Core, no connection

MIDIbox HUIs
1

I am building a MB64 with modules from SmashTV

I have already built 2 MB SID’s so I am familiar with using MIOS studio

I have built the Core, and MIOS Studio can’t connect to it.

On the Core I have left out the Bridge rectifier, the “huge” el.cap, C6, voltage regulator, transistor and pots

As I understand these parts are for powering the Core and for the LCD, is this correct?

I am powering the Core from another 5V source, and I am not using a LCD

+5V and Ground connected to the voltage regulator position

I have checked all solder joints, tried with another PIC and another Optocoupler

Checked the MIDI sockets etc.

My MIDI interface and cables works fine with MIOS on my MB SID’s

any suggestions?

2

Did you connect to the output pad of the voltage regulator? Alternatively, try connecting your 5V power to J2.

3

thanks

I have tried that now, but no difference

I have meassured voltage to the 2 places on the PIC and on the Opto, all fine

I can’t see how the parts I have left out can affect the MIDI

could it be the crystal?

4

DUH!

It was the MIDI connection pins

For some reason I assumed that the pins corresponded to the holes for the MIDI sockets, but it’s the opposite

Up and running :slight_smile:

5

Glad you solved it :thumbsup: