MIDI2CLOCK Build thread

Cynosure · Posted: Thu Nov 10, 2011 7:39 am Post subject:

Ok. then maybe I will do this - power the sequencer parts of the lunetta using 0V on the Vss instead of -5. Then I can use the 5V option.

diablojoy · Posted: Fri Nov 11, 2011 1:46 am Post subject:

yes matthias that does sound right
was just stressing the importance of not exceeding the rail voltages
would really help to know the ccts cynosure is driving
it could be a 4017 based sequencer running on +5/-5 or equally it could be +5 and 0v with the -5v only used elsewhere

fonik · Posted: Fri Nov 11, 2011 2:04 am Post subject:

diablojoy · Posted: Fri Nov 11, 2011 8:24 pm Post subject:

fonik · Posted: Sat Nov 12, 2011 7:09 am Post subject:

cynosure, are you still there? Very Happy

Cynosure · Posted: Sat Nov 12, 2011 10:06 am Post subject:

Sorry - I was entrapped with soldering a wasp filter (your name on the schematic Matthias, so thanks for that one too).

The thing that the clock will actually be triggering is a 4040. I know the MIDI2CLOCK has a divider in it, but i included one in my sequencer too for use when clocking from other lunetta devices. The output of the 4040 then goes to a 4029, which is decoded using a 4514.

Thanks for the info. I don't have the MIDI2CLOCK soldered up yet (working on the synth/sequencer it controls first), but I can easily breadboard a 5/0V clock pulse to test it out.

fonik · Posted: Sat Nov 12, 2011 2:33 pm Post subject:

Cynosure · Posted: Sun Dec 18, 2011 8:57 am Post subject:

FYI. Now that the cmos synth is done, I have tested it out with a 40106 clock on breadboard using a 9V battery and a 7805. It clocks the sequencer if I add a capacitor to the +5 clock pulse and don't use the clock to also power an led. Maybe a current issue?

Anyway, it should work with the 5V option on the midi2clock pcb once I get around to soldering that together. At most, i might need to add a cap on the output.

Thanks for the help!