please be aware that you need +5V / +12V / -12V for the SEQ + AOUT module, which is not provided by the product in your first link.
I used this one, but I am not sure how bad the switchmode supply affects CV output, gotta scope it @ some point in time, probably you can filter/smooth the switcher ripples with caps…
If you find a quiet enough switcher you can easily make +/-12V from +/-15V with a couple of regulators. You can even use them in a small transistor package instead of a full TO-220 since no big amount of power is necessary :sorcerer:
For the PSU you use hawkeye, you don’t use an AOUT module ?
And what is caps ?
Jojjelito : Switcher are noisy ? so as you said the better way is to buy a psu with 5V and +15/-15V and regulate it at +/-12V ?
I don’t know how much power could take a SEQV4 + AOUT Module and BLM ?
I have another question : i will use my SEQV4 sometimes with a generator (Petrol -> Electricity coz there is no other choice in the forest !) But theses generator are not regulated, and i know that with a switching psu, there is some risk to burn all, the better is a normal psu, do you think i can use another kind of PSU ?
i think i’ll buy the same psu as you for start now, but i want to modify this quickly ! So i want to learn how it works !
Some switchers are switching at a low frequency like 60kHz or even less. Sometimes even with large ripple. This is not good as noise can enter the audio band if you don’t know how to decouple things. A higher frequency switcher is no problem.
But, given that you might need +/-15V if you also use analog gear, and also that 15V is more common, there’s always the option of using a small regulator to take 15V down to 12V. Those 12V are only used for the Aout that needs 100mA or less,
The MB-SEQ uses 5V, but more current. I would assume max 500mA if you count the backlights for displays plus lots of LEDs which are PWM:ed but still… It probably needs 200mA but it’s good to have some margin. I don’t know how much the BLM needs, maybe someone has made some measurements?
Any PSU that provides ±12V and +5V is good if you can find a nice one.
i finnished the constructon of the LPC17; but i have a problem !
actually the board is build, and the LCPxpresso is cut in two part, and ready !
So i tried to test if something work ! But i flashed the LCPexpresso (I think it’s ok) and i put in on the LCP board !
I don’t know if it works, when i put the USB cable in it (power by usb), the card light for 1 second and stop, and i din’t see any device on windows or something like that.
if i put the other part of the board and the toher mini usb ( So one USB come from PC to LCP17 Board; and one for the PC to the second part of the lcpxpresso), all the light are lighting (lcpspresso led in continu, and ethernet in continu), if i unplug the usb of the LCP board it’s the same, but if a connet only the USB from computer to the LCP17 board, i have just this flash of 1 second and nothing more…
What i can do to test if i did something wrong ?
Problem solved by check (Again and again) on my solder point.
Finally, i upload the SEQv4 loader with MIOS Studio, and it seems to work !
Now i´m a bit lost cause i have the Wilba pcb with all the part mounting on it. i also have mounted some din and dout modules to fit with it, but i understand recently that i don´t need it with wilba pcb…
So now i have my LCP 17 ready (i think) and the wilba PCB ready too.
What i have to do now ? i´m building the SD Card reader.
so now ???
i think i have to do this but maybe i´m wrong :
connect a SD CARD to the LCP17 and load the SEQV4 files on it.
OK, i finished th SD card reader, so i put the MBSEQ_HW.V4 file on the SD card, i plug it on the adaptator and i connect it to J16.
i pluged the USB :
The led on the LCP1769 (half module) is flashing (on off) everytime, and the ethernet port (green) are lighting, but my computer didn’t detedt any SD card (it just sound like “windows has detected something”, but nothing more.
The SD card won’t show up in Windows unless you activate the MSD USB option from the SeqV4. You may try the mass storage device app from here http://ucapps.de/mios32_download.html if you want to test your SD card wiring.
Have you verified your wiring for the LCD? Does the SeqV4 show up in MIOS Studio? You should be able to select the midi ports - see if the Seq responds when you type ‘help’ in the console there.
I have some construction questions as well, but did not want start a new thread. I accidentally switched the voltage regulators so I had to cut out the L7805ACV and now I can’t solder it back in. Is this the same part?
Also, since I have no idea when a front panel and case will be ready. Is it imperative that the control pcb is unpopulated before I attach it to the panel with JB weld? I’m guessing it is not. Thanks.
i pluged the lcl, but the light extremly low. at the beginning i thougt they didn’t worked, but they work !
Is the backlight current actually fed through the DIL connector terminals, or does this LCD provide/require separate terminals ([K]athode and [A]node) for the backlight?
Is the backlight current actually fed through the DIL connector terminals, or does this LCD provide/require separate terminals ([K]athode and [A]node) for the backlight?
i connect the lcd, via a DIL connector, and yes i have 2 pins A and K, but they looks like integrated on the DIL connector.
!) But theses generator are not regulated, and i know that with a switching psu, there is some risk to burn all, the better is a normal psu, do you think i can use another kind of PSU ?