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Anyone ever try to mod an EHX Frequency Analyzer?
MUFF WIGGLER Forum Index -> Guitars, Basses, Amps & FX  
Author Anyone ever try to mod an EHX Frequency Analyzer?
hippo1
(Not sure which board to post this, exactly...)

I'm in love with the 'liquid-y' sounds of their original (or newer 'NY'-style) design. It's so much 'smoother' and 'wet' than many others I've used. A question to the larger DIY community: Could you replace the control pots with jacks, normalized (either internally, or externally with VCAs for example) for continuous, controlled changes; allowing for Euro/modular control?

The caveat to this is: I suck at soldering/modding. I know; I guess it's time to practice, practice, practice. I'm wondering if anyone's beaten me to the punch. It SEEMS a straightforward mod: no fooling with alternate componentry/resistance diffs/etc; just the removal of pots, and replacement of jacks (wired or direct).
digitalganesha
I've never even thought about it because of the insane 40V power supply the Frequency Analyzer uses. Someone with much more knowledge would be better to answer this and maybe ease my concern over that power supply draw being a potential hazard.
depth20
Does the new smaller pedal sound as nice as the old? Borrowed one years ago and it sounded really nice. Very hard to tune though, so I never got one.
hippo1
I must admit, the one I want to mod IS the 'new' one (NY style enclosure); still w/the 40V supply. And yes, the difficulty in tuning it is precisely why I would like to get CV control of the actual pots. I know, subjective; but for me, this pedal has the MOST liquid-y feel to the sound of any ringmod I have (multiple diff mfr's, in Euro).

...I'm guessing that one of its advantages over others IS the headroom offered* by the 40V supply; that, or its actual componentry.


[* As I type the word, I pause: 'offered'? 'Of Fred'? I'm watchin' too much Margaret Atwood, here...]
digitalganesha
As always, the sound is all that matters, and the FA has that classic "bonky" (sounds right hihi) 70's ring mod sound. Everything else made now has the "modern" (the made up word for this would be "shurvv") sound.
digitalganesha
depth20 wrote:
Does the new smaller pedal sound as nice as the old? Borrowed one years ago and it sounded really nice. Very hard to tune though, so I never got one.


If I recall, essentially the same circuit is in the small box. And if I sonically remember, they do sound quite close.
R.U.Nuts
So you want voltage control over the modulator VCO frequency of the FA so it'll track along a VCO from your modular? Maybe you can implement voltage control but I doubt it'll track 1V/oct. I'd rather look for a hack that replaces the signal of the FA's internal VCO with an external signal so you can plug two VCOs from your modular into the FA.
moylando
Assuming the version in question still uses the ICL8038 (which is currently obsolete) as its internal oscillator it might be possible to have some voltage control. However, the scale will certainly not be V/oct and the usable range of voltages is unclear. The currents through the resistors on pins 4 and 5 set the frequency of the oscillator.

If the hope is to use something like a step sequencer than it's probably usable, but the whole range of the sequencer knob might not be.

Also, a better solution than replacing the pots might be to use a switching jack so that when nothing is plugged in to the jack the panel knobs continue to work as normal.

Schematic I've seen online suggest +-15 supplies so any positive voltage coming from a modular should be safe, but maybe not negative voltages. Adding a diode might be a good idea. Seems like the 680 on each pin is high enough not to exceed the max current since turning the pots to max frequency essentially would put +15 directly on those resistors.
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