[sdiy] MFOS Seq ext clk in

[Tom Adam]

Guys,

I've got some issues with the external clock in of my MFOS 16 step
sequencer.
When I was building it, I checked this input with my function generator and
it was working perfectly. But when I connect an LFO (CGS/MOTM) or similar,
it's not working. Also when I use an arduino midi to analog clock thing,
it's not working.
Is this normal behavior? All other features of this seq are working OK.

I was checking some signals and I found that I need a rather large 10Vpp
signal to get the external clk in to work. I don't remember if it was a
0-10V or -5 to 5V signal, but I can check that again. 
So now I'm looking for a solution for this. I would like to use my LFO's and
arduino to drive this sequencer. Should I just use an amp with some level
shifting? What if I drive it with a sine wave instead of a square wave?

BTW On the schematic it says "CMOS levels source and sink expected". 
http://www.musicfromouterspace.com/analogsynth/SEQ16_2006/SEQ16_2006.php

Any help appreciated!

Cheers,
ToAd 
www.thebigear.be