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 Forum index » DIY Hardware and Software » fonik's place
MIDI2CLOCK Build thread
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Cynosure
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Joined: Dec 11, 2010
Posts: 736
Location: Toronto, Ontario - Canada
Audio files: 42

PostPosted: Thu Nov 10, 2011 7:39 am    Post subject: Reply with quote  Mark this post and the followings unread

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.
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diablojoy



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PostPosted: Fri Nov 11, 2011 1:46 am    Post subject: Reply with quote  Mark this post and the followings unread

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


Quote:
power the sequencer parts of the lunetta using 0V on the Vss instead of -5. Then I can use the 5V option.


cynosure if that is possible to do with the particular lunetta sequencer's
it is not a bad option, though i cant imagine the cct was designed with -5v in mind and there not being a good reason for it [dual rail opamps somewhere ? ] otherwise you could go with a small interface to
offset the pulse voltage to the correct level as in matthias's option D
which maybe the better deal and easier
you could try the M2C with the 5v output first and see if it will clock your lunetta as is , I dont think it would harm anything [ guessing here really ]and if that does not work then tack a small interface cct on the front end of the lunetta to offset the level to -5 low to 0v high

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fonik



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PostPosted: Fri Nov 11, 2011 2:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Cynosure wrote:
The CMOS chips run on +5/-5, so the logic signal is a total of 10V.

so Vdd is +5V and Vss is -5V.
however i have to correct myself. the threshold of i.e. CD4017 would be at approx. +2V then. (High Level Input Voltage is 7V for 10V operation according datasheet).
so just be sure to not exceed the +5V on the lunetta's input.

sorry for the confusion.

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diablojoy



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PostPosted: Fri Nov 11, 2011 8:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
however i have to correct myself. the threshold of i.e. CD4017 would be at approx. +2V then.


Doh i should have seen that as well Embarassed
So the M2C should clock the lunetta fine with its outputs set at +5v

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fonik



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PostPosted: Sat Nov 12, 2011 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

cynosure, are you still there? Very Happy
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Cynosure
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PostPosted: Sat Nov 12, 2011 10:06 am    Post subject: Reply with quote  Mark this post and the followings unread

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.
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fonik



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PostPosted: Sat Nov 12, 2011 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cynosure wrote:
...I can easily breadboard a 5/0V clock pulse to test it out.

yes, this would be good. i wonder if the 0V is low enough for the CMOS powered by -5V/+5V...
if not you will have to do it the way i recommended: use 0V/10V triggers and move them down to -5V/+5V on the lunetta side.

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Cynosure
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PostPosted: Sun Dec 18, 2011 8:57 am    Post subject: Reply with quote  Mark this post and the followings unread

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!
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