Morley Crystal Chorus Box - VERIFED

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Morley Crystal Chorus Box - VERIFED

chance
This post was updated on .
Hi guys,

I have 3 layouts for the Morley Crystal Chorus Box based of the factory schematic dated 08/05/1996. One layout is as per factory schematic, no true bypass, no mods. A second layout is a true bypass version and the third is with true bypass and 3 mods. One is the intensity mod which I have seen on Boss CE-2 clones, either change the value of the 5p cap or add another in parallel; not too large in value. Second mod removes  the dry signal 'vibe' mod. There is also a 1M pull-down resistor on the modded version, whether you need it or not on this build I don't know. If you don't need it then leave it out. The pull-down resistor is not on factory schematic or true bypass version but the space is there if you need to install it. Run this off regulated neg tip 9v dc. Also on layout is information regarding second output for stereo which can be utilised without a daughter board or left out providing you amend a certain jumper.  D1 1N4003 can be substituted with 1N4001. MC3403 can be replaced with another quad op-amp like LM324. As of 15/11/2017 this layout is now verified. If you downloaded the layouts I posted prior to this date please download these newer ones as there were 2 critical errors which I have corrected. The worst one was a missing cut beside pin 4 of the MN3207 which shorted the power. The other was the placement of the 1M8 resistor connected to IC3 which involved shifting a link and 2 resistors slightly. Use the newer layouts as reference in case you have already started on the boards. Mine is not boxed yet but sounds good, I have not found a single demo online for reference. I will post up a layout utilising MN3007 BBD instead of MN3207 soon. 17/11/2017 UPDATE: Please ditch layouts uploaded prior to this  date, when I made the corrections mentioned above 15/11/2017 I forgot to update the unpopulated boards also. They are all good now.
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Re: Morley Crystal Chorus Box

chance
Here is the schematic...
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Re: Morley Crystal Chorus Box - VERIFED

chance
In reply to this post by chance
LM324 works fine as a substitute for MC3403, lot of depth in this, intensity mod is not necessary really. Sounds really good, no noise. Trimmers are best about dead centre. Might look at a level control though.
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Re: Morley Crystal Chorus Box - VERIFED

chance
In reply to this post by chance
Actually there is a demo by gearmandude. I like this thing better than my Boss CE-2 clone.
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Re: Morley Crystal Chorus Box - VERIFED

Mark SL
In reply to this post by chance
What is up with the 1.8M resistor on the bottom right ad the double link jumper that are supposed to go into the same hole? The cut and jumper layout has a different setup than the one with the components.
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Re: Morley Crystal Chorus Box - VERIFED

chance
Aah, thanks for spotting this, I simply did not update the unpopulated boards after I cmade the corrections yesterday. Stand-by for a quick update...
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Re: Morley Crystal Chorus Box - VERIFED

chance
In reply to this post by Mark SL
Layouts now updated, good spotting. I have got too many projects in my head at the moment, cheers!
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Re: Morley Crystal Chorus Box - VERIFED

chance
17/11/2017 UPDATE: Please ditch layouts uploaded prior to this  date, when I made the corrections mentioned above 15/11/2017 I forgot to update the unpopulated boards also. They are all good now.