Frequency interchange

Mentaltossflycoon

Mentaltossflycoon

Well-known member
So I've been on separate hunts for both hpf and lpf for differing (duh) purposes, meaning I intend to put the lpf after dirts, somewhere before or after modulations but before delay. The hpf would go at the very end of the chain. This thing is a winner in both categories and will likely be my end of chain hpf.

I built the electric druid filterfx a while ago and it's what I'll use for my lpf as it has the expression/lfo functions. I wish there was a best of both scenario but that's extreme nit picking. Comparing the lpfs, the frequency interchange all the way open with the level at zero offers little to no change to the sound while the filterfx has a distinct sound even all the way open so I wouldn't ever use it in any "always on" application. That goes for the filterfx hpf too. Filterfx = fun filter, Frequency Interchange = business filter.

I don't usually get that excited about utility type pedals but my rig sounds amazing with a little fat trimmed off the ass. Especially when the meatbox and octorock get stepped on. Less boom more oomph. Unnnngh.

So yeah, to my brothers in low end, go get yourself some of this goodness. I'm sure the guitfolk could benefit too. Another good one, thanks for throwing us this bone, @Robert

I was a little lazy and just typed "frequency interchange" into the AI app combined with random dead artists. Got a lot of interesting results. The box is a tayda chromium, I like the way my vinyl stickers looks on them but I'll never buy another. I was super careful and there's already 5 scratches on it. Only the winked for me going forward.

Screenshot_20230420_150458.jpg Screenshot_20230420_150444.jpg
 
Another pedal that had never registered in my frail consciousness. Those little frequency boosts/trims are really what take things from good to great I think, in ways that a typical tone stack just don’t. I agree about the “unexciting” aspect, but I’m sure the final result (hearing the chain) makes up for the initial lack of excitement. Nice looking!
 
I'm building this pedal right now and I have two questions:
  1. Do the 10u and 100u electrolytic capacitors need to be 50V like the PCB says? All I have is 25V and 35V
  2. In the original pedal the knobs work upside down, for the HPF the lowest frequency is at 11 and the highest is at 2 o'clock. Does the Frequency Interchange Filter work the same way? I need to know for the design of the enclosure.
Thanks.
 
@andare
1. Caps, I'm not sure. I just went with what was recommended. I ordered a bunch of 50v electros on sale a while back so I'm actually using them unnecessarily much of the time.

2. They seem to function like the original, just rearranged. I didn't look at the original so my knobs are pictured with the knobs oriented normally (min 8 o'clock/max 7 o'clock)so the lpf is currently removing more highs than the hpf is removing lows.
 
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Mentaltossflycoon said:
@andare
1. Caps, I'm not sure. I just went with what was recommended. I ordered a bunch of 50v electros on sale a while back so I'm actually using them unnecessarily much of the time.

2. They seem to function like the original, just rearranged. I didn't look at the original so my knobs are pictured with the knobs oriented normally (min 9 o'clock/max 7 o'clock)so the lpf is currently removing more highs than the hpf is removing lows.
Click to expand...
Screen Shot 2023-05-16 at 00.08.14.png

You can se the High Pass is designed to turn CCW from 11 to 1 o'clock and the Low Pass to turn CW from 1 to 11 o'clock. Gain is standard CW from 7 to 5 o'clock.
 
Mentaltossflycoon said:
@andare
1. Caps, I'm not sure. I just went with what was recommended. I ordered a bunch of 50v electros on sale a while back so I'm actually using them unnecessarily much of the time.

2. They seem to function like the original, just rearranged. I didn't look at the original so my knobs are pictured with the knobs oriented normally (min 9 o'clock/max 7 o'clock)so the lpf is currently removing more highs than the hpf is removing lows.
Click to expand...
Maybe the electrolytic caps need to be 50V because the pedal can be run at up to 24V?
 
Lovely build. I think your ass is fine with the fat on it, but I digress..

Maybe the caps are 50v because that was what was in the original? Robbo tends to stick to the original specs, even if they don't make sense. (PPCB has the purist market cornered!).
 
hey sorry for my uneducated question.... but what filter will work best to dial, while having low tuned guitar or bass , in order to get more low end or tighten a bit my sound? in my understanding, i need a HPF......... in another words, im after a control that will allow my distorted sound, from Black Sabbath to Meshuggah on a turn of a knob, if that makes sense
 
So the HPF removes bass. I use it to eliminate frequencies at the lowest of lows. This supposedly increases the efficiency making the frequencies you're letting through seem bigger.

As far as the sabbath/meshuggah sound, I can't really help you there. Not my area of expertise.
 
bilisnegra13 said:
hey sorry for my uneducated question.... but what filter will work best to dial, while having low tuned guitar or bass , in order to get more low end or tighten a bit my sound?
Click to expand...

One of these?
www.pedalpcb.com

Triangulum Boost - PedalPCB.com

The Triangulum Boost was inspired by a limited edition boost that is extremely popular among metal guitarists.
www.pedalpcb.com www.pedalpcb.com
www.pedalpcb.com

Isosceles Boost - PedalPCB.com

The Isosceles Boost combines two popular "metal" boosts and a classic preamp into one compact pedal.
www.pedalpcb.com www.pedalpcb.com
 
I see! Thanks....

But those are more like boost pedals... My idea was more like on some of the Lichlaerm audio pedals they have a so called " propetary cur control". Like on the Ritual ( rat based circuit ) to mention one
Is apparently a LPF or hi cut i guess
 
andare said:
View attachment 48702

You can se the High Pass is designed to turn CCW from 11 to 1 o'clock and the Low Pass to turn CW from 1 to 11 o'clock. Gain is standard CW from 7 to 5 o'clock.
Click to expand...
I'm sorry to resurrect such an old thread. I've been looking all over to figure this out. I'm planning to build this pedal but I want to know how I should label the enclosure. Should I label it as shown in the original pedal design? Or in some other configuration?
 
OrganMeat said:
I'm sorry to resurrect such an old thread. I've been looking all over to figure this out. I'm planning to build this pedal but I want to know how I should label the enclosure. Should I label it as shown in the original pedal design? Or in some other configuration?
Click to expand...
Sorry I can't help. I think I populated this board but all my builds have been paused for months with no sign of resuming soon.
 
OrganMeat said:
Should I label it as shown in the original pedal design? Or in some other configuration?
Click to expand...

The control layout is the same as the original and they behave the same.

The reason they seem to behave differently is because on the original pedal the LP and HP knobs are installed rotated 180 degrees on the pots compared to how you'd normally install knobs on a pedal. The pots themselves aren't oriented differently, the knobs are just on "upside down". The pots are at noon in the pic below.

1709354076398.png



If you want to install the knobs so they rotate in the typical fashion then you would simply rotate the frequency markings 180 degrees.
(Terrible hack photo)
1709353816111.png
 
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