Another guest appearance by Sebastian who generously shares his interesting designs!
Here is a snippet of his description for it:
...hybrid of the F'Deck (series 3) and the Broughton high-pass filters. I wanted the steeper slope of the F'Deck (24db/octave below 35Hz) with the gain boost of the Broughton—so, here it is!
Very happy to contribute, Anders! I hope others find this one as useful as I have. Not the most intriguing or exotic circuit, but indispensable for all the stoner & doom folks out there: it *really* helps cut the mud, stopping the guitars & bass from stepping on each other, plus makes your speakers run more efficiently (and, thus, more loudly).
ReplyDeleteplanning to add to this build a split and blend with phase inverter to make a really useful bass tool!
ReplyDeleteI would actually recommend NOT doing that. It IS a bass utility pedal: it's a high-pass filter to cut the subsonic frequencies that waste a lot of energy & that speakers often have a hard time reproducing. A blend would only reduce the effectiveness of the filter, and a phase inverter would (more or less) cancel out the main signal & leave only the unwanted subsonic frequencies.
Deletethe thing is, this is going to go in a signal splitter, one is going to this efect and then to a send (pedalboard) then the return would be mixing with the clean signal. So in the bass wouldnt be any low signal messing with the distortion and modulation and I would have the clean signal untouched.
DeleteOkay, there are a few things to explain in this case...
Delete1) this pedal is a simple EQ pedal that only does one thing: cut frequencies below a certain threshold. Blending an EQ'ed mono audio signal with a "clean" mono signal will, at best, minimize the effect of the EQing or, at worst, create some strange comb-filtering because of the unequal phase relationship between the two signals. Here is a quick explanation of what comb-filtering is—
https://www.youtube.com/watch?v=osig1c4QcmI
2) adding a phase inverter to this pedal and blending it back with the uneffected signal will be adding 2 identical *but out-of-phase* signals to each other, which will result in signal cancellation. Here is a quick explanation of polarity & phase in audio signals, and how signal cancellation occurs—
https://www.youtube.com/watch?v=IrXHVWPGdeQ
I understand what you're trying to achieve here, but the best use of this pedal in a bass signal chain is in the last place on your pedalboard, right before going to the amplifier. Think of it as a "mastering" tool for your bass signal, coming *after* all the other mixing & effecting has been done.
ive used the broughton high/low pass for this apllication and it worked great, but found that the low pass to be useless in my case. I dont know why this case would be otherwise
DeleteAlright, do what you gotta do.👍
DeleteIve build it and it works as i thought. Ive raised the hp cut frecuency, and now I have all my pedals working without low end messing with the distortion, and a clean bass mixed at the end. also conected 2E into 2G, seemed to be that way in the schematic. Really useful for the aplication I was thinking of! thank you Sebastian!
DeleteExcellent! Clearly, abstract debates about use don't matter if it works in the real world, ha ha ha!
Deletefollowing up with this, Ive end up using this layout and replaced the high pass filter with a low pass filter; and with the one Ive built previously, and with a two loop mixer with phase inverter, Ive build myself a KMA tyler. It works really well!
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