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 Forum index » DIY Hardware and Software » YuSynth
VCA strange behavior + gate signal, help please
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isak



Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18

PostPosted: Mon Jul 29, 2013 1:00 pm    Post subject: VCA strange behavior + gate signal, help please Reply with quote  Mark this post and the followings unread

Hi Yves and guys.

Have this strange behavior when connecting the ENV to the vca.
All the Env is short, no matter if the switch is on short or long.
When connect the env to a vco or vcf it acts like it should, only in the vca it's to short.
How can I fix it?
I must add that if I connect an lfo it's working as it should.
the cv in resistors is 68k like the scheme says.

In addition,
I'm trying to connect a 5V gate to the cv in but I get nothing, the vca is not opening.
Should I use higher V gate then 5V?

cheers,
Isak.

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isak



Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18

PostPosted: Tue Jul 30, 2013 7:47 am    Post subject: Reply with quote  Mark this post and the followings unread

ok, i found the problem with the gate, it seems that i need to lot more then 5V to open the VCA.
i found MFOS scheme that can boost the 5V gate to 10V or more.

my only problem now is the strange behavior of the ENV on the VCA.
any ideas? scratch

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yusynth



Joined: Nov 24, 2005
Posts: 1314
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PostPosted: Wed Jul 31, 2013 4:00 am    Post subject: Reply with quote  Mark this post and the followings unread

It looks like you adjusted A2 much too low. Did you adjust the INIT level trimmer as explained ?
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isak



Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18

PostPosted: Thu Aug 01, 2013 3:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

yes i did, few times cause i wasnt sure about it.
i took the Arp 4072 self osc and with that i calibrate the VCA.

in addition.... if i turn the attack pot all the way up the the sound would not start, only after 3 or 4 sec its starting, the attack lasts only 6 sec when the switch is on slow mode.

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