[sdiy] Morley flanger clone questions

[Scott Gravenhorst]

I think that R45 and C27 provide brute force decoupling - a kind of mini
isolated power supply for U6.  This is the exact same technique used to
reduce soft synch between the VCOs of a FatMan.  So yes, I think it should be
47 ohms.  When U6 demands a large (relative term) current spike, it can draw
most of it from C27 and R45 then recharges C27.  This avoids allowing that
spike to be propogated to other parts connected to the supply.

In fact, a FatMan mod that might also apply here is to replace the resistor
with an LED.  In the FatMan, this reduces softsynch to almost nothing.

"Pat Kammerer" <spivkurl at wearerecords.com> wrote:
>Hello all,
>
>My latest project is a clone of the Morley Saphhire Flanger, using this
>schematic:
>http://www.morleypedals.com/sfbes.pdf   This is the most complex stomp box
>circuit I've built, and I've got some problems with it. I have it on my
>breadboard right now. I would like to modify it and make it a module
>eventually
>
>The LED is showing a sweep which corresponds to the speed and travel pots,
>so I think atleast part of the circuit is working well. I just don't get a
>flanger sound. When the switch is set to flange, the output sounds filtered,
>but not in motion.
>
>I've got a couple questions that someone with more experience may be able to
>answer.
>
>Firstly... Could R45 actually be 47ohm, it seems very small. (This is the
>resistor between + supply and several pins of U4 and U5) I was thinking
>maybe it should be more like 47k.
>
>Also... I am using banana jacks to connect signal and ground for input and
>output, because my sound source is my modular synth. I know that there is
>some sort of switching going on in the jacks of the original circuit. Is
>there something I need to change when using a jack without switches? (Other
>than having to remove the battery when finished :b )
>
>Thank you to anyone who can help me!
>

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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