbar. A good example i found about the differences between the two: If you have a 15V supply and a 20A current. The TVS will basically have to dispensate 300W in a problem situation. Whereas a SCR will drop the current to 1A and has only 20W to dispensate. You will need a mighty heatsink to dispensate 300Wattz :wink: In one of the datasheets i found that one of the applications of a TVS can be to protect a SCR from (false) triggering. So i guess it is not about one or the other. But they basically complement each other.

You used a 5.6V Zener for +5V circuit? That has a 5% precision. So max. Voltage passing through is 5.88V. Datasheet SID6582 says VDD=9V+5%VDC and VCC=5V+5%VDC.

I bought some MC3423 at reichelt. However that IC is EOL. I seem to remember someone found an up to date solution from ONsemi.It was technobreath as i suspected

First of all i am not an expert. I hadn't heard of TVS before. But a TVS looks like to be protection from only a short spike. I did do a bit of research on crowbar designs. You can make a simple crowbar with a zener and a scr. The downside of a zener is they only come in specific voltages (same as TVS as it seems) which makes it a bit inflexible. So there are are more intricate design which utilize an IC instead of a zener. Onsemi makes a couple of good ones. But in the end it all comes down to how much it costs to replace what is behind the PSU. Is it worth the additional cost of the protection. The main reason i started to look into a crowbar is that 8 x SID is a lot of money. I don't want to blow it up with a 20 year old C64 psu.

Do you mean a CV controlled filter by use of an AOUT module?

Using 15VAC to make 15VDC is fine (15V * 1.4 - 1.4 = 19,6V Rectified) that's about 1,6V of head room.

Nee zijn opzich niet kant en klaar beschikbaar. Waar zat je uberhaupt aan te denken? want midibox is een breed begrip.