external sync instead of 555 timer?

the19thbear · Joined: Apr 19, 2007 Posts: 79 Location: denmark

Hi. I have a Elka wilgamat III
Im trying to sync it up via an external sync ( a metronome from my DA on my pc). But it wont work.. this works fine on my juno 6.

Could anyone tell me what i need to do to get it working?
As you can see the 555 timer is feeding a "sync out" and the CPU that sends pulses out to everything.

I tried inserting the metronome signal on the pin that says 17,5 on the 410CST1474(the top circuit), because it leads directly to the CPU coming from the 555 IC (IC 7) and also on right after IC's output (the sync signal comes from the 555 and goes into IC 9 and out)

Thanks:)
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If i want to go the midi way could i then use this?
http://m.bareille.free.fr/mc628/mc628.html

JingleJoe · Posted: Sat May 26, 2012 4:09 am Post subject:

One would first have to disconnect that 555 timer and make sure the substitute metronome is the correct voltage.

Uncle Krunkus · Posted: Sat May 26, 2012 4:55 am Post subject:

I'm guessing that the metronome "signal" is not a simple 5V trigger such as I'm expecting that 555 to put out.
And that's about all anyone can say without checking out your (midi driven?) metronome signal.