High Pass Filter (HPF) and Low Pass Filter (LPF) Mega Thread

[Roxbororob]

All good fellas...

 

[MattiZ]

Just finished reading this thread, the whole of it. I want a HPF, badly.

Interested in DIY options, I found these. Does anybody have any experience with these kits/PCBs? There is very little info, just schematics, parts lists and wiring diagrams, somehow I suspect they’re not original desings but copies... of what?

SUBSONIC FILTER - GUITAR-ELECTRONICS.EU
HIGH PASS FILTER - GUITAR-ELECTRONICS.EU

 

[agedhorse]

I look

Just finished reading this thread, the whole of it. I want a HPF, badly.

Interested in DIY options, I found these. Does anybody have any experience with these kits/PCBs? There is very little info, just schematics, parts lists and wiring diagrams, somehow I suspect they’re not original desings but copies... of what?

SUBSONIC FILTER - GUITAR-ELECTRONICS.EU
HIGH PASS FILTER - GUITAR-ELECTRONICS.EU

I looked at one of their random schematic and it contained obvious errors.

 

[BklynKen]

I have a Broughton HPF on order and am still trying to figure out the best placement for it on this little board, right after the tuner or right before the preamp. I've heard everything from the beginning to the end to it doesn't matter.

 

[bassically_eli]

I have a Broughton HPF on order and am still trying to figure out the best placement for it on this little board, right after the tuner or right before the preamp. I've heard everything from the beginning to the end to it doesn't matter.


View attachment 4289035

I think it's pretty safe to say that the consensus is to put it at the beginning. There's no point in feeding those frequencies to your whole signal chain just to filter them out at the end. They won't add anything useful, and they may be detrimental. That said, right before or right after the tuner is totally fine. it's just a tuner after all.

 

[Zbysek]

I think it's pretty safe to say that the consensus is to put it at the beginning.

I don’t think there is a consensus.

Some players, including myself, place it at the end of the signal chain...

 

[shwashwa]

Since the f deck has a high impedance input I tend to place it first to take advantage of that. (It acts as a buffer)

 

[GwenOnBass]

In front of, or after, your DI is another consideration.

 

[dabis]

Just finished reading this thread, the whole of it. I want a HPF, badly.

Interested in DIY options...

VONG-Filterung – Schalltechnik_04

MINI-HP-VONG – Schalltechnik_04

 

[BklynKen]

I don’t think there is a consensus.

Some players, including myself, place it at the end of the signal chain...

I've seen that for players with a lot of pedals on their board, some of which could re-add unwanted low end. Mine is pretty simple.

 

[SoulReflection]

I've seen that for players with a lot of pedals on their board, some of which could re-add unwanted low end. Mine is pretty simple.

So is mine because DIY options would cost me more than this:

 

[Al Kraft]

My approach is to see what works best in each situation, but as a general rule I try to eliminate frequencies I do not want as early in the signal chain as possible. Some effects may be triggered more by certain frequencies or do some tone shaping (HPF/LPF kind of things) where it may be more desirable to feed a full range signal to that effect and then apply a HPF (if/as needed) afterwards.

 

[SoulReflection]

My approach is to see what works best in each situation, but as a general rule I try to eliminate frequencies I do not want as early in the signal chain as possible. Some effects may be triggered more by certain frequencies or do some tone shaping (HPF/LPF kind of things) where it may be more desirable to feed a full range signal to that effect and then apply a HPF (if/as needed) afterwards.

Agreed. Removing the unwanted/unnecessary is a good starting point...

 

[byacey]

Compression would likely be better after the HPF, so you aren't triggering the threshold with LF outside of the passband.

 

[JimmyM]

Compression would likely be better after the HPF, so you aren't triggering the threshold with LF outside of the passband.

Hmmm...I'll have to try it that way next time I plug in. Never really gave that much thought but I guess it makes sense.

 

[MattiZ]

I look

I looked at one of their random schematic and it contained obvious errors.

So, not recommended? Thanks, it seemed too good ( = too cheap) to be true.

VONG-Filterung – Schalltechnik_04

MINI-HP-VONG – Schalltechnik_04

I guess it is one of the Vongs then.

 

[6thplanet]

Just finished reading this thread, the whole of it. I want a HPF, badly.

Interested in DIY options, I found these. Does anybody have any experience with these kits/PCBs? There is very little info, just schematics, parts lists and wiring diagrams, somehow I suspect they’re not original desings but copies... of what?

SUBSONIC FILTER - GUITAR-ELECTRONICS.EU
HIGH PASS FILTER - GUITAR-ELECTRONICS.EU

I bought that kit and incorporated it into a blender pedal I built. Worked fine. I then modified the blender pedal schematic I used to have that feature built into it. I had some new PCB's made and have one assembled, but haven't made it into a pedal yet....honey do list and all....

 

[6thplanet]

New PCB:

That HP circuit is in the lower left, my blender PCB is the red one.

 

[beans-on-toast]

New PCB:
View attachment 4289496
That HP circuit is in the lower left, my blender PCB is the red one.
View attachment 4289495

Nice boards.

Over time I find that these type of sockets in gold

stand up better than this type on your blue board. The cost isn’t that much more for the better socket.

 

[krdp_nsk]

[QUOTE = "beans-on-toast, post: 25328798, member: 123838"] Хорошие форумы.

Со временем я обнаружил, что розетки этого типа в золоте

[ATTACH = полный] 4289497 [/ ATTACH]

встаньте лучше, чем этот тип, на синюю доску. Стоимость лучшей розетки не намного больше.
[ATTACH = полный] 4289498 [/ ATTACH] [/ QUOTE]

да, цанговые патроны лучше и надежнее