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 Forum index » DIY Hardware and Software
Help needed: Calling all jupiter 4 owners
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the19thbear



Joined: Apr 19, 2007
Posts: 103
Location: denmark

PostPosted: Fri Sep 21, 2012 12:27 am    Post subject: Help needed: Calling all jupiter 4 owners Reply with quote  Mark this post and the followings unread

Here goes:
If i turn the LFO RATE pot up and down i get no change in LFO speed. If i turn the LFO BEND up and down (the one located left to the LFO rate pot) i get a change in lfo rate, but i have to have the "normal/wide" switch set to "normal" to be able to change the LFO rate.

It seems the LFO RATE is broken somehow, and before i try to fix it, i want to know how this synth is supposed to work.
Is it normal that you can change the LFO rate with the LFO BEND pot?

UPDATE:

Ok. Fixed it. A bad opamp.
And apperently the LFO bend IS in fact for controlling the LFO speed. Have a look at the jupiter 4 demo video from retro sounds on youtube. My J4 behaves the exact same way now.
What about the LFO in general. If i set the LFO to square wave, MEDIUM SPEED, and set the VCO OSC. waveform to OFF, (sub osc OFF too) and th VCF LFO MOD to MAX. do you get clicking from the LFO?
On some synths this is normal, on others it might indicate old caps..

Thanks alot!

Last edited by the19thbear on Fri Feb 15, 2013 3:01 am; edited 2 times in total
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the19thbear



Joined: Apr 19, 2007
Posts: 103
Location: denmark

PostPosted: Tue Feb 12, 2013 6:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Bump
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radek tymecki



Joined: Mar 22, 2009
Posts: 70
Location: PL

PostPosted: Tue Feb 12, 2013 12:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

no it should change amount of modulation
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the19thbear



Joined: Apr 19, 2007
Posts: 103
Location: denmark

PostPosted: Wed Feb 13, 2013 12:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Thats what i thought.
Thanks a lot!
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the19thbear



Joined: Apr 19, 2007
Posts: 103
Location: denmark

PostPosted: Fri Feb 15, 2013 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok. Fixed it. A bad opamp.
And apperently the LFO bend IS in fact for controlling the LFO speed. Have a look at the jupiter 4 demo video from retro sounds on youtube. My J4 behaves the exact same way now.
What about the LFO in general. If i set the LFO to square wave, MEDIUM SPEED, and set the VCO OSC. waveform to OFF, (sub osc OFF too) and th VCF LFO MOD to MAX. do you get clicking from the LFO?
On some synths this is normal, on others it might indicate old caps..

Thanks alot!
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